Готові списки джерел за темами / Novel Catalytic System

Добірка наукової літератури з теми "Novel Catalytic System"

Автор: Grafiati
Опубліковано: 18 травня 2024

Оформте джерело за APA, MLA, Chicago, Harvard та іншими стилями

Оберіть тип джерела:

Зміст

Ознайомтеся зі списками актуальних статей, книг, дисертацій, тез та інших наукових джерел на тему "Novel Catalytic System".

Біля кожної праці в переліку літератури доступна кнопка «Додати до бібліографії». Скористайтеся нею – і ми автоматично оформимо бібліографічне посилання на обрану працю в потрібному вам стилі цитування: APA, MLA, «Гарвард», «Чикаго», «Ванкувер» тощо.

Також ви можете завантажити повний текст наукової публікації у форматі «.pdf» та прочитати онлайн анотацію до роботи, якщо відповідні параметри наявні в метаданих.

Статті в журналах з теми "Novel Catalytic System"

1

Higuchi, Masayoshi, Isao Ikeda, and Toshikazu Hirao. "A Novel Synthetic Metal Catalytic System." Journal of Organic Chemistry 62, no. 4 (February 1997): 1072–78. http://dx.doi.org/10.1021/jo9617575.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Wang, Ziheng, Shumiao Lin, Qianqian Zhang, Jinlong Li, and Sheng Yin. "Construction of a Novel Lipase Catalytic System Based on Hybrid Membranes with Interwoven Electrospun Polyacrylic Acid and Polyvinyl Pyrrolidone Gel Fibers." Gels 8, no. 12 (December 10, 2022): 812. http://dx.doi.org/10.3390/gels8120812.

Повний текст джерела
Анотація:
Efficient lipase catalysis requires sufficient oil–water interface engineered through structural design. Inspired by the architectural features of fabrics, a novel lipase-membrane catalytic system with interwoven polyacrylic acid (PAA) gel fibers and polyvinyl pyrrolidone (PVP) gel fibers was developed in this study by using double-needle electrospinning and gelation. It has been demonstrated that PAA/PVP hybrid gel fiber membranes (HGFMs) have a high swelling capacity for both water and oil phases, which created numerous discontinuous oil–water contact surface units in limited space of HGFMs, consequently forming effective interfacial catalytic systems. Volume competition between the water and oil phases suggests that balancing the proportions of these phases is very important for effective construction of oil–water interfaces and conditioning catalysis. Regulation of multiple factors of PAA/PVP HGFMs resulted in a catalytic efficiency of up to 2.1 times that of a macroscopic “oil-up/water-down” system (room temperature, pH = 7), and 2.9 times when three membranes are superimposed, as well as excellent pH and temperature stability. HGFMs were stacked to build a high-performing catalytic performance reactor. We expect that this study will be a beneficial exploration for expanding the lipase catalytic system.
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Wang, Dabin, Weisong Yu, Bin Jiang, Tao Zeng, Dean Song, Song Fang, Yizhi Zhang, and Jiguang Zhang. "A Novel Chemiluminescent Method for Efficient Evaluation of Heterogeneous Fenton Catalysts Using Cigarette Tar." Toxics 11, no. 1 (December 29, 2022): 30. http://dx.doi.org/10.3390/toxics11010030.

Повний текст джерела
Анотація:
The evaluation of the catalytic capacity of catalysts is indispensable research, as catalytic capacity is a crucial factor to dictate the efficiency of heterogeneous Fenton catalysis. Herein, we obtained cigarette tar-methanol extracts (CTME) by applying methanol to cigarette tar and found that CTME could cause CL reactions with Fe2+/H2O2 systems in acidic, neutral, and alkaline media. The CL spectrum experiment indicated that the emission wavelengths of the CTME CL reaction with Fe2+/H2O2 systems were about 490 nm, 535 nm, and 590 nm. Quenching experiments confirmed that hydroxyl radicals (•OH) were responsible for the CL reaction for CTME. Then the CL property of CTME was applied in-situ to rapidly determine the amounts of •OH in tetrachloro-1,4-benzoquinone (TCBQ)/H2O2 system in acidic, neutral and alkaline media, and the CL intensities correlated the best (R2 = 0.99) with TCBQ concentrations. To demonstrate the utility of the CTME CL method, the catalytic capacity of different types and concentrations of catalysts in heterogeneous Fenton catalysis were examined. It was found that the order of CL intensities was consistent with the order of degradation efficiencies of Rhodamine B, indicating that this method could distinguish the catalytic capacity of catalysts. The CTME CL method could provide a convenient tool for the efficient evaluation of the catalytic capacity of catalysts in heterogeneous Fenton catalysis.
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Li, XiaoNian, and YiZhi Xiang. "A novel liquid system of catalytic hydrogenation." Science in China Series B: Chemistry 50, no. 6 (December 2007): 746–53. http://dx.doi.org/10.1007/s11426-007-0040-x.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

HIGUCHI, M., I. IKEDA, and T. HIRAO. "ChemInform Abstract: A Novel Synthetic Metal Catalytic System." ChemInform 28, no. 23 (August 3, 2010): no. http://dx.doi.org/10.1002/chin.199723034.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Dong, Zhe, Ziheng Cui, Jun Jin, Xinyi Cheng, Gangcheng Wu, Xingguo Wang, and Qingzhe Jin. "Enzymatic Synthesis of Structured Lipids Enriched with Medium- and Long-Chain Triacylglycerols via Pickering Emulsion-Assisted Interfacial Catalysis: A Preliminary Exploration." Molecules 29, no. 4 (February 19, 2024): 915. http://dx.doi.org/10.3390/molecules29040915.

Повний текст джерела
Анотація:
Medium- and long-chain triacylglycerol (MLCT), as a novel functional lipid, is valuable due to its special nutritional properties. Its low content in natural resources and inefficient synthesis during preparation have limited its practical applications. In this study, we developed an effective Pickering emulsion interfacial catalysis system (PE system) for the enzymatic synthesis of MLCT by trans-esterification. Lipase NS 40086 served simultaneously as a catalyst and a solid emulsifier to stabilize the Pickering emulsion. Benefitting from the sufficient oil–water interface, the obtained PE system exhibited outstanding catalytic efficiency, achieving 77.5% of MLCT content within 30 min, 26% higher than that of a water-free system. The Km value (0.259 mM) and activation energy (14.45 kJ mol−1) were 6.8-fold and 1.6-fold lower than those of the water-free system, respectively. The kinetic parameters as well as the molecular dynamics simulation and the tunnel analysis implied that the oil–water interface enhanced the binding between substrate and lipase and thus boosted catalytic efficiency. The conformational changes in the lipase were further explored by FT-IR. This method could give a novel strategy for enhancing lipase activity and the design of efficient catalytic systems to produce added-value lipids. This work will open a new methodology for the enzymatic synthesis of structured lipids.
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Zhao, Yu Liang, Lan Xiang Hou, Li Zhou, and Wen Zhi Zhang. "Synthesis of Novel Phosphite Ligands and their Application in Environmental Friendly Catalysis." Advanced Materials Research 955-959 (June 2014): 647–50. http://dx.doi.org/10.4028/www.scientific.net/amr.955-959.647.

