Thematische Bibliographien / HY synthesis

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Auswahl der wissenschaftlichen Literatur zum Thema „HY synthesis“

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Veröffentlicht am 25. Mai 2024

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Zeitschriftenartikel zum Thema "HY synthesis"

Ruan, Xiao, Feng Wei, Li Yang, Yingxian Zhao und Qiang Wang. „Interpretation of the mechanism of 3,3′-dichloro-4,4′-diamino diphenylmethane synthesis over HY zeolites“. RSC Advances 10, Nr. 57 (2020): 34719–28. http://dx.doi.org/10.1039/d0ra06475k.

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Catalytic activities of zeolites HY, Hβ and HZSM-5 in the heterogeneous synthesis of 3,3′-dichloro-4,4′-diaminodiphenyl methane (MOCA) from o-chloroaniline and formaldehyde were pre-screened in an autoclave, and HY demonstrated better performance than others.

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Sumari, Sumari, Aman Santoso, Muhammad Roy Asrori, Yana Fajar Prakasa und Dinar Rachmadika Baharintasari. „Sono-hydrolysis of banana stem midrib using HY-zeolite from natural sand-based silica as a catalyst“. International Journal of Advances in Applied Sciences 11, Nr. 4 (01.12.2022): 306. http://dx.doi.org/10.11591/ijaas.v11.i4.pp306-311.

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<span>Banana stem midrib has potential as glucose source through catalytic hydrolysis assisted by ultrasonic (sono-hydrolysis). Besides, natural sand-based silica is potential as raw material for zeolite synthesis. The purpose of the study was to do two things: i) characterize HY-zeolite made from natural sand-based silica and ii) determine whether or not HY-zeolite is effective for sono-hydrolysis of banana stem midrib. There was a total of four processes that were carried out, including i) the extraction of silica, ii) the synthesis of HY zeolite, iii) the hydrolysis process, and iv) the glucose content test. The results of the study were gain two things: i) The findings of X-ray florescence </span><span>(XRF), X-ray diffraction (XRD), scanning electron microscopy (SEM), and fourier transform infrared (FTIR) on HY-zeolite are 2.3 Si/Al, obtained 2 theta and d-spacing data similarities for HY-zeolite, and formed T-O-T, O-T-O (T = Si/Al), and Si-OH groups respectively; and ii) HY-zeolite with ultrasonic was effective for hydrolyzing cellulose into glucose at maximum temperature and time, 55 °C and 6 hours.</span>

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Tessari, Paolo, Edward Kiwanuka, Michela Zanetti und Rocco Barazzoni. „Postprandial body protein synthesis and amino acid catabolism measured with leucine and phenylalanine-tyrosine tracers“. American Journal of Physiology-Endocrinology and Metabolism 284, Nr. 5 (01.05.2003): E1037—E1042. http://dx.doi.org/10.1152/ajpendo.00416.2002.

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Whether phenylalanine-tyrosine (Phe-Tyr) tracers yield estimates of postprandial protein synthesis comparable to those of the widely used leucine (Leu) tracer is unclear. We measured Leu oxidation (Ox), Phe hydroxylation (Hy), and their disposal into whole body protein synthesis before and after the administration of a mixed meal (62 kJ/kg body wt, 22% of energy as protein), over 4 h in healthy subjects. Both plasma and intracellular precursor pools were used. The amino acid data were extrapolated to body protein by assuming a fixed ratio of Leu to Phe in the proteins. In the postabsorptive state, whole body protein synthesis (expressed as mg · kg−1 · min−1) was similar between Leu and Phe-Tyr tracers irrespective of the precursor pool used. After the meal, Leu Ox, Phe Hy, and body protein synthesis increased ( P ≤ 0.01 vs. basal). With the use of intracellular precursor pools, the increase of protein synthesis with Phe-Tyr (+0.51 ±0.21 mg · kg−1 · min−1) and Leu tracers (+0.57 ± 0.14) were similar ( P = not significant). In contrast, with plasma pools the increase of protein synthesis was more than twofold greater with Phe-Tyr (+1.17 ± 0.19 mg · kg−1 · min−1) than that with Leu (0.50 ± 0.13 mg · kg−1 · min−1, P < 0.01). Direct correlations were found between Leu and Ox [using both plasma and intracellular pools ( r ≤ 0.65, P ≤ 0.01)] but not between Phe and either plasma or intracellular Hy. In conclusion, 1) Phe-Tyr and Leu tracers yield comparable estimates of body protein synthesis postprandially, provided that intracellular precursor pools are used; 2) both Leu Ox and Phe Hy are stimulated by a mixed meal; 3) Phe does not correlate with Hy, which might be better related to the (unknown) portal Phe.

