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Articles de revues sur le sujet « Novel Catalytic System »

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Auteur : Grafiati
Publié le 18 mai 2024

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1

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

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2

Wang, Ziheng, Shumiao Lin, Qianqian Zhang, Jinlong Li et 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 (10 décembre 2022) : 812. http://dx.doi.org/10.3390/gels8120812.

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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.
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3

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

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

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5

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

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6

Dong, Zhe, Ziheng Cui, Jun Jin, Xinyi Cheng, Gangcheng Wu, Xingguo Wang et 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 (19 février 2024) : 915. http://dx.doi.org/10.3390/molecules29040915.

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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.
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7

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

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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.
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8

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

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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.
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9

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

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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.
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10

Gao, Ping, Xiang-Ying Sun, Bin Liu, Hui-Ting Lian, Xin-Qiang Liu et 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.

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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.
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11

Wang, Ke Ping, Song Bai Lin, Na Na Wang et Ai Ru Ke. « A Novel Gold Nanoparticle/Poly(AMPS-co-HEMA) Composite Hydrogel for Selective Catalysis ». Advanced Materials Research 399-401 (novembre 2011) : 704–7. http://dx.doi.org/10.4028/www.scientific.net/amr.399-401.704.

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A modified seed-mediated growth method was developed for in situ controllable preparation of gold nanoparticles (GNPs) within P(AMPS-co-HEMA) hydrogel networks. When the time of cycles absorbing procedure increased in mother solutions under given temperature during the processing stage, the number of GNPs was significantly increased and networks were utilized for in situ nanoparticles synthesis by reduction of glod ion absorbed. TEM images confirmed that GNPs were between 100 and 200 nm in size and distributed uniformly in gel. The network embedded GNPs also endows the composite gel with selective catalytic activity for selective catalysis in the reduction of nitro compound (2-NP, 3-NP and 4-NP). The kinetics of the reduction reaction were investigated under the same condition, the result showed the GNPs gel system was found to have an excellent catalytic activity and high conversion for 4-NP reduction among nitrophenol homologue, the nitrophenol hydrogenation rate got to 6.63 mol/g min for reducing of 4-NP compared to 3.69 mol/g min, the rate of 2-NP. It was almost zero for 3-NP implying no catalytic activity, even though they were isomeride.
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12

Dangtungee, Rapeephun, Suchart Siengchin et Chaisiri Kitpaosong. « Novel Method for Recycle Epoxy Resin from Waste Printed Circuit Board ». Advanced Materials Research 931-932 (mai 2014) : 90–94. http://dx.doi.org/10.4028/www.scientific.net/amr.931-932.90.

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This research was aimed to study and develop a method for recycle epoxy resin from waste printed circuit board by hot solvent methods and DMSO/NaOH catalytic extraction method. It was found that the pressure tank system, sub set of hot solvent method, variable as following; pressure of 15 bar, temperature of 80 °C, reaction time for 6 h and ethyl acetate solvent presented maximum yield 50.46 %, while DMSO/NaOH catalytic system at 145 °C for 5 h was found maximum yield of 42.97 %. Recycled epoxy resin, the final product from hot solvent and DMSO/NaOH catalytic were showed similarly clear orange-yellow high viscosity. Comparatively, DMSO/NaOH system showed slightly darker color than that of hot solvent system. Functional group at 3000-2850, 1480-1540 and 1020-1040 cm-1, characterized from Fourier transform infrared spectroscopy (FT-IR), indicated that the both product were alkane, aromatic, and phenyl-O-C group, respectively. It could be confirmed that the beneficial functional group of recycled epoxy resin was appeared as a new epoxy resin.
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13

Hazarika, Parasa, Pallab Pahari, Manash Jyoti Borah et Dilip Konwar. « I2-SDS-H2O System : A highly Efficient Dual Catalytic Green System for Deprotection of Imines and in Situ Preparation of Bis(indolyl)alkanes from Indoles in Water ». ISRN Organic Chemistry 2012 (27 août 2012) : 1–6. http://dx.doi.org/10.5402/2012/635835.

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A novel catalytic system consisting of I2-SDS-H2O has been developed which cleaves 2,3-diaza-1,3-butadiene, 1-aza-1,3-butadienes, oximes and in presence of indoles in the medium uses the corresponding aldehyde products to produce bis(indolyl)alkanes in situ. This one pot simple and mild dual catalytic system works in water at room temperature under neutral conditions.
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14

Desens, Willi, Christina Kohrt, Anke Spannenberg et Thomas Werner. « A novel zinc based binary catalytic system for CO2utilization under mild conditions ». Organic Chemistry Frontiers 3, no 2 (2016) : 156–64. http://dx.doi.org/10.1039/c5qo00356c.