Повний текст джерела
Анотація:
In this paper, propylene oxide has been first used to modify octylpolyglycol phenylene phosphite (OPGPP). A novel thermoregulated ligand OPGPP-Rh was synthesized for enlarging the application range of thermoregulated phase separable catalysis (TPSC) proposed by us. The ligands being studied have distinct critical solution temperature (CST) in some organic solvents. The CST of OPGPP (EO+PO=26+6) is 70°C in heptane. The authors further investigated the catalytic activity, separation and recycling efficiency of rhodium complex for hydroformylation of 1-octene in the catalytic system with CST. The optimal reaction conditions were as follows: T=100 °C, p=6.0MPa, CO:H2=1:1, reaction time of 5 hours, n (substrate to Rh)=1000, the solvent of heptane. Under the above conditions, the conversion of 1-octene and yield reached 90% and 88%, respectively. The catalyst could be recycled for five times without obvious loss in catalytic activity.
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Grishin, Ivan D., Elizaveta I. Zueva, Yulia S. Pronina, and Dmitry F. Grishin. "Novel Copper-Based Catalytic Systems for Atom Transfer Radical Polymerization of Acrylonitrile." Catalysts 13, no. 2 (February 18, 2023): 444. http://dx.doi.org/10.3390/catal13020444.

Повний текст джерела
Анотація:
Atom Transfer Radical Polymerization (ATRP) is an effective catalytic process leading to well-defined polymers with desired properties. This process based on reversible deactivation of propagating chains has a lower rate in comparison with conventional radical polymerization, especially in the case of obtaining polymers with high molecular weights. Thus, the increase of the rate of this process with preserving control over molecular weight distribution is a challenging task. In this work, novel catalytic systems for Activators Generated by Electron Transfer (AGET) ATRP of acrylonitrile based on copper (II) bromide complexes were proposed. It was found that Rochelle salt (potassium sodium tartrate tetrahydrate) may be used as a reducing agent for regeneration of copper-based catalysts to increase the rate of the process. The provided UV-vis spectroscopy experiments have confirmed the reducing ability of tartaric anion. It was found that the use tandem catalytic system based on two copper complexes with different ligands also increases the polymerization rate. The performed experiments allowed us to develop a catalytic system for rapidly obtaining polyacrylonitrile polymers with desired molecular weights exceeding 100 kDa.
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Fan, Wei, Wen-Zhen Wang, Li Wang, Xin-Gang Jia, Lei-Lei Li, Tian-Cun Xiao, and Peter P. Edwards. "Novel Cobalt Complex as an Efficient Catalyst for Converting CO2 into Cyclic Carbonates under Mild Conditions." Catalysts 9, no. 11 (November 14, 2019): 951. http://dx.doi.org/10.3390/catal9110951.

Повний текст джерела
Анотація:
Based on the ligand H2dpPzda (1), a novel cobalt complex [Co(H2dpPzda)(NCS)2]·CH3OH(2) has been synthesized and characterized. The Complex 2 exhibited excellent catalytic performance for converting CO2 into cyclic carbonates under mild conditions. For propylene oxide (PO) and CO2 synthesis of propylene carbonate (PC), the catalytic system showed a remarkable TOF as high as 29,200 h−1. The catalytic system also showed broad substrate scope of epoxide. Additionally, the catalyst could be recycled to maintain the integrity of the structure and remained equal to the level of its catalytic activity even after seven catalytic rounds. Additionally, a possible catalytic mechanism was proposed due to the high catalytic activity which might be owing to the synergism of Lewis acidic metal centers and N group.
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Gao, Ping, Xiang-Ying Sun, Bin Liu, Hui-Ting Lian, Xin-Qiang Liu, and Jiang-Shan Shen. "Cu MOF-based catalytic sensing for formaldehyde." Journal of Materials Chemistry C 6, no. 30 (2018): 8105–14. http://dx.doi.org/10.1039/c8tc01703d.

Повний текст джерела
Анотація:
Cu-BTC metal–organic frameworks possessing outstanding catalytic activity towards o-phenylenediamine were successfully synthesized to develop a novel catalytic sensing system for detecting gaseous formaldehyde.
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Дисертації з теми "Novel Catalytic System"

1

Basak, Puja. "Organic transformations using novel catalytic system." Thesis, University of North Bengal, 2022. http://ir.nbu.ac.in/handle/123456789/4790.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Quanson, Jonathan Luke. "The characterisation of the catalytic activity of human steroid 5α-reductase towards novel C19 substrates". Thesis, Stellenbosch : Stellenbosch University, 2015. http://hdl.handle.net/10019.1/97057.

Повний текст джерела
Анотація:
Thesis (MSc)--Stellenbosch University, 2015.
ENGLISH ABSTRACT: This study describes: • The UPLC-MS/MS analyses and quantification of novel 5α-reduced steroids using response factors. • The kinetic characterisation of human steroid 5α-reductase type 1 (SRD5A1), expressed in HEK-293 cells, towards 11OHA4 and 11OHT and their keto derivatives by progress curve analysis. • The subcloning, transformation and functional expression of SRD5A1 in the yeast expression system, P. pastoris. • The conversion of 11OHA4 and 11OHT and their keto derivatives by SRD5A1 expressed in P. pastoris. • The endogenous enzymatic activity in P. pastoris towards the 5α-reduced metabolites in the 11OHA4- and alternate 5α-dione pathways. • The potential application of P. pastoris as a biocatalyst in the production of 5α- reduced C19 steroids.
AFRIKAANSE OPSOMMING: Hierdie ondersoek beskryf: • Die UPLC-MS/MS analise en kwantifisering van nuut-ondekte 5α-gereduseerde steroïede met behulp van responsfaktore. • Die kinetiese karakterisering van menslike steroïed 5α-reduktase tipe 1 (SRD5A1), uitgedruk in HEK-293 selle, vir 11OHA4 en 11OHT en hul ketoderivate deur middel van progressiekurwe-analise. • Die subklonering, transformasie en funksionele uitdrukking van SRD5A1 in die gis P. pastoris. • Die omsetting van 11OHA4 en 11OHT en hul ketoderivate deur SRD5A1 uitgedruk in P. pastoris. • Die omsetting van 5α-gereduseerde steroïede in die 11OHA4 en alternatiewe 5α-dioon paaie deur endogene ensieme in P. pastoris • ‘n Ondersoek na die toepassing van die gisuitdrukkingstelsel as ‘n moontlike OR potensiële biokatalis vir die produksie van 5α-gereduseerde C19 steroïede.
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Paterson, Rachel. "A novel two-ligand system for investigation of signal integration by non-catalytic tyrosine-phosphorylated receptors." Thesis, University of Oxford, 2016. https://ora.ox.ac.uk/objects/uuid:910f605d-3d7e-4a2c-a33a-d380d9702029.