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Chen, Fei, Dongxi Zhang, Lei Shi, Yan Wang und Guangwen Xu. „Optimized Pore Structures of Hierarchical HY Zeolites for Highly Selective Production of Methyl Methoxyacetate“. Catalysts 9, Nr. 10 (18.10.2019): 865. http://dx.doi.org/10.3390/catal9100865.

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Several organic templates were introduced during acid or alkaline treatment to optimize pore structures of hierarchical HY zeolites. The influences of category and concentration of templates on the pore structures and acidity of hierarchical HY zeolites were systemically studied. The N2 adsorption-desorption showed that the micropore amount of the optimized HY zeolites obviously increased, while both the large mesopore size and amount remained almost unchanged. The XRD and NH3-TPD revealed that the optimized HY zeolites exhibited higher relative crystallinity and medium-strong acid sites amount than those of hierarchical HY zeolites produced without the addition of templates. The optimized HY zeolites were used for the synthesis of methyl methoxyacetate (MMAc) from dimethoxymethane (DMM) carbonylation. In comparison with parent HY, the conversion and the selectivity clearly increased from 36.43% to 96.32% and from 11.06% to 92.35%, respectively. The stability of the optimized zeolite was also conducted under the same conditions. The conversion and the selectivity remained nearly unchanged even through 24 h reaction, showing that the performance was extremely stable. The TG-DTA and GC-MS also indicated that the generation of coke was effectively inhibited. This catalyst treatment method, which is facile and highly efficient, provided a route for producing mesoporous zeolites.

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Nagliati, Marco, M. C. Carotta, S. Gherardi, Isidoro Giorgio Lesci und G. Martinelli. „TiO₂ Nanopowders for Sensing Applications; A Comparison between Traditional and Hydrothermal Synthesis Way“. Advances in Science and Technology 45 (Oktober 2006): 205–8. http://dx.doi.org/10.4028/www.scientific.net/ast.45.205.

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Aim of the work is to compare the morphological properties of TiO2 powders obtained by different methods. The microstructure of powders is a fundamental parameter to judge if the material is suitable for gas sensing. Materials for chemical sensors have to be composed by nanometric and spherical shaped grains sintered in controlled conditions aimed to obtain Schottky barriers. We investigated a traditional sol-gel (SG) and an hydrothermal (HY) approach to obtain titanium dioxide powders. The same starting materials were chosen for both SG and HY method, a Ti-organometallic precursor and, as solvent, an hydroalcoholic solution. The work is focused on the different methodology and on the outcome related to the two methods (we describe step by step both of them). HY TiO2 powder shows smaller grains than SG TiO2 maintaining spherical shape. A comparison among different handled HY powders shows the role of dwelling time (at fixed temperature) on the nanostructure of grains. Experimental observations are mainly based on XRD and SEM analyses.

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Xu, Juan, Li Li Jing und Can Xiong Guo. „Preparation of the Novel Nanocomposite Biurea/Montmorillonite via In Situ Synthesis“. Advanced Materials Research 486 (März 2012): 388–93. http://dx.doi.org/10.4028/www.scientific.net/amr.486.388.