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15

Kour, Manmeet, et Satya Paul. « Sulfonated carbon/nano-metal oxide composites : a novel and recyclable solid acid catalyst for organic synthesis in benign reaction media ». New Journal of Chemistry 39, no 8 (2015) : 6338–50. http://dx.doi.org/10.1039/c5nj00607d.

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16

Xu, Yan, Huiqing Zeng, Dan Zhao, Shuhua Wang, Shunmin Ding et Chao Chen. « Green and Efficient Acquirement of Unsaturated Ether from Direct and Selective Hydrogenation Coupling Unsaturated Aldehyde with Alcohol by Bi-Functional Al-Ni-P Heterogeneous Catalysts ». Catalysts 13, no 2 (18 février 2023) : 439. http://dx.doi.org/10.3390/catal13020439.

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In view of the industrial importance of high-grade unsaturated ether (UE) and the inconvenience of acquiring the compound, herein, a series of low-cost Al-Ni-P catalysts in robust AlPO4/Ni2P structure possessing novel bi-functional catalytic features (hydrogenation activation and acid catalysis) were innovated, and testified to be efficient for directly synthesizing UE with a superior yield up to 97% from the selective hydrogenation coupling carbonyl of unsaturated aldehyde (cinnamaldehyde or citral) with C1–C5 primary or secondary alcohol under 0.1 MPa H2 and 393 K. The integrated advantages of high efficiency, green manner and convenient operation of the present heterogeneous catalytic system gave the system potential for feasibly harvesting high-grade unsaturated ether in related fine chemical synthesis networks.
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17

Bódis, Jenö, Thomas E. Müller et Johannes A. Lercher. « Novel hydroamination reactions in a liquid–liquid two-phase catalytic system ». Green Chemistry 5, no 2 (2003) : 227. http://dx.doi.org/10.1039/b212221a.

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18

Babjak, Matej, L’uboš Remeň, Peter Szolcsányi, Peter Zálupský, Dušan Mikloš et Tibor Gracza. « Novel bicyclisation of unsaturated polyols in PdCl2–CuCl2–AcOH catalytic system ». Journal of Organometallic Chemistry 691, no 5 (février 2006) : 928–40. http://dx.doi.org/10.1016/j.jorganchem.2005.10.036.

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19

Crynes, L. « Monolith froth reactor : development of a novel three-phase catalytic system ». International Journal of Multiphase Flow 22 (décembre 1996) : 94. http://dx.doi.org/10.1016/s0301-9322(97)88131-1.

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Crynes, Lawrence L., Ramon L. Cerro et Martin A. Abraham. « Monolith froth reactor : Development of a novel three-phase catalytic system ». AIChE Journal 41, no 2 (février 1995) : 337–45. http://dx.doi.org/10.1002/aic.690410215.

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Zhang, Xian Bin, Zheng Song Qiu, Da Quan Huang, Cui Xue Ma et En Cui Guan. « Removal of Organic Pollutant in Sulfonated Drilling Wastewater with Novel Solar-Assisted Catalytic Oxidation Process ». Advanced Materials Research 726-731 (août 2013) : 1917–21. http://dx.doi.org/10.4028/www.scientific.net/amr.726-731.1917.

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The chemical oxygen demand was over standard seriously due to residual organic additives in sulfonated drilling wastewater, especially sulfonated phenolic resin with hardly degradable chemical structure. The novel solar-assisted catalytic oxidation process was developed to remove the organic pollutants in sulfonated drilling wastewater. The factors including irradiation light source, oxidant, Fe2+, were investigated. The results showed that, solar has more catalytic effects than UV on H2O2-K2S2O8/Fe2+system, H2O2- K2S2O8/Fe2+system was more effective in degrading organic pollutants than H2O2/Fe2+and K2S2O8/Fe2+, in which the synergies occurred between H2O2and K2S2O8in the solar-assisted catalytic oxidation process. The removal amount of organic pollutants was increased with the dosage of Fe2+additon. With the catalytic oxidation process developed, the COD was reduced to 114.4 mg·L-1. Meanwhile, the sulfonated phenolic resin was completely destroyed, and heavy metal was decreased significantly.
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22

Huang, Sheng Tian, Shen Xin Li, Ying Wang, Song Wu et Wei Hu. « Hydrolysis of BNPP Catalyzed by the Dodecyliminodiacetate Nickel(II) and Copper(II) Complexes ». Advanced Materials Research 749 (août 2013) : 507–11. http://dx.doi.org/10.4028/www.scientific.net/amr.749.507.