Повний текст джерела
Анотація:
Appropriate immune responses require integration of a variety of activating, coinhibitory, and co-stimulatory signals from cell surface receptors. One important class of immune receptors are the non-catalytic tyrosine-phosphorylated receptors (NTRs), a group of over 100 receptors, such as PD-1, CTLA-4, CD28, and the T and B cell antigen receptors. These receptors have a number of shared features that we propose have a functional significance, such as relatively small receptor-ligand dimensions and binding of surface-associated ligands. The mechanism through which NTR-ligand engagement leads to signal initiation and integration is not well understood and may offer novel targets for emerging immunotherapies, including checkpoint blockade therapies and adoptive cell transfer approaches such as the use of chimeric antigen receptors. We have developed a generic cellular two-ligand system to investigate signal integration between NTRs by manipulating their extra- and intra-cellular dimensions. We hypothesise that close co-localisation of receptors is important for optimal signal integration and that this requires compatible receptor-ligand dimensions. We also hypothesise that intracellular tail length influences the effectiveness of inhibitory NTRs by determining the “reach” of the tail and any effector molecules recruited to it. To manipulate the dimensions of receptor-ligand interactions, CHO.K1 cells ("ligand cells") were transfected with SpyTag constructs of different lengths and either CD48- or HLA-A2 single chain dimer-based constructs. SpyTag can be covalently coupled via SpyCatcher to StrepTactin, which binds to NTRs tagged with the short peptide tag Strep-tag II, such as the co-inhibitory receptor PD-1 studied here. Ligand cells expressing HLA-A2 SCD presenting cognate peptide or expressing CD48 can be used to provide activating signals through binding of the 1G4 TCR and a 2B4-CD64 fusion protein respectively, in THP-1 and Jurkat "receptor cells". CD48-based and SCD-based ligand cells were able to activate IL-8 production orupregulation of NF-{deletd} kB-eGFP gMFI by THP-1 receptor cells expressing 2B4-CD64 and Jurkat receptor cells expressing the 1G4 TCR, respectively. This activation of THP-1 and Jurkat receptor cells was partially inhibited by engagement of Strep-tag II-tagged PD-1 with the StrepTactin-based ligand coupled to CHO.K1 ligand cells, demonstrating PD-1-mediated inhibition in the two-ligand system. Experiments testing the study hypotheses have provided promising preliminary results, including that mismatching of receptor-ligand dimensions partially abrogates PD-1-mediated signalling and that the inhibitory function of PD-1 variants of different lengths is dependent on the presence of an immunoreceptor tyrosine-based switch motif (ITSM). Truncation of the PD-1 intracellular tail abolished PD-1-mediated inhibition, even in the presence of an ITSM. There was no evidence that elongation of the intracellular tail affected PD-1 inhibitory function using preliminary experimental conditions, although this result needs to be confirmed using alternative conditions such as lower ligand density. These experiments have provided several insights into areas for further development of the two-ligand system. Optimisation of some aspects of the system, such as improving coupling of the soluble StrepTactin-based ligand, increasing the StrepTactin-Strep-tag II affinity, and incorporating co-stimulatory signalling, should provide a suitable platform for studying signal integration between a wide range of NTRs of interest.
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Lu, Xun. "Exploration of novel carbon(II) and carbon(0) catalyst systems for organic synthesis." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/22939.

Повний текст джерела
Анотація:
This PhD thesis is focused on the development of novel carbon(II) and carbon(0) catalysis for organic synthesis. More specifically, the major objective has been to explore and design non-toxic and effective catalysts based on: an unusual Bertrand carbene type, a so-called bis(dialkylamino)cyclopropenylidene (BAC), and the carbodicarbene (CDC) framework; the central carbon atom in these molecules is in the formal low-oxidation state ‘+II’ and ‘0’, respectively. These species may be used in base catalysis or as ligands in metal catalysis, and in the context of frustrated Lewis pair (FLP) or dual catalysis. Prior to catalysis studies, the Lewis basicity of such carbon-based compounds has been assessed with 11B NMR analysis using various boron-based Lewis acids. Boron binding has been detected in all cases with a BAC, thereby confirming its strongly nucleophilic character and decreased steric demand. In contrast, only few ate complexes have been identified with CDCs (or precursors thereof), which means that CDCs may be more suitable for FLP catalysis. A preliminary electrophile binding study with a BAC has provided interesting data, based on which unprecedented aldimine Umpolung may be developed in the future. In the context of organocatalysis, BAC-mediated C–C bond formations between various Michael acceptors and N-tosyl imines have been developed (aza-Morita–Baylis–Hillman chemistry). In addition, C–N or C–Hal bond formations between various Michael acceptors and azodicarboxylates or electrophilic halogen reagents have been developed. The characteristic features of these unprecedented BAC catalyses include low catalyst loading, mild reaction conditions, and broad substrate scopes. Importantly, several novel chiral BACs have been synthesized and characterized, and excellent results have been achieved in BAC-catalysed asymmetric aza-MBH reactions (ee up to 97%). To the best of our knowledge, these data represent the first highly enantioselective BAC catalysis; chiral N-heterocyclic carbenes (NHCs) have proved to be substantially less effective in this context (ee up to 38%). In the same line, BAC-catalysed asymmetric borylations and silylations of Michael acceptors have been developed (preliminary ee up to 69%). These results demonstrate the high potential of the newly developed chiral BACs in asymmetric organocatalysis. Meanwhile, several BAC–gallium and BAC–iron complexes have been synthesized and characterized. These novel complexes may be used in Lewis acid catalysis after appropriate activation of the corresponding metal sites. Finally, the exploration of the catalysis potential of various C(0) compounds, namely CDCs, is still under investigation.
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Martinelli, Ada <1993&gt. "Novel catalytic systems and methidologies for organocatalysis and photocatalysis." Doctoral thesis, Alma Mater Studiorum - Università di Bologna, 2021. http://amsdottorato.unibo.it/9777/1/Martinelli_Ada_tesi.pdf.