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Using the urea intercalated montmorillonite (Urea/MMT) as the precursor, a novel nanocomposite biurea intercalated montmorillonite (Biurea/MMT) was prepared via the in-situ synthesis process through the introduction of hydrazine hydrate (HY). The resulted nanocomposites were characterized by using techniques such as XRD, FTIR, solid state NMR as well as thermal analyses, etc. The influence of the concentration of the HY on the products was also investigated. The XRD results showed the variation of the interlayer spacing of MMT from 1.51 nm to 1.71 nm for Urea/MMT. When the concentration of HY was low, the substitution of urea by HY was taken place which resulted in the decrease of the interlayer distance to 1.27nm. When the concentration increased to greater than 40%, the new phase with basal spacing of 1.75 nm was dominated. It indicated that a novel nanocomposite was synthesized in-situ. The solid state NMR results confirmed the in-situ formation of Biurea/MMT in which the chemical shifts of13C and15N of the intercalated biurea were slightly different from the bulk biurea. The intercalated biurea decomposed easily than those bulk powders due to the highly dispersion in the interlayer space of MMT.

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Susanti, Yuni, und Yeni Variyana. „Stabilitas Zeolit HY Hidrofobik terhadap Uji Hot Liquid Water (HLW)“. Jurnal Teknik Kimia USU 10, Nr. 2 (18.09.2021): 58–62. http://dx.doi.org/10.32734/jtk.v10i2.6250.

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Initially, zeolite catalysts cannot be used for reactions involving hot liquid water, so it is necessary to modify the zeolite to be stable under these conditions. The synthesis of HY and hydrophobic zeolites aimed to determine the stability of zeolite in hot liquid water (HLW). The stability of zeolite in HLW is related to zeolite hydrophobicity. In this study, the main raw materials for the synthesis of HY zeolite were sodium aluminate (NaAlO2) and Ludox HS-40 by calcining the product at 350 oC for 1 hour. Furthermore, increasing the hydrophobicity of HY zeolite was carried out by modifying the external zeolite surface using organosilanes (aminopropyltriethoxysilane). The stability of two zeolites in HLW was set at 200 oC. Zeolite analysis used physical test and Fourier Transform-Infra Red (FTIR) Spectrometer. The results of the zeolite distribution in two phases confirmed that HY zeolite was completely dispersed in the water phase, while the zeolite one was dispersed in the organic phase. Moreover, the IR spectra of HY zeolite showed that the wide peak detection at wave number 720 cm-1 for beginning to disappear. This means that the HLW condition could be damaged to the d6r unit. Another result was shown by hydrophobic zeolite spectra with a stable peak for 72 hours. This indicates that the hydrophobic zeolite has thermal stability in HLW so that it can be used in chemical reaction catalytic applications that use on phase.

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Kogelbauer, A., M. Ocal, A. A. Nikolopoulos, J. G. Goodwin und G. Marcelin. „MTBE Synthesis on Partially Alkali-Exchanged HY Zeolites“. Journal of Catalysis 148, Nr. 1 (Juli 1994): 157–63. http://dx.doi.org/10.1006/jcat.1994.1197.

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Sapawe, Norzahir, und Muhammad Farhan Hanafi. „Facile one-pot electrosynthesis of high photoreactive hexacoordinated Si with Zr and Zn catalyst“. RSC Advances 5, Nr. 92 (2015): 75141–44. http://dx.doi.org/10.1039/c5ra13471d.

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Venu Gopal, D., und M. Subrahmanyam. „Selective synthesis of 3-isopropylindole over modified HY zeolites“. Catalysis Communications 2, Nr. 10 (Dezember 2001): 305–10. http://dx.doi.org/10.1016/s1566-7367(01)00051-6.

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Dissertationen zum Thema "HY synthesis"

Abushammala, Haneen. „Tuning the multiorbital Mott transition of BaCoS2“. Electronic Thesis or Diss., Sorbonne université, 2021. http://www.theses.fr/2021SORUS100.

