Relevant bibliographies by topics / Catalyst. Al-MCM-41 mesoporous molecular sieves

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Academic literature on the topic 'Catalyst. Al-MCM-41 mesoporous molecular sieves'

Author: Grafiati
Published: 4 June 2021
Last updated: 14 February 2022

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Journal articles on the topic "Catalyst. Al-MCM-41 mesoporous molecular sieves"

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Zhou, Hua Feng, Yong Jin Yang, and Jin Son Zhang. "Catalytic Synthesis of Dioctyl Phthalate over Al-MCM-41 Molecular Sieves." Advanced Materials Research 306-307 (August 2011): 1741–46. http://dx.doi.org/10.4028/www.scientific.net/amr.306-307.1741.

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In this paper, mesoporous MCM-41 and Al-MCM-41(Si/Al =100, 70, 40, 10, 5) molecular sieves were synthesized by direct hydrothermal process and characterized by various analytical techniques. Their catalytic performance in the synthesis of dioctyl phthalate (DOP) was also studied. The results show that while keeping the mesostructure of Al-MCM-41(Si/Al=100, 70, 40), increasing Al content can increase the acidity and so forth effectively improve the catalytic activity. But too much aluminum incorporation can destroy the structure of Al-MCM-41(Si/Al=10). The Al-MCM-41 molecular sieves with proper
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Balcar, Hynek, Jan Sedláček, Jan Svoboda, Naděžda Žilková, Jiří Rathouský, and Jiří Vohlídal. "Hybrid Catalysts for Acetylenes Polymerization Prepared by Anchoring [Rh(cod)Cl]2 on MCM-41, MCM-48 and SBA-15 Mesoporous Molecular Sieves - The Effect of Support Structure on Catalytic Activity in Polymerization of Phenylacetylene and 4-Ethynyl-N-{4-[(trimethylsilyl)ethynyl]benzylidene}aniline." Collection of Czechoslovak Chemical Communications 68, no. 10 (2003): 1861–76. http://dx.doi.org/10.1135/cccc20031861.

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Hybrid catalysts for polymerization of acetylenes were prepared by anchoring, via (3-aminopropyl)trimethoxysilane linker, the [Rh(cod)Cl]2 complex on siliceous mesoporous molecular sieves differing in the pore size and architecture (MCM-41, MCM-48 and SBA-15). In comparison with [Rh(cod)Cl]2 used as homogeneous catalyst, all hybrid catalysts exhibited comparable or even higher catalytic activity in the polymerization of phenylacetylene and 4-ethynyl-N-{4-[(trimethylsilyl)ethynyl]benzylidene}aniline. The initial polymerization rate increased with increasing accessibility of mesoporous surface o
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Balcar, Hynek, Tushar Shinde, Naděžda Žilková, and Zdeněk Bastl. "Hoveyda–Grubbs type metathesis catalyst immobilized on mesoporous molecular sieves MCM-41 and SBA-15." Beilstein Journal of Organic Chemistry 7 (January 6, 2011): 22–28. http://dx.doi.org/10.3762/bjoc.7.4.

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A commercially available Hoveyda–Grubbs type catalyst (RC303 Zhannan Pharma) was immobilized on mesoporous molecular sieves MCM-41 and on SBA-15 by direct interaction with the sieve wall surface. The immobilized catalysts exhibited high activity and nearly 100% selectivity in several types of alkene metathesis reactions. Ru leaching was found to depend on the substrate and solvent used (the lowest leaching was found for ring-closing metathesis of 1,7-octadiene in cyclohexane – 0.04% of catalyst Ru content). Results of XPS, UV–vis and NMR spectroscopy showed that at least 76% of the Ru content
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Jung, Hun, Kwang Deog Jung, Oh Shim Joo, and Sun Jin Kim. "Synthesis and Catalytic Application of Mesoporous Molecular Sieves MCM-41 Containing Niobium and Tantalum." Solid State Phenomena 124-126 (June 2007): 1761–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.124-126.1761.

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Niobium- and tantalum-containing mesoporous molecular sieves MCM-41 have been synthesized, and applied as a catalyst for vapor phase Beckmann rearrangement of cyclohexanone oxime to ε-caprolactam. NbMCM-41 catalyst exhibited high catalytic performance in the vapor phase Beckmann rearrangement of cyclohexanone oxime. The oxime conversions were almost 100% and the lactam selectivities were around 80%. The lactam selectivities of NbMCM-41 catalyst were higher than those of AlMCM-41 catalyst. However, TaMCM-41 catalyst exhibited lower catalytic performance than AlMCM-41 catalyst, and it was fast d
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Liu, Wen Ming, Jia Jia Cao, Chun Ling Fan, and Zhao Ping Chen. "Synthesis and Catalytic Property of V-MCM-41 Mesoporous Molecular Sieves by Atrane Route." Advanced Materials Research 284-286 (July 2011): 936–39. http://dx.doi.org/10.4028/www.scientific.net/amr.284-286.936.