Повний текст джерела
Анотація:
The thesis is divided into two main parts. In the first one organocatalysis is briefly introduced. Then, new enantiopure trityl pyrrolidines modified with an ionic tag are described. All the catalysts are tested in the benchmark Michael addition reaction to prove their activity and stereoselectivity. In the second part, photocatalysis is first introduced. Then, four different research projects are described. At first, the construction of a hybrid metal-organo-photoredox catalyst is described. The hybrid photocatalysts obtained were employed in the benchmark photoredox alkylation of aldehydes. Then, the use of visible light and a photocatalytic system for the cyclization of iodoaryl vinyl derivatives to tetrahydroquinoline structures is described. In addition, the reaction can also be performed using flow-chemistry. Finally, a mechanistic proposal based on some mechanistic studies is described. Third, a new photoredox catalyzed transformation for the synthesis of 2,3-dihydrofurans is reported. Depending on the involved starting materials, different pathways have arisen. A mechanistic proposal based on reported literatures and experimental data is described. At last, a new photoredox catalyzed transformation for the synthesis of 2-aminofurans is described. Electrophilic radical addition on allenamides and subsequential intramolecular cyclization are exploited. The reaction proceeds under very mild conditions and in 2-aminofurans are obtained in good to high yield. It represents one of the few applications of allenamides in photoredox catalysis. A mechanistic proposal is described. Finally, preliminary investigations on the applicability of the developed transformation under flow chemistry conditions.
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Cubbon, Rachel Jane. "Novel nitrogen-phosphorus ligands for asymmetric catalysis." Thesis, University of Sheffield, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.310817.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Perperi, Evangelia. "A novel continuous homogeneous catalytic process for flourous biphasic systems." Thesis, University College London (University of London), 2004. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412909.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Schettini, Rosaria. "Novel macrocyclic systems in asymmetric phase-transfer catalysis." Doctoral thesis, Universita degli studi di Salerno, 2017. http://hdl.handle.net/10556/2422.

Повний текст джерела
Анотація:
2014 - 2015
In the great realm of organic synthesis, phase-transfer catalysis (PTC) is a well recognized methodology which plays a key role both in industry and academia research. This process involves reactions that take place between reagents which are located in different phases, for example an inorganic water-soluble reagent and a substrate soluble in the organic phase. Considering the well-defined advantages of asymmetric phase-transfer catalysis as a powerful method for organic synthesis, the aim of this research project is to introduce novel macrocycle systems as new and efficient catalysts in this field. First of all, considering the advantages of the easy synthetic process for the preparation of cyclopeptoids, their well-explored complexation properties and the preliminary study on the application as phase-transfer catalysts, the idea is to deeply investigate their use in PTC. The advantages of the solid phase synthesis, such as the easy purification of the intermediates and the modular nature of the products, make cyclopeptoids ideal candidates for the discovery of new catalytic systems, as it is possible to incorporate a wide variety of functionalities inside the backbone of the macrocycle in an expeditious way. As a consequence, a library of peptoid-based chiral macrocycles of different size, decorated with alternating residues of L-Proline and different aromatic side chains, will be prepared and used for enantioselective alkylation reactions. The scope of this project extends also to the investigation of novel chiral calixarenes. However, in this case, the idea is to exploit the ability of calixarenes to form host-guest complexes with alkali cations. The study is also devoted to further explore the potential of crown ethers in new catalytic processes. The second chapter focus first on the synthesis of novel chiral cyclopeptoids and then on their application in asymmetric phase-transfer alkylations, in particular for the enantioselective synthesis of α-amino acids. Afterwards the application of new designed calixarenes for the same alkylation reaction is described. Finally the application of cyclopeptoidic systems in the enantioselective alkylation of 2-aryl-oxazoline-4 carboxylic acid esters is discussed. The third chapter describes the application of crown ethers in phase-transfer processes. For this purpose a diasteroselective methodology for the synthesis of γ-substituted butenolides by a direct vinylogous Mukayama-Michael reaction has been developed. [edited by author]
L’attività di ricerca svolta dalla Dr.ssa Schettini Rosaria ha riguardato la sintesi e l’applicazione di nuovi sistemi macrociclici nella catalisi asimmetrica a trasferimento di fase. In particolare, il progetto di dottorato è stato incentrato sulla sintesi di nuovi sistemi chirali di natura ciclopeptoidica impiegati come catalizzatori nel campo asimmetrico. Nel corso del dottorato nuovi sistemi calixarenici chirali sono stati impiegati nel medesimo campo. L’ultima parte del progetto ha riguardato l’impiego di catalizzatori facilmente reperibili in commercio, gli eteri corna. Essi sono stati impiegati con successo in una reazione altamente diastereoselettiva. Durante il corso di dottorato, la dott.ssa Schettini Rosara ha seguito costantemente le attività didattiche previste nel progetto. [a cura dell'autore]
XIV n.s.
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Hardacre, Christopher. "Surface chemistry and catalysis of novel Pt/CeO←2 systems." Thesis, University of Cambridge, 1993. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.282862.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Al-Harrasi, Wail Saif Salim. "Novel plasma catalytic systems for Fischer-Tropsch reactions : intensified gas-to-liquid fuel production." Thesis, University of Newcastle Upon Tyne, 2011. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.578549.