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Dans cette thèse nous ajustons la phase d’isolant de Mott du BaCoS2, un modèle multiorbital pour l’étude des corrélations électroniques. Nous avons développer une nouvelle technique de self-flux afin de produire des cristaux de qualité et de taille supérieures. Puis nous avons confirmé une phase stable orthorhombique Cmma à l’ambiante où la distorsion orthorhombique est concomitante à l’établissement d’un ordre AFM de longue portée. Ensuite, nous avons exploré la possibilité d’induire un état métallique dans du BaCoS2 via pression chimique et dopage électronique comme paramètres de contrôle. Pour cela, nous avons appliqué des techniques HP pour synthétiser des échantillons de Ba1−xSrxCoS2 et Ba1−xKxCoS2 avec x allant jusqu’à 0,07. On s’attend à ce que la substitution partielle du Ba par du Sr ou du K induise de la pression chimique ou du dopage de trous respectivement, favorisant ainsi une phase métallique dans les deux cas
In this thesis we tune the Mott insulating phase of BaCoS2, a playground for the study of electronic correlations in a multiorbital system. We first developed a novel self-flux technique to grow single crystals of improved quality and size. We then confirmed a stable orthorhombic Cmma phase at ambient conditions where the orthorhombic distortion is concomitant to a long-range AFM order, suggesting a scenario of orbital ordering that stabilises this order. Next, we explored the possibility of inducing a metallic state in BaCoS2 using chemical pressure and electronic doping as control parameters. For this goal, we successfully applied HP technique to the synthesis of Ba1−xSrxCoS2 and Ba1−xKxCoS2 samples with x up to 0.07. The partial substitution of Ba for Sr or K is expected to produce chemical pressure or hole-doping, respectively, thus favouring a metallic phase in both cases. We find that both substitutions induce similar structural changes, and a full suppression of the orthorhombic distortion and of the AFM order. However, no indication of metallic properties is found in the Ba1−xSrxCoS2 samples. However, a sizeable value of Sommerfeld coefficient,γ= 5.7mJ mol−1K−2 is found at 7% of K-substitution suggesting a metallic state induced by hole doping

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Brown, Nicole Chantae. „The mechanism of T cell dysfunction induced by Diethylstilbestrol“. VCU Scholars Compass, 2005. http://scholarscompass.vcu.edu/etd/1321.

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Estrogens have the ability to alter the immune system. Diethylstilbestrol (DES), asynthetic estrogen, is known to have estrogenic activity and induce thymic alterations.We investigated the mechanism by which DES is able to alter T cells and thus theimmune system. First, we studied the effect of DES on mature T cells by using the T cellleukemia cell line, Jurkat. We found that DES treatment reduced cell viability andincreased apoptosis. Additionally, apoptosis was found to involve both death receptorand mitochondria1 pathways. Furthermore, estrogen receptor beta was found to beexpressed in these cells and increased following DES treatment. Secondly, we studiedthe effect of DES on developing T cells using two different mouse models, timed pregnant and HY-TCR transgenic. The pregnant mouse model showed that DESexposure in utero reduced thymic cell viability and induced apoptosis at gestational day(gd)-17. Apoptosis was found to involve the death receptor pathway. Additionally,alterations in T cell subsets was most pronounced at gd-17 as well. The HY-TCR tgmouse model showed that DES exposure altered both positive and negative selection of Tcells. Furthermore, DES was found to alter the ability of T cells to proliferate during animmune response. Finally, we studied the intrathymic interaction between thymicstromal cells and thymic T cells. We found that cel1:cell interaction was important forinducing T cell apoptosis in the thymus. Additionally, FasL expression was increased onthymic stromal cells following DES exposure. Furthermore, the presence of both FasL onstromal cells and Fas on T cells was important for inducing T cell apoptosis in thethymus.

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Buchteile zum Thema "HY synthesis"

Jeong, H., K. Kim, D. Kim und I. K. Song. „Methane reforming with carbon dioxide to synthesis gas over Mg-promoted M/HY catalyst“. In New Developments and Application in Chemical Reaction Engineering, 189–92. Elsevier, 2006. http://dx.doi.org/10.1016/s0167-2991(06)81565-x.

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Auroux, A., und M. L. Occelli. „13-P-07-The use of microcalorimetry to study the effects of post-synthesis treatments on the modification of the acidity of several HY-type zeolites“. In Studies in Surface Science and Catalysis, 340. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81786-9.

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Occelli, M. L., A. Auroux, M. Kalwei, A. Wölker und H. Eckert. „The use of microcalorimetry and solid state nuclear magnetic resonance (NMR) to study the effects of post-synthesis treatments on the acidity and framework composition of several HY-type zeolites“. In Fluid Catalytic Cracking V Materials and Technological Innovations, 41–58. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)82309-0.