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Two novel dodecyliminodiacetate nickel (II) and copper (II) complexes were synthesized and characterized, and these complexes were used as mimic hydrolytic in catalytic hydrolysis of bis (p-nitrophenyl) phosphate (BNPP). The analysis of specific absorption spectra of the hydrolytic reaction systems indicated that the catalytic hydrolysis involved the key intermediates formed by BNPP with nickel (II) complexes. The kinetic parameter of BNPP catalytic hydrolysis has been calculated and the temperature effect of reaction system and structure effect of the complexes on the rate of BNPP hydrolysis catalyzed by the complexes have been discussed.
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23

Li, Xiang, Chenyang Hu, Xuan Pang, Ranlong Duan et Xuesi Chen. « One-pot copolymerization of epoxides/carbon dioxide and lactide using a ternary catalyst system ». Catalysis Science & ; Technology 8, no 24 (2018) : 6452–57. http://dx.doi.org/10.1039/c8cy01856a.

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Maleki, Ali, Reza Taheri-Ledari et Reza Ghalavand. « Design and Fabrication of a Magnetite-based Polymer-supported Hybrid Nanocomposite : A Promising Heterogeneous Catalytic System Utilized in Known Palladium-assisted Coupling Reactions ». Combinatorial Chemistry & ; High Throughput Screening 23, no 2 (7 avril 2020) : 119–25. http://dx.doi.org/10.2174/1386207323666200128152136.

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Objective: Herein, a novel heterogeneous catalytic system constructed of iron oxide and palladium nanoparticles is presented. Firstly, a convenient synthetic pathway for the preparation of this catalytic system is introduced, then the application of the fabricated nanocomposite in the Pd-catalyzed C─C coupling reactions is monitored. High reaction yields (98%) have been obtained in short reaction time, by using this catalytic system. Materials and Methods: Fe3O4/P4VP-Pd catalytic system was fabricated via an in situ method by 4- vinylpyridine (4-VP). In this regard, all the essential structural analyses such as FT-IR, EDX, VSM, and TGA have been performed on the Fe3O4/P4VP-Pd catalytic system to investigate its properties. The spherical morphology of the NPs and their uniform size have also been studied by the SEM method. Further, the reaction progress was controlled by thin-layer chromatography. Finally, NMR analysis was used to identify the synthesized biphenyl pharmaceutical derivatives. Results: High efficiency of this catalytic system has been precisely investigated and the optimal conditions were determined. The catalytic process is carried out in 20 min, under mild conditions (room temperature). Then, the purification process is easily performed via magnetic separation of the catalyst NPs. After completion of the synthesis reaction, the NPs were collected, washed, and reused several times. Conclusion: Among recently reported heterogeneous catalytic systems, Fe3O4/P4VP-Pd is recommended due to its high catalytic performance, convenience of the preparation process, excellent biocompatibility, economic benefits, and well reusability. Overall, in order to save time in the complex synthetic processes and also prevent using so many chemical reagents and solvents for the purification process, the presented catalytic system could be suitable for scaling up and applying for the industrial applications.
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Rivilla, Iván, Abel de Cózar, Thomas Schäfer, Frank J. Hernandez, Alexander M. Bittner, Aitziber Eleta-Lopez, Ali Aboudzadeh, José I. Santos, José I. Miranda et Fernando P. Cossío. « Catalysis of a 1,3-dipolar reaction by distorted DNA incorporating a heterobimetallic platinum(ii) and copper(ii) complex ». Chemical Science 8, no 10 (2017) : 7038–46. http://dx.doi.org/10.1039/c7sc02311a.

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26

Braga, M. H., et A. El-Azab. « The catalytic reactions in the Cu–Li–Mg–H high capacity hydrogen storage system ». Phys. Chem. Chem. Phys. 16, no 42 (2014) : 23012–25. http://dx.doi.org/10.1039/c4cp01815j.