Повний текст джерела
Анотація:
One of the impacts of climate change is the emergence of food, energy and water shortages which can be circumvented through intensified technologies in agriculture, energy and chemical/biological processes. Furthermore, depleting fossil fuel reserves requires the establishment of alternative sustainable energy resources. Biomass based energy and chemicals technology is an important component of sustainable development which can be integrated with food and water generation. However, due to distributed nature of biomass, biomass based energy technology needs to be distributed generation which would benefit from low temperature and pressure operation. Syngas produced from gasification of waste/biomass can be. converted to power or liquid fuel after cleaning. Although process intensification (PI) is still in its infancy, potentially, it is highly suitable for the distributed production of power and liquid fuels. The objective of this study is to develop a syngas-to-liquid fuel conversion process suitable for distributed production using principles of PI through the intensification of Fischer Tropsch Synthesis (FTS). The first approach was by using structured catalysts in monolithic forms for FTS. The second approach was to couple the structured catalyst with non thermal plasma by using dielectric barrier discharge (DBD) in hybrid FTS reactors. A hybrid reactor was designed and fabricated to test this novel catalytic system. Co and Co/Cu catalysts were prepared and characterised using scanning electron microscopy, energy dispersive X-ray spectroscopy, X-ray diffraction and transmission electron microscopy. The reactor was used in the FTS using H, and CO under various processing conditions (temperature, pressure, Hz/CO molar ratio, gas flowrate and plasma power) and the products were analysed using gas chromatography. It is shown that Co/Cu catalyst in plasma assisted FTS was feasible, converting up to 38% of CO at 90W, 1 bar, Hz/CO= 2, 25ml/min and 25°C. This conversion was obtained at 230°C and 6 bar in conventional FTS. This research showed that DBD in FTS enables running the reaction at room temperature and atmospheric pressure avoiding the risks and costs associated with high pressure processes. It was also shown that plasma affected the activity of the catalysts, preventing it from agglomeration.
Стилі APA, Harvard, Vancouver, ISO та ін.
Більше джерел

Книги з теми "Novel Catalytic System"

1

1945-, İmamoğlu Yavuz, and Bencze L, eds. Novel metathesis chemistry: Well-defined initiator systems for specialty chemical synthesis, tailored polymers, and advanced material applications. Dordrecht: Kluwer Academic Publishers, 2003.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

(Editor), Y. Imamoglu, and L. Bencze (Editor), eds. Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced Material Applications (NATO ... II: Mathematics, Physics and Chemistry). Springer, 2003.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

(Editor), Y. Imamoglu, and L. Bencze (Editor), eds. Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced Material Applications (NATO ... II: Mathematics, Physics and Chemistry). Springer, 2003.

Знайти повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Частини книг з теми "Novel Catalytic System"

1

Catellani, Marta. "Novel Methods of Aromatic Functionalization Using Palladium and Norbornene as a Unique Catalytic System." In Topics in Organometallic Chemistry, 21–53. Berlin, Heidelberg: Springer Berlin Heidelberg, 2005. http://dx.doi.org/10.1007/b104126.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Nikolla, Eranda, and Suljo Linic. "From Molecular Insights to Novel Catalysts Formulation." In Model Systems in Catalysis, 275–92. New York, NY: Springer New York, 2009. http://dx.doi.org/10.1007/978-0-387-98049-2_13.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Webb, Paul B., and David J. Cole Hamilton. "The Design of Ligand Systems for Immobilisation in Novel Reaction Media." In Phosphorus(III) Ligands in Homogeneous Catalysis: Design and Synthesis, 497–532. Chichester, UK: John Wiley & Sons, Ltd, 2012. http://dx.doi.org/10.1002/9781118299715.ch18.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Szymańska-Buzar, T. "Catalytic Activity of W-Sn and Mo-Sn Bimetallic Compounds in Metathesis and Related Reactions." In Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced Material Applications, 121–29. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0066-6_9.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Bencze, L., and L. Mihichuk. "Catalytic Properties and Chemical Transformations of CIS-W(CO)4(C5H5N)2 Initiator in Ring Opening Metathesis Polymerization." In Novel Metathesis Chemistry: Well-Defined Initiator Systems for Specialty Chemical Synthesis, Tailored Polymers and Advanced Material Applications, 65–71. Dordrecht: Springer Netherlands, 2003. http://dx.doi.org/10.1007/978-94-010-0066-6_5.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Hermans, Ive, Eric Breynaert, Jozef Peeters, André Maes, and Pierre A. Jacobs. "Designing a Novel Heterogeneous Catalytic System for Cyclohexane Autoxidation." In Science and Technology in Catalysis 2006, 373–76. Elsevier, 2007. http://dx.doi.org/10.1016/b978-0-444-53202-2.50082-8.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Galloni, M. G., H. M. Adeel Sharif, A. Grainca, M. Rizwan Haider, and R. Djellabi. "Magnetic Adsorbents/Photocatalysts for Water Purification: Progress and Challenges." In Novel Materials and Water Purification, 78–100. Royal Society of Chemistry, 2024. http://dx.doi.org/10.1039/9781837671663-00078.

Повний текст джерела
Анотація:
Photocatalysis requires the activation of photocatalytic materials by light to produce a redox system able to oxidize/reduce (in)organic pollutants. Photocatalysts in suspension form provide excellent oxidation of pollutants in water due to excellent mass transfer. However, the recovery of photocatalyst particles is challenging and costly at large scale. To solve this, numerous studies on the immobilization of photocatalysts on substrates have been reported, to avoid treatment steps or/and for better recovery of particles. This approach suffers from slow kinetics due to less mass transfer, and is not competitive with existing technologies. Magnetically recoverable photocatalysts for water treatment are innovative materials that can be used for high efficiency and ease of handling: they can be used as suspensions, ensuring maximum mass transfer, and recovered by external magnetic force. This chapter aims to discuss recent progress in the design and application of magnetic-based materials for water treatment. Their synthesis and performance in water treatment are clarified. Their catalytic role to catalyse Fenton agents and NaBH4 for organic pollutant oxidation is addressed. In addition, their photocatalytic mechanistic pathways and (photo)catalytic role are discussed. Since magnetic materials exhibit low stability and high charge, recombination as magnetic nanoparticles that can play the roles of recombination center and insulator are discussed, emphasizing the mechanisms and synthesis conditions.
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Takehira, K., M. Shimizu, Y. Watanabe, T. Hayakawa, and H. Orita. "Novel Oxidation of Phenols by a Copper(II) Complex Catalyst/O2 System." In Dioxygen Activation and Homogeneous Catalytic Oxidation, Proceedings of the Fourth International Symposium on Dioxygen Activation and Homogeneous Catalytic Oxidation, 279–84. Elsevier, 1991. http://dx.doi.org/10.1016/s0167-2991(08)62843-8.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Mukouyama, Masaharu, and Shinzo Yasuda. "148 Novel L-aspartic acid production system using an immobilized cell catalyst." In Science and Technology in Catalysis 2002, Proceedings of the Fourth Tokyo conference on Advance Catalytic Science and Technology, 553–54. Elsevier, 2003. http://dx.doi.org/10.1016/s0167-2991(03)80305-1.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Okachi, Takahiro, and Makoto Onaka. "23 A novel promotion system for carbonyl-ene reactions of styrenes with paraformaldehyde —The combined use of boron trifluoride and molecular sieves." In Science and Technology in Catalysis 2002, Proceedings of the Fourth Tokyo conference on Advance Catalytic Science and Technology, 141–44. Elsevier, 2003. http://dx.doi.org/10.1016/s0167-2991(03)80180-5.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.