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Lebow, David, Dale Lick und Hope Hartman. „New Technology for Empowering Virtual Communities“. In Encyclopedia of Multimedia Technology and Networking, Second Edition, 1066–71. IGI Global, 2009. http://dx.doi.org/10.4018/978-1-60566-014-1.ch144.

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In an essay entitled, The Next Information Revolution, Peter Drucker (1997) compared the existing business environment to conditions in the sixteenth century within the emerging publishing industry. Up until the mid 1500s, the people who controlled the industry were skilled printer craftsmen. By the end of the century, a major shift had occurred as publishers replaced craftsmen as the industry leaders. What had happened, according to Drucker, was that the focus shifted from the “T” in IT to the “I.” Drawing an analogy to the present, Drucker suggested that the current information revolution will have a transformational effect on society only when new technology realizes its potential impact on the meaning of information. This article describes a hybrid social software and hypermedia authoring system, referred to as HyLighter, which may fit Drucker’s definition of transformational technology. Social software (also referred to as social networking software) is a broad category of Internet applications for connecting individuals and forming virtual communities using various forms of computer- mediated communication. Hypermedia refers to a computer environment in which multiple linkages enable users to navigate from one segment of audio, video, graphic, or textual data to another segment. Hy- Lighter builds on the affordances of these and related technologies to extend the capacity of the document as a medium for the social construction of meaning. In the process, HyLighter aims to improve individual and group performance in a wide range of domains and interdisciplinary problem areas, improve the quality of instruction, and develop proficient learners (i.e., strategic, self-regulated learners who know how, when, and where to apply appropriate learning activities across various content areas) (Hartman, 2001). This article also describes an advanced adaptation of HyLighter, referred to as Coalesce, which is currently under development. When fully realized, Coalesce will help users merge ideas together from many sources into a unified whole that expresses a new perspective. The process identifies important ideas in multiple texts and exposes a range of views on selected points among a group of users. It also coordinates group activities in organizing and elaborating on the ideas of authors and readers toward achieving a cohesive, meaningful whole. In sum, HyLighter emphasizes responding to a document and social analysis whereas Coalese empasizes the social construction of a new document through social analysis and synthesis. Such new and emerging technologies supports a type of knowledge-building process aimed at empowering virtual communities engaged in knowledge intensive enterprises in a world awash with information.