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27

Bakos, J., S. Cserépi-Szucs, Á. Gömöry, C. Hegedüs, L. Markó et Á. Szöllosy. « Asymmetric hydroformylation of styrene catalyzed by platinum complexes of chiral diphosphites with atropisomeric terminal moieties ». Canadian Journal of Chemistry 79, no 5-6 (1 mai 2001) : 725–30. http://dx.doi.org/10.1139/v01-085.

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To study the nature of steric and electronic effects of diphosphites, a novel diphosphite was synthesized and tested with regard of its catalytic performance in the hydroformylation of styrene catalyzed by platinum complexes. The novel ligand 3 was prepared by the reaction of enantiomerically pure pentane-2,4-diol with (S)-2-chloro-5,5',6,6',7,7',8,8'-octahydro-dinaphtho[2,1-d:1',2'-f][1,3,2]dioxaphosphepine based on H8-BINOL (H8-BINOL = 5,5',6,6',7,7',8,8'-octahydro-1,1'-bi-2-naphthol). For a comparative study, the BINOL (1,1'-bi-2-naphthol) based analogue 4 of 3 has also been synthesized. The highest chemoselectivity to aldehyde (71%) and regioselectivity to branched aldehyde (85%) with an enantiomer excess (ee) of 86% was obtained with the platinum(II)-SnCl2 catalytic system associated with (2S,4S)-bis(S)-3.Key words: asymmetric hydroformylation, chirality, homogeneous catalysis, P ligands, platinum.
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Zhao, Xiaohua, Xiang Liu et Ming Lu. « Thermoregulated Aqueous Biphasic Catalysis of Sonogashira Reactions ». Australian Journal of Chemistry 68, no 10 (2015) : 1614. http://dx.doi.org/10.1071/ch15123.

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A water-based thermoregulated system for Pd-catalyzed Sonogashira reactions is presented, which allows for not only a highly efficient homogeneous catalytic reaction, but also an easy separation/recovery of the catalyst. The novel catalytic system exhibits high efficiency and excellent reusability. In addition, the Sonogashira reactions are performed with Pd(OAc)2 without a copper co-catalyst.
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Liu, Lin, Juanjuan Ma, Zhen Sun, Jianping Zhang, Jingjing Huang, Shanzhong Li et Zhiwei Tong. « Supported task-specific ionic liquid catalyst for highly efficient and recyclable aerobic oxidation of benzyl alcohols ». Canadian Journal of Chemistry 89, no 1 (janvier 2011) : 68–71. http://dx.doi.org/10.1139/v10-163.

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A novel catalytic system was prepared by impregnating ionic liquid immobilized 2,2,6,6-tetramethylpiperidyl-1-oxyl (TEMPO) and copper salt onto various silica supports. This catalytic system was capable of rapidly converting different benzylic and allylic alcohols into the corresponding aldehydes under O2 atmosphere with high conversion. Recycling results showed that the catalyst could be easily recovered and reused.
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Lin, Shumiao, Qianqian Zhang, Ziheng Wang et Jinlong Li. « Novel Hybrid Gel–Fiber Membranes as Carriers for Lipase Catalysis Based on Electrospinning and Gelation Technology ». Gels 10, no 1 (18 janvier 2024) : 74. http://dx.doi.org/10.3390/gels10010074.

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An excellent oil–water interface is one of the prerequisites for effective lipase catalysis. Therefore, this study aimed to improve lipase activity in terms of catalytic interface optimization. A novel approach for constructing oil–water interfaces was proposed. The structural similarity and the hydrophilic differences between polyvinyl pyrrolidone gel–fiber membranes (GFMs) and poly(lauryl methacrylate) (PLMA) organogel inspired us to hybridize the two to form PVP/PLMA hybrid gel–fiber membranes (HGFMs) based on electrospinning and gelation. The prepared PVP/PLMA-HGFMs were capable of being adopted as novel carriers for lipase catalysis due to their ability to swell both in the aqueous phase (swelling ratio = 187.5%) and the organic phase (swelling ratio = 40.5%). Additionally, Confocal laser scanning microscopy (CLSM) results showed that abundant network pores inside the carriers enabled numerous effective microscopic oil–water interfaces. The catalytic activity of Burkholderia cepacia lipase (BCL) in PVP/PLMA-HGFMs ranged between 1.21 and 8.70 times that of the control (“oil-up/water-down” system) under different experimental conditions. Meanwhile, PVP/PLMA-HGFMs increased lipase activity by about eight times at −20 °C and had good application characteristics at extreme pH conditions.
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Rameshan, Raffael, Andreas Nenning, Johannes Raschhofer, Lorenz Lindenthal, Thomas Ruh, Harald Summerer, Alexander Karl Opitz, Tobias Martin Huber et Christoph Rameshan. « Novel Sample-Stage for Combined Near Ambient Pressure X-ray Photoelectron Spectroscopy, Catalytic Characterization and Electrochemical Impedance Spectroscopy ». Crystals 10, no 10 (17 octobre 2020) : 947. http://dx.doi.org/10.3390/cryst10100947.