Тези доповідей конференцій з теми "Novel Catalytic System"

1

O’Brien, Christopher, Michael Leshchiner, and Todd M. Ryan. "Design and Demonstration of a Multi-Fuel Automotive Fuel Processor With Novel Catalyst Integration and Rapid Control System." In ASME 2008 6th International Conference on Fuel Cell Science, Engineering and Technology. ASMEDC, 2008. http://dx.doi.org/10.1115/fuelcell2008-65238.

Повний текст джерела
Анотація:
A complete automotive onboard multi-fuel fuel processing system (FPS) that addresses some of the key issues of catalyst utilization, fuel cell integration, and control has been developed and tested, producing up to 1.2 grams per second of hydrogen flow in a total package volume of 150 liters. The reforming reaction train includes an autothermal reforming (ATR) zone, water-gas shift (WGS), and preferential oxidation (PrOx), all integrated with heat exchange to preheat reactants and generate process steam. The WGS and PrOx catalysts are integrated on metallic supports within a novel modular catalyst coated heat exchanger design that incorporates catalytic reaction, air preheat, and steam generation in a single device. The use of the catalyst coated heat exchangers eliminates the need for separate high-temperature shift and low-temperature shift zones; these are replaced by a continuously cooled single WGS zone. Due to the novel integration of catalytic heat exchangers, this FPS uses approximately half the catalyst per unit hydrogen produced than the previous generation, allowing for significant cost reduction.
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Schmitz, I., V. Scherer, S. Wirtz, and R. Carroni. "CFD Based Development of a Fuel-Air Premixer for a Retrofittable Catalytic Combustion System." In ASME Turbo Expo 2007: Power for Land, Sea, and Air. ASMEDC, 2007. http://dx.doi.org/10.1115/gt2007-27326.

Повний текст джерела
Анотація:
The development of a novel, hybrid catalytic combustor compatible with current and future gas turbine requirements is the goal of the EU project CATHLEAN. One main prerequisite for the operability of this catalytic combustor is the provision of a homogenous mixture of fuel and air at the entrance of the catalyst. A novel mixer unit consisting of a fuel injection, a large scale turbulence generator and a fine scale mixer should fulfil this requirement. Furthermore, a specific flow-correcting geometry promotes a near-uniform velocity distribution at the catalyst inlet. The present paper describes the computational development process of the fuel injection and the large scale turbulence generator. Detailed 3-D CFD studies using RANS models were carried out. The following optimisation steps have been performed: • fuel injection optimisation; • basic large scale turbulence generator development and optimisation; • detailed analysis of the final mixing section design (combination of fuel injection and large scale turbulence generator in a common mixing section). The results will be presented in light of the main design parameters: optimum mixing quality, minimized pressure loss and avoiding ignition of the fuel within the mixing device.
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Dutta, P., D. K. Yee, and R. A. Dalla Betta. "Catalytic Combustor Development for Ultra-Low Emissions Industrial Gas Turbines." In ASME 1997 International Gas Turbine and Aeroengine Congress and Exhibition. American Society of Mechanical Engineers, 1997. http://dx.doi.org/10.1115/97-gt-497.

Повний текст джерела
Анотація:
The goal of the Advanced Turbine Systems (ATS) program is to develop a high thermal efficiency industrial gas turbine with ultra-low emissions (<10 ppmv NOx, CO and UHC @ 15% O2) over the 50 to 100% load range. Catalytic combustion was chosen as an approach likely to meet ATS emissions goals. A subscale catalytic combustor development program was designed to develop a technical knowledge base for catalyst design (catalyst construction, length), performance (ignition, activity and emissions) and operating limitations (fuel-air turndown and sensitivity to combustor operating variables). A novel catalyst design with preferential catalyst coating to limit substrate temperatures was used in the tests. The catalytic combustor consists of a fuel-air premixer, catalytic reactor and a post-catalyst zone for completion of homogeneous gas phase reactions. In situ measurements of mean fuel concentrations at the exit of the premixer were completed to characterize fuel-air premixing levels. Performance of the catalyst was monitored through global emissions measurements at the exit of the post-catalyst combustor under simulated engine conditions, and measurement of catalyst substrate temperatures. Ultra-low emissions were achieved for relatively uniform fuel-air premixing (<10% peak to peak variation in fuel concentration) with higher inhomogeneities (>10% peak to peak variation) leading to either locally high or low substrate temperatures. Regions with low substrate temperatures led to high CO and UHC emissions. Modeling of post-catalyst homogeneous reactions using a standard stationary, one-dimensional, laminar premixed flame formulation showed good agreement with measurements. In short term tests, the catalysts showed the desired chemical activity and ability for multiple light-off. The subscale combustor development work provided the necessary technical information for full scale catalytic combustion system development for the ATS gas turbine.
Стилі APA, Harvard, Vancouver, ISO та ін.
4

Mehmonov, Kamoliddin. "THE EFFECT OF OXYGEN IN THE CATALYTIC SYNTHESIS OF ENDOHEDRAL CARBYNE." In Proceedings of MMIT’23 International Conference 25 May 2023y. Tashkent International University of Education, 2023. http://dx.doi.org/10.61587/mmit.uz.vi.49.

Повний текст джерела
Анотація:
Carbyne, a novel carbon nanostructure, has drawn considerable attention in modern nanotechnology due to its unique physical properties. Despite the successful synthesis of carbyne through various methods, the mechanisms behind carbon monoxide-dependent catalytic synthesis of endohedral carbyne remain poorly understood. In this simulation-based study, we investigate the synthesis of endohedral carbyne dependent on C and CO radicals in the presence of a Ni5 catalyst inside double-walled carbon nanotubes of (5,5)@(10,10) structure. Our results show that the introduction of the C atom leads to the formation of a long carbon chain within the Ni5@(5,5)@(10,10) model system. In contrast, in the case of CO radicals, the carbyne chain growth is hindered due to the oxidation of nickel clusters by oxygen atoms after the initial nucleation stage. Our findings are consistent with previous theoretical, simulation, and experimental studies, and offer valuable insights into the synthesis of carbyne-based nanodevices for future nanotechnology.
Стилі APA, Harvard, Vancouver, ISO та ін.
5

Neylon, Michael K., Mario J. Castagnola, A. Jeremy Kropf, and Christopher L. Marshall. "Bifunctional Catalysts for the Selective Catalytic Reduction of NO by Hydrocarbons." In ASME 2004 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/icef2004-0902.