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„minutes retention depending on the oil processed. Then, Synthetic silica hydrogels: Described in the immediately the oil is heated to 70°C, (158°F) to assist "breaking" the preceding section. emulsion and the mixture is passed through a primary (first) centrifuge. The general dosage of acid-activated bleaching earths is 0.3-0.6%, depending on the quality of the oil and bleach-In contrast, the short-mix process, developed in Europe, ing earth. Bleaching earths provide catalytic sites for de-is conducted at 90°C (84°F), uses a more highly concen-composition of oxidation products. Peroxide values (mea-trated caustic, and a mixing time and primary centrifuging sure of aldehydes) and p-anisidine values (precursors for time of less than 1 minute [135]. Less heat damage to the oxidative degradation) first rise and then decrease during oil and higher refining yield are claimed by advocates of bleaching. Bleaching processes used include atmospheric the long mix process. batch, vacuum batch, and continuous vacuum. Vacuum 4. Silica Absorption bleaching has the advantage of excluding air, partially by In traditional refining, oil from the primary centrifuge is vaporization of water in the earth, and is recommended. A washed with warm soft water to remove residual soap and typical vacuum bleaching process is 20-30 minimum at passed through a (secondary) centrifuge. The washed oil 100-110°C (212-230°F) and 50 mmHg absolute [135]. then is dried under vacuum. However, disposal of wash The reactions catalyzed during bleaching continue into water is increasingly becoming a problem, and the indus-the filter bed and are known as the "press bleaching ef-try is shifting to a modified caustic "waterless" refining fect." The reactive components of oil remain in the bleach-process. Soaps poison the adsorption sites of clays in later ing bed. Care should be taken to "blow" the filter press as bleaching operations and are removed by silica hydrogels. free of oil as possible and to wet the filter cake (which can The oil may be degummed with use of chelating acids, be very dusty) to prevent spontaneous combustion [137]. caustic neutralized, passed through a primary centrifuge, At this point, the product is RB ("refined, bleached") and may be partially vacuum-dried. Synthetic silica hy-oil. If the intended product is an oil, it can be sent to the de-drogels, effective in removing 7-25 times more phos-odorizer and become RBD. If solids are desired, the solids-phatides and soaps than clay on a solids basis, and for re-temperature profile of the oil may be modified by hydro-moving phosphorus and the major metal ions, is added genation, interesterification, or chill fractionation, alone or and mixed with the oil. By absorbing these contaminants in combination. first, the bleaching clay is spared for adsorbing chloro-6. Hydrogenation phyll and the oxidation-degradation products of oil Hydrogenation is the process of adding hydrogen to satu-[136-138]. rate carbon-to-carbon double bonds. It is used to raise try-5. Bleaching glyceride melting points and to increase stability as by jective of bleaching is to remove various contami-converting linolenic acid to linoleic in soybean oil [141]. A The ob lighter, "brush" hydrogenation is used for the latter pur-nants, pigments, metals, and oxidation products before the pose. oil is sent to the deodorizer. Removal of sulfur is especial-Most of the catalysts that assist hydrogenation are nick-ly important before hydrogenation of canola and rapeseed el-based, but a variety is available for special applications. oils. Flavor of the oil also is improved. As mentioned in the "Selectivity" refers to ability of the catalyst and process to preceding section, silica hydrogels will adsorb many of sequentially saturate fatty acids on the triglycerides in the these contaminants and spare the bleaching earth. Howev-order of most unsaturated to the fully saturated. For row er, earths are still used for these purposes in installations crop oils, perfect selectivity would be: that have not adopted hydrated silicas. Types of bleaching materials available include [136,139,140]: C18:3 C18:2 C18:1 Linolenic acid Linoleic acid Oleic acid Neutral earths: Basically hydrated aluminum silicates, sometimes called "natural clays" or "earths," and C18:0 fuller's earth, which vary in ability to absorb pigments. Stearic acid Acid-activated earths: Bentonites or montmorillonites, Although typical hydrogenation is not selective, it can be treated with hydrochloric or sulfuric acid to improve favored to a limited degree by selection of catalyst and by their absorption of pigments and other undesirable temperature and pressure of the process. Efficient hydro-components, are most commonly used. genation requires the cleanest possible feed stock (without Activated carbon: Expensive, more difficult to use, but of soaps, phosphatides, sulfur compounds, carbon monoxide, special interest for adsorbing polyaromatic hydrocar-nitrogen compounds, or oxygen-containing compounds) bons from coconut and fish oils. and the purest, driest hydrogen gas possible [140].“ In Handbook of Cereal Science and Technology, Revised and Expanded, 361–73. CRC Press, 2000. http://dx.doi.org/10.1201/9781420027228-35.

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Konferenzberichte zum Thema "HY synthesis"

Ayad, Zahraa, Hussein Q. Hussein und Ban A. Al-Tabbakh. „Synthesis and characterization of high silica HY zeolite by basicity reduction“. In 2ND INTERNATIONAL CONFERENCE ON MATERIALS ENGINEERING & SCIENCE (IConMEAS 2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0000278.

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Alam, T., Y. K. Krisnandi, W. Wibowo, D. A. Nurani, D. U. C. Rahayu und H. Haerudin. „Synthesis and characterization hierarchical HY zeolite using template and non template methods“. In PROCEEDINGS OF THE 3RD INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES 2017 (ISCPMS2017). Author(s), 2018. http://dx.doi.org/10.1063/1.5064091.

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Claus, M. P., I. R. Saragi und Y. K. Krisnandi. „Synthesis and characterization of Fe2O3/HY from kaolin as catalysts in the partial oxidation reaction of methane to methanol“. In PROCEEDINGS OF THE 5TH INTERNATIONAL SYMPOSIUM ON CURRENT PROGRESS IN MATHEMATICS AND SCIENCES (ISCPMS2019). AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0007905.

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