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For an in-depth characterization of catalytic materials and their properties, spectroscopic in-situ (operando) investigations are indispensable. With the rapid development of advanced commercial spectroscopic equipment, it is possible to combine complementary methods in a single system. This allows for simultaneously gaining insights into surface and bulk properties of functional oxides, such as defect chemistry, catalytic characteristics, electronic structure, etc., enabling a direct correlation of structure and reactivity of catalyst materials, thus facilitating effective catalyst development. Here, we present a novel sample-stage, which was specifically developed to pave the way to a lab–based combination of near ambient pressure X-ray photoelectron spectroscopy and electrochemical impedance spectroscopy with simultaneous catalytic operando measurements. This setup is designed to probe different (model) systems under conditions close to real heterogeneous catalysis, with a focus on solid oxide electrochemical cells. In a proof of concept experiment using an electrochemical model cell with the doped perovskite Nd0.6Ca0.4Fe0.9Co0.1O3-δ as working electrode, the precise control of the surface chemistry that is possible with this setup is demonstrated. The exsolution behavior of the material was studied, showing that at a lower temperature (500 °C) with lower reducing potential of the gas phase, only cobalt was exsolved, forming metallic particles on the surface of the perovskite-type oxide. Only when the temperature was increased to 600 °C and a cathodic potential was applied (−250 mV) Fe also started to be released from the perovskite lattice.
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Cozza, Erika Simona, Valentina Bruzzo, Fabio Carniato, Enrico Marsano et Orietta Monticelli. « On a Novel Catalytic System Based on Electrospun Nanofibers and M-POSS ». ACS Applied Materials & ; Interfaces 4, no 2 (2 février 2012) : 604–7. http://dx.doi.org/10.1021/am201766r.

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Auer, E. « Supported iridium catalysts — a novel catalytic system for the synthesis of toluenediamine ». Catalysis Today 65, no 1 (1 février 2001) : 31–37. http://dx.doi.org/10.1016/s0920-5861(00)00542-3.

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Samuni, Uri. « Novel Catalytic Antioxidative Activity of Nitroxide Radicals in the Heme/H2O2 system ». Biophysical Journal 96, no 3 (février 2009) : 436a. http://dx.doi.org/10.1016/j.bpj.2008.12.2235.

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Kagawa, Natsuko, Masahiro Toyota et Masataka Ihara. « Yb(OTf)3 - TMSCl, a Novel Catalytic System in Cross-Aldol Reactions ». Australian Journal of Chemistry 57, no 7 (2004) : 655. http://dx.doi.org/10.1071/ch04006.

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A combination of Yb(OTf)3 and TMSCl influenced the outcome of cross-aldol reactions of cycloalkanones and benzaldehyde. Interestingly, reaction of cycloheptanone and cyclooctanone with aldehydes under the Yb(OTf)3–TMSCl reagent system provides 3-(2-oxocycloalkyl)-3-phenylpropanals in conjunction with the corresponding aldol products.
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Sun, Zhengguang, Fangming Zhu, Qing Wu et Shang-an Lin. « Vinyl polymerization of norbornene with novel nickel (II) diphosphinoamine/methylaluminoxane catalytic system ». Applied Organometallic Chemistry 20, no 3 (2006) : 175–80. http://dx.doi.org/10.1002/aoc.1024.

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Talik, Gabriela, Anna Osial, Mirosława Grymel et Beata Orlińska. « N-Hydroxyphthalimide on a Polystyrene Support Coated with Co(II)-Containing Ionic Liquid as a New Catalytic System for Solvent-Free Ethylbenzene Oxidation ». Catalysts 10, no 12 (24 novembre 2020) : 1367. http://dx.doi.org/10.3390/catal10121367.