Повний текст джерела
Анотація:
Novel bifunctional catalysts combining two active phases, typically Cu-ZSM-5 and a modifier, were prepared and tested for the selective catalytic reduction of nitrogen oxides using propylene in order to overcome the hindering effects of water typically seen for single-phase catalysts such as Cu-ZSM-5. The catalysts were made by typical preparation techniques, but parameters could be varied to influence the catalyst. The physical characterization of the materials showed that the modification phase was added strictly to the external surface of the zeolite without hindering any internal surface area. Chemical characterization by temperature-programmed reactions, DRIFTS and x-ray absorption spectroscopy indicated strong interaction between the two phases, primarily producing materials that exhibited lower reduction temperatures. Two improvements in NOx reduction activity (1000 ppm NO, 1000 ppm C3H6, 2% O2, 30,000 hr−1 GHSV) were seen for these catalysts compared with Cu-ZSM-5: a lower temperature of maximum NOx conversion activity (as low at 250°C), and an enhancement of activity when water was present in the system. The use of a second phase provides a way to furthure tune the properties of the catalyst in order to achieve mechanistic conditions necessary to maximize NOx remediation.
Стилі APA, Harvard, Vancouver, ISO та ін.
6

Damm, David L., and Andrei G. Fedorov. "Forced Unsteady-State Variable Volume Membrane Reactor: New Scalable Technology for Distributed Hydrogen Production." In ASME 2008 3rd Energy Nanotechnology International Conference collocated with the Heat Transfer, Fluids Engineering, and Energy Sustainability Conferences. ASMEDC, 2008. http://dx.doi.org/10.1115/enic2008-53002.

Повний текст джерела
Анотація:
Technology for large scale catalytic hydrogen generation from hydrocarbons is quite mature and most reactors are of the fixed catalyst bed-type operated in a steady-state, continuous-flow (CF) regime. However, simple miniaturization of these reactors for portable and distributed applications has proven difficult because of 1) the poor process scale-down, 2) sequential uni-functional design not suitable for miniaturization and system integration, and 3) poor reaction yields due to fundamental mismatch between the time scales of the catalytic chemistry and the transport processes. To address these concerns, we have developed a novel reactor concept which is well suited to be an integral part of onboard fuel processing for the next generation of automobile power plants (or any other small-scale distributed application).
Стилі APA, Harvard, Vancouver, ISO та ін.
7

Mandloi, Deepak, Prachi Sahu, Monika Jayprakash Bagade, and Himadri Das. "Model-Free State Estimation Using Subspace Identification and Kalman Filter." In WCX SAE World Congress Experience. 400 Commonwealth Drive, Warrendale, PA, United States: SAE International, 2023. http://dx.doi.org/10.4271/2023-01-0365.

Повний текст джерела
Анотація:
<div class="section abstract"><div class="htmlview paragraph">The model-based design is very much prominent in the vehicle level control system design and state estimation algorithms. It gives the edge to understand and interpret the dynamic systems. Three-way catalytic converter is a thermo-chemical device to convert the toxic oxides into carbon dioxide and water vapor, during this conversion reactions it generates the heat over the catalyst surface. Detailed chemical and thermal model of the catalyst will be able to predict the conversion efficiency, state of stored oxygen <i>(SoX)</i> and oxygen storage capacity <i>(OSC)</i>. As the catalyst get aged, the reaction rates of conversion reactions deteriorate, in results the temperature dynamics also varies which wanes the exothermic heat. In this work, a novel perspective is presented to capture the behavior of <i>SoX</i> and health of the catalytic converter using thermal model analysis of TWC. An equivalent second order multi input single output (MISO) linear sub-space model is identified for the complex detailed thermal model. A second order MISO system is obtained using measured temperature sensor signals across the device. Recursive least square method will be updating the system parameters online then Kalman filter is employed for state estimation. Joint estimation of the hidden state is tested and validated on urban drive cycle with differently aged catalytic converters.</div></div>
Стилі APA, Harvard, Vancouver, ISO та ін.
8

Hack, R. L., V. G. McDonell, G. S. Samuelsen, J. Blust, P. Dutta, K. Smith, and D. Yee. "Design and Testing of a Unique, Compact Gas Turbine Catalytic Combustor Premixer." In ASME Turbo Expo 2003, collocated with the 2003 International Joint Power Generation Conference. ASMEDC, 2003. http://dx.doi.org/10.1115/gt2003-38778.

Повний текст джерела
Анотація:
Catalytic combustion systems represent a potentially significant technology development in low-NOx gas turbine technology. The challenges associated with the implementation of catalytic combustion in a gas turbine include the need to present both a uniform fuel/air mixture as well as a uniform approach velocity to the catalyst within a minimal volume. The effort described herein addresses the design of catalytic combustor premixer for use on a small frame industrial (5 MW) stationary gas turbine. The general requirements for the premixer were to provide velocity and fuel air mixture uniformity at the exit plane of ±10% of the mean and ±3% of the mean respectively at nominal idle and full load conditions while maintaining a pressure drop of 4% maximum. The target turbine’s packaging and air-flow path presented an additional challenge requiring the flow to make a 180 degree flow reversal immediately upstream of the combustor. Computational fluid dynamics modeling was utilized to iterate the mixer design. A unique solution was obtained utilizing an involute shaped contraction/throat/expansion scheme. The most promising design was fabricated and tested at atmospheric conditions. As compared to a “baseline” mixer, the final involute design improved upon the flow mixing and velocity uniformity. The novel premixer design also eliminated the use of fuel injection spokes and static mixers, relying upon fuel injection from the wall and a high turbulent kinetic energy (TKE) throat section to provide the mixing, thereby simplify manufacturing. To test both scaling issues in the mixer and to provide an opportunity to test the design at high pressure, a 25% scale (approximate) reduced size mixer was designed and fabricated. Subsequent atmospheric and elevated pressure (11 atm, 1110 kPa) testing confirmed that the mixture uniformity was maintained and the general concept was applicable at both a reduced scale and at elevated pressures. Finally the premixer was integrated with a catalyst and fueled to confirm the overall system performance. The emissions of NOx were <1ppm.
Стилі APA, Harvard, Vancouver, ISO та ін.
9

Griffin, Timothy, Dieter Winkler, Markus Wolf, Christoph Appel, and John Mantzaras. "Staged Catalytic Combustion Method for the Advanced Zero Emissions Gas Turbine Power Plant." In ASME Turbo Expo 2004: Power for Land, Sea, and Air. ASMEDC, 2004. http://dx.doi.org/10.1115/gt2004-54101.

Повний текст джерела
Анотація:
The AZEP (Advanced Zero Emissions Power Plant) project addresses the development of a novel “zero emissions,” gas turbine-based, power generation process to reduce CO2 emissions. Preliminary calculations indicate the attractiveness of this concept in comparison to conventional tail-end CO2 capture. Key to achieving the AZEP project targets is the development of a combustion system to burn natural gas with nearly stoichiometric amounts of oxygen and high levels of exhaust gas dilution. Within the first part of this study the fundamental combustion properties of AZEP gas mixtures are quantitatively determined. Significant inhibition results from the high level of exhaust gas dilution. In the second part a staged, rich–lean combustion concept, proposed to improve combustion stability, is investigated. It was shown that significant levels of hydrogen could be produced by a first stage, partial catalytic oxidation (PCO) of methane. Furthermore, it is shown that the addition of this produced hydrogen improves the stability of the downstream, second stage burnout zone. It was demonstrated that the produced syngas could act to reduce the blowout limit by ca. 100 K as compared to homogeneous gas phase combustion.
Стилі APA, Harvard, Vancouver, ISO та ін.
10

Lin, Qinghua, Pingen Chen, Vitaly Y. Prikhodko, and James E. Parks. "Configuration and Control Design for a Passive SCR System With NOx Storage Capability." In ASME 2018 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/dscc2018-9241.

Повний текст джерела
Анотація:
Passive selective catalytic reduction (SCR) systems have been considered as a promising technology for reducing NOx emissions for highly-efficient lean burn gasoline engines. Since passive SCR requires intermittent rich operation for self-generating ammonia (NH3) for NOx reduction in the lean phase, the fuel penalty associated with NH3 generation may be significant. To address this issue, a new prototype passive SCR system with NOx storage capability was recently investigated. The three-way catalyst (TWC) with added NOx storage capability is able to enhance NH3 production rate by utilizing pre-stored NOx and thus reduce the fuel cost related to NH3 production. The main purpose of this study is to reduce the ammonia generation cost by: 1) proposing a new passive SCR system architecture that includes two TWC stages; and 2) developing and optimizing a novel non-uniform cylinder-to-cylinder combustion (NUCCC) control. Optimization results based on the experimental data from a physical engine platform, demonstrate that the new passive SCR system (with NOx storage components on TWCs), in conjunction with optimized NUCCC control, is capable of reducing ammonia specific fuel consumption (ASFC) by 30.2%, when compared to a uniform cylinder-to-cylinder combustion (UCCC)-controlled baseline passive SCR system. Such a novel NUCCC control and innovative passive SCR configuration, will be very instrumental in creating cost-effective lean NOx emission control solutions for lean-burn engines in the future.
Стилі APA, Harvard, Vancouver, ISO та ін.

Звіти організацій з теми "Novel Catalytic System"

1

Stankovic, Sasa. Novel Applications of the Methyltrioxorhenium/Hydrogen Peroxide Catalytic System. Office of Scientific and Technical Information (OSTI), September 2000. http://dx.doi.org/10.2172/764687.

Повний текст джерела
Стилі APA, Harvard, Vancouver, ISO та ін.
2

Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova, and Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, January 2016. http://dx.doi.org/10.32747/2016.7604286.bard.

Повний текст джерела
Анотація:
The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.
Стилі APA, Harvard, Vancouver, ISO та ін.
3

Schaffer, Arthur, Jack Preiss, Marina Petreikov, and Ilan Levin. Increasing Starch Accumulation via Genetic Modification of the ADP-glucose Pyrophosphorylase. United States Department of Agriculture, October 2009. http://dx.doi.org/10.32747/2009.7591740.bard.

Повний текст джерела
Анотація:
The overall objective of the research project was to utilize biochemical insights together with both classical and molecular genetic strategies to improve tomato starch accumulation. The proposal was based on the observation that the transient starch accumulation in the immature fruit serves as a reservoir for carbohydrate and soluble sugar content in the mature fruit, thereby impacting on fruit quality. The general objectives were to optimize AGPase function and activity in developing fruit in order to increase its transient starch levels. The specific research objectives were to: a) perform directed molecular evolution of the limiting enzyme of starch synthesis, AGPase, focussing on the interaction of its regulatory and catalytic subunits; b) determine the mode of action of the recently identified allelic variant for the regulatory subunit in tomato fruit that leads to increased AGPase activity and hence starch content. During the course of the research project major advances were made in understanding the interaction of the small and large subunits of AGPase, in particular the regulatory roles of the different large subunits, in determining starch synthesis. The research was performed using various experimental systems, including bacteria and Arabidopsis, potato and tomato, allowing for broad and meaningful conclusions to be drawn. A novel discovery was that one of the large subunits of tomato AGPase is functional as a monomer. A dozen publications describing the research were published in leading biochemical and horticultural journals. The research results clearly indicated that increasing AGPase activity temporally in the developing fruit increase the starch reservoir and, subsequently, the fruit sugar content. This was shown by a comparison of the carbohydrate balance in near-isogenic tomato lines differing in a gene encoding for the fruit-specific large subunit (LS1). The research also revealed that the increase in AGPase activity is due to a temporal extension of LS1 gene expression in the developing fruit which in turn stabilizes the limiting heterotetrameric enzyme, leading to sustained starch synthesis. This genetic variation can successfully be utilized in the breeding of high quality tomatoes.
Стилі APA, Harvard, Vancouver, ISO та ін.
Також вас можуть зацікавити розширені добірки на тему "Novel Catalytic System" для конкретних типів джерел:
Статті в журналах Дисертації
Ми пропонуємо знижки на всі преміум-плани для авторів, чиї праці увійшли до тематичних добірок літератури. Зв'яжіться з нами, щоб отримати унікальний промокод!

До бібліографії