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The oxidation of ethylbenzene using dioxygen was carried out applying a new catalytic system—heterogeneous N-hydroxyphthalimide (PS-NHPI) coated with an ionic liquid containing CoCl2. The catalytic system represents a combination of solid catalyst with ionic liquid layer (SCILL) and supported ionic liquid phase (SILP) techniques, wherein the resulting system utilizes CoCl2 dissolved in the 1-ethyl-3-methylimidazolium octyl sulphate ([emim)][OcOSO3]) ionic liquid phase that is layered onto the solid catalyst support. PS-NHPI was obtained by immobilizing N-hydroxyphthalimide on chloromethyl polystyrene resins by ester bonds. It was observed that novel SCILL/SILP systems significantly improved the selectivity toward acetophenone. We also demonstrate that these systems can be separated from the reaction mixture and recycled without appreciably reducing its activity and selectivity.
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Shitole, Shubham. « Nanoparticle - Novel Drug Delivery System : A Review ». International Journal for Research in Applied Science and Engineering Technology 10, no 1 (31 janvier 2022) : 517–30. http://dx.doi.org/10.22214/ijraset.2022.39849.

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Abstract: For the past few years, there has been a considerable research on the basis of Novel drug delivery system, using particulate vesicle systems as such drug carriers for small and large molecules. Nanoparticles, Liposomes, Microspheres, Niosomes, Pronisomes, Ethosomes, Proliposomes have been used as drug carrier in vesicle drug delivery system. Nanotechnology refers to the creation and utilization of materials whose constituents exist at the nanoscale; and, by convention, be up to 100 nm in size.. Nanoparticles are being used for diverse purposes, from medical treatments, using in various branches of industry production such as solar and oxide fuel batteries for energy storage, to wide incorporation into diverse materials of everyday use such as cosmetics or clothes, optical devices, catalytic, bactericidal, electronic, sensor technology, biological labelling and treatment of some cancers. Various polymers have been used in the formation of Nanoparticles. Nanoparticles have been improving the therapeutic effect of drugs and minimize the side effects. Basically, Nanoparticles have been prepared by using various techniques as such dispersion of preformed polymers, polymerization of monomers and ionic gelation or coacervation of hydrophilic polymer. Nanoparticles have been evaluated by using parameters of drug entrapment efficiency, particle shape, drug release study. Keywords: Nanoparticles, Drug, novel, delivery
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Kovacev, Nikolina, Sheng Li, Weining Li, Soheil Zeraati-Rezaei, Athanasios Tsolakis et Khamis Essa. « Additive Manufacturing of Novel Hybrid Monolithic Ceramic Substrates ». Aerospace 9, no 5 (7 mai 2022) : 255. http://dx.doi.org/10.3390/aerospace9050255.

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Additive manufacturing (AM) can revolutionise engineering by taking advantage of unconstrained design and overcoming the limitations of traditional manufacturing capabilities. A promising application of AM is in catalyst substrate manufacturing, aimed at the enhancement of the catalytic efficiency and reduction in the volume and weight of the catalytic reactors in the exhaust gas aftertreatment systems. This work addresses the design and fabrication of innovative, hybrid monolithic ceramic substrates using AM technology based on Digital Light Processing (DLP). The designs are based on two individual substrates integrated into a single, dual-substrate monolith by various interlocking systems. These novel dual-substrate monoliths lay the foundation for the potential reduction in the complexity and expense of the aftertreatment system. Several examples of interlocking systems for dual substrates were designed, manufactured and thermally post-processed to illustrate the viability and versatility of the DLP manufacturing process. Based on the findings, the sintered parts displayed anisotropic sintering shrinkage of approximately 14% in the X–Y direction and 19% in the Z direction, with a sintered density of 97.88 ± 0.01%. Finally, mechanical tests revealed the mechanical integrity of the designed interlocks. U-lock and Thread configurations were found to sustain more load until complete failure.
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Lin, Huan, Zongjiang Yu, Qian Wang, Yaojie Liu, Long Jiang, Chao Xu et Mo Xian. « Application of Laccase Catalysis in Bond Formation and Breakage : A Review ». Catalysts 13, no 4 (14 avril 2023) : 750. http://dx.doi.org/10.3390/catal13040750.

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Laccase belongs to the superfamily of multicopper oxidases and has been widely investigated in recent decades. Due to its mild and efficient oxidation of substrates, laccase has been successfully applied in organic catalytic synthesis, the degradation of harmful substances, and other green catalytic fields. Nevertheless, there are few reports on the green catalysis with laccase. This review focuses on reporting and collating some of the latest interesting laccase-catalyzed bond formation and breakage research. This is discussed with a focus on the effects of the medium system on the laccase-catalyzed reaction, as well as the formation and the breakage of C–N, C–C, and C–O bonds catalyzed by laccase. It provides abundant references and novel insights for furthering the industrial applications of laccase.
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Caricato, Enrico, John H. Hoffeldt, P. D. Riekert Kotze, Jared A. Lloyd, Nicolaas M. Prinsloo et Carel J. Swanepoel. « Catalytic Naphtha Reforming : A Novel Control System for the Bench-Scale Evaluation of Commercial Continuous Catalytic Regeneration Catalysts ». Industrial & ; Engineering Chemistry Research 56, no 23 (juin 2017) : 6854–63. http://dx.doi.org/10.1021/acs.iecr.7b00399.

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Shi, Wen Ying, Hong Bin Li et Rong Zhou. « A Novel SPES/PES Catalytic Membrane for Production Biodiesel : Optimization by Central Composite Design ». Applied Mechanics and Materials 628 (septembre 2014) : 338–41. http://dx.doi.org/10.4028/www.scientific.net/amm.628.338.

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A sulfonated polyethersulfone (SPES)/polyethersulfone (PES) blend catalytic membrane was prepared and used as a heterogeneous catalyst in the esterification of oleic acid with methanol for producing biodiesel. Response surface methodology (RSM) based on central composite design (CCD) was used to optimize the three important reaction variables methanol/oleic acid mass ratio, catalytic membrane loading and reaction time for the esterification by SPES/PES blend catalytic membrane. The optimum condition for the esterification was as follows: methanol/oleic acid mass ratio 1:1, catalytic membrane loading 1.66 meq/g, reaction time 6 h. The optimum predicted fatty acid methyl ester (FAME) yield was 97.44% and the actual value was 98.64%. The above results shows that the RSM study based on CCD is adaptable for FAME yield studied for the current esterification system.
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Motroniuk, I., R. Stöber et G. Fischerauer. « State determination of catalytic converters based on an ultra-wideband communication system ». Journal of Sensors and Sensor Systems 4, no 2 (10 août 2015) : 255–62. http://dx.doi.org/10.5194/jsss-4-255-2015.

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Abstract. A novel microwave-based approach for monitoring the state of aftertreatment systems such as diesel particulate filters (DPFs), three-way catalytic converters (TWCs), and selective catalytic reduction (SCR) catalysts is proposed. The volume inside the metallic housing of the DPF, TWC, or SCR is considered as a wireless communication channel between two terminals of a communication system. It is shown that, depending on the transmission channel characteristics, the properties of the catalyst, such as the catalyst state, can be inferred. This is done by means of an ultra-wideband (UWB) measurement and the subsequent evaluation and processing of the waveform in the time and frequency domains.
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Taheri-Ledari, Reza, Mir Saeed Esmaeili, Zahra Varzi, Reza Eivazzadeh-Keihan, Ali Maleki et Ahmed Esmail Shalan. « Facile route to synthesize Fe3O4@acacia–SO3H nanocomposite as a heterogeneous magnetic system for catalytic applications ». RSC Advances 10, no 66 (2020) : 40055–67. http://dx.doi.org/10.1039/d0ra07986c.

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Gómez Millán, Gerardo, et Herbert Sixta. « Towards the Green Synthesis of Furfuryl Alcohol in A One-Pot System from Xylose : A Review ». Catalysts 10, no 10 (23 septembre 2020) : 1101. http://dx.doi.org/10.3390/catal10101101.

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In the pursuit of establishing a sustainable biobased economy, valorization of lignocellulosic biomass is increasing its value as a feedstock. Nevertheless, to achieve the integrated biorefinery paradigm, the selective fractionation of its complex matrix to its single constituents must be complete. This review presents and examines the novel catalytic pathways to form furfuryl alcohol (FuOH) from xylose in a one-pot system. This production concept takes on chemical, thermochemical and biochemical transformations or a combination of them. Still, the bulk of the research is targeted to develop heterogeneous catalytic systems to synthesize FuOH from furfural and xylose. The present review includes an overview of the economic aspects to produce this platform chemical in an industrial manner. In the last section of this review, an outlook and summary of catalytic processes to produce FuOH are highlighted.
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Martínez-Castañeda, Ángel, Humberto Rodríguez-Solla, Carmen Concellón et Vicente del Amo. « TBD/Al2O3 : a novel catalytic system for dynamic intermolecular aldol reactions that exhibit complex system behaviour ». Organic & ; Biomolecular Chemistry 10, no 10 (2012) : 1976. http://dx.doi.org/10.1039/c2ob06648c.

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Ballarin, Barbara, Davide Barreca, Elisa Boanini, Elisa Bonansegna, Maria Cristina Cassani, Giorgio Carraro, Silvia Fazzini, Adriana Mignani, Daniele Nanni et Davide Pinelli. « Functionalization of silica through thiol-yne radical chemistry : a catalytic system based on gold nanoparticles supported on amino-sulfide-branched silica ». RSC Advances 6, no 31 (2016) : 25780–88. http://dx.doi.org/10.1039/c6ra02479c.

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Liang, Chen, Xinhao Luo et Yongyou Hu. « Enhanced Ozone Oxidation by a Novel Fe/Mn@γ−Al2O3 Nanocatalyst : The Role of Hydroxyl Radical and Singlet Oxygen ». Water 14, no 1 (22 décembre 2021) : 19. http://dx.doi.org/10.3390/w14010019.

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Catalytic ozonation is a potential alternative to address the dye wastewater effluent, and developing an effective catalyst for catalyzing ozone is desired. In this study, a novel Fe/Mn@γ−Al2O3 nanomaterial was prepared and successfully utilized for catalytic ozonation toward dye wastewater effluent components (dimethyl phthalate and 1−naphthol). The synthesized Fe/Mn@γ−Al2O3 exhibited superior activity in catalytic ozonation of dimethyl phthalate and 1−naphthol in contrast to Fe@γ−Al2O3 and Mn@γ−Al2O3. Quench and probe tests indicated that HO° contributed to almost all removal of dimethyl phthalate, whereas O3, HO°, and singlet oxygen participated in the degradation of 1−naphthol in the Fe/Mn@γ−Al2O3/O3 system. The results of XPS, FT−IR, and EPR suggested that HO° and singlet oxygen were generated from the valence variations of Fe(II/III)and Mn(III/IV). Moreover, the Fe/Mn@γ−Al2O3/O3 system could also have excellent efficacy in actual water samples, including dye wastewater effluent. This study presents an efficient ozone catalyst to purify dye wastewater effluent and deepens the comprehension of the role and formation of reactive species involved in the catalytic ozonation system.
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LEE, Byung Rho, Masato FURUKAWA, Koichiro YAMASHITA, Yurie KANASUGI, Choko KAWABATA, Kenichi HIRANO, Kenichi ANDO et Eiji ICHISHIMA. « Aorsin, a novel serine proteinase with trypsin-like specificity at acidic pH ». Biochemical Journal 371, no 2 (15 avril 2003) : 541–48. http://dx.doi.org/10.1042/bj20021691.

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A proteinase that hydrolyses clupeine and salmine at acidic pH, called aorsin, was found in the fungus Aspergillus oryzae. Purified aorsin also hydrolysed benzyloxycarbonyl-Arg-Arg-4-methylcoumaryl-7-amide optimally at pH4.0. The specificity of aorsin appeared to require a basic residue at the P1 position and to prefer paired basic residues. Aorsin activated plasminogen and converted trypsinogen to trypsin. The trypsin-like activity was inhibited strongly by antipain or leupeptin, but was not inhibited by any other standard inhibitors of peptidases. To identify the catalytic residues of aorsin, a gene was cloned and an expression system was established. The predicted mature protein of aorsin was 35% identical with the classical late-infantile neuronal ceroid lipofuscinosis protein CLN2p and was 24% identical with Pseudomonas serine-carboxyl proteinase, both of which are pepstatin-insensitive carboxyl proteinases. Several putative catalytic residues were mutated. The kcat/Km values of the mutant enzymes Glu86→Gln, Asp211→Asn and Ser354→Thr were 3–4 orders of magnitude lower and Asp90→Asn was 21-fold lower than that of wild-type aorsin, indicating that the positions are important for catalysis. Aorsin is another of the S53 family serine-carboxyl proteinases that are not inhibited by pepstatin.
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Hou, Lekai, Xiangxiang Chen, Shuang Li, Suxian Cai, Yanxia Zhao, Meng Sun et Xiao-Juan Yang. « Palladium-catalyzed regio-selective oxidative C–H bond acylation of azoxybenzenes with alcohols ». Organic & ; Biomolecular Chemistry 13, no 14 (2015) : 4160–64. http://dx.doi.org/10.1039/c5ob00089k.

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