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V-MCM-41 molecular sieve with high vanadium content has been prepared by the atrane route. Gas phase partial oxidation of toluene to benzaldehyde on the V-MCM-41 molecular sieves catalysts was studied. The structure and characteristic of catalyst were characterized by means of XRD, UV-vis and so on. The experimental results showed that the vanadium content in the framework related to mole ratio of silica to vanadium. The vanadium content in the framework was the highest, when the mole ratio of Si to V was 30. And the vanadium in the framework may be active centers of catalytic oxidation of tol
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RAVAT, VILAS, and PREETI AGHALAYAM. "PALLDIUM SUPPORTED MCM-41 MESOPOROUS MOLECULAR SIEVES: SYNTHESIS, CHARACTERIZATION AND CATALYTIC TEST FOR THE REDUCTION OF NO BY CO." International Journal of Nanoscience 10, no. 04n05 (2011): 1051–56. http://dx.doi.org/10.1142/s0219581x11008563.

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Palladium supported MCM-41 molecular sieves with Si/Pd (molar) ratios of 400, 200, 100 and 50 were synthesized by hydrothermal method. All catalysts characterized by various analytical and spectroscopic techniques, viz, XRD, N2 sorption, TEM, DRUV-VIS, Raman. XRD at low angle and high angle studies suggest that the substitution of palladium and presence of palladium oxide phase in the silicate tetrahedral framework structure of MCM-41. TEM investigations confirm the highly ordered cubic structure with irregular distribution of palladium nanoparticles on surface PdMCM-41 . DRUV-VIS and Raman sp
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Bejblová, Martina, Josef Vlk, Dana Procházková, Helena Šiklová, and Jiří Čejka. "The Effect of Type of Acid Sites in Molecular Sieves on Activity and Selectivity in Acylation Reactions." Collection of Czechoslovak Chemical Communications 72, no. 5-6 (2007): 728–46. http://dx.doi.org/10.1135/cccc20070728.

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The role of the type of acid site (Broensted vs. Lewis) on the activity and selectivity of molecular sieve catalysts was investigated in ferrocene and toluene acylation. H-, Zn-, Fe-, Al- and La-forms of zeolite Beta, USY and mesoporous molecular sieves (Al)MCM-41, (Al)SBA-15 were tested. It was observed that addition of metal cations acting as Lewis acid sites can increase the acidity of various molecular sieve catalysts. No general relationship between the type of cation and conversion of individual substrate was found. While the highest activity in ferrocene acylation was observed after add
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Vetrivel, S., and A. Pandurangan. "Aerial oxidation of p-isopropyltoluene over manganese containing mesoporous MCM-41 and Al-MCM-41 molecular sieves." Journal of Molecular Catalysis A: Chemical 246, no. 1-2 (2006): 223–30. http://dx.doi.org/10.1016/j.molcata.2005.10.024.

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Liu, Zai Man, Pei Pei Deng, and Bai Yu Li. "Alkylation of p-Cresol with Isobutylene Catalyzed by Heteropoly Acid Supported on MCM-41 Catalyst." Advanced Materials Research 356-360 (October 2011): 2803–7. http://dx.doi.org/10.4028/www.scientific.net/amr.356-360.2803.

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The phosphorus tungsten(PW) heteropoly acids were immobilized on the mesoporous molecular sieves(MCM-41) by wet impregnation. The prepared catalysts were characterized by X-ray powder diffraction, TG and DTA,FTIR. The alkylation of p-cresol with isobutylene was carried out over the PW /MCM-41 catalysts. The influences of various reaction parameters such as reaction temperature, time, PW loading, and catalysts amount on the conversion of p-cresol and the products selectivity were also investigated. Under the optimized reaction conditions of 90 °C,PW loading of 10%, catalyst amount of 1.5%, p-cr
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Palani, A., and A. Pandurangan. "Esterification of terephthalic acid with methanol over mesoporous Al-MCM-41 molecular sieves." Journal of Molecular Catalysis A: Chemical 245, no. 1-2 (2006): 101–5. http://dx.doi.org/10.1016/j.molcata.2005.09.028.

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Dissertations / Theses on the topic "Catalyst. Al-MCM-41 mesoporous molecular sieves"

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Yiu, Humphrey Hak Ping. "The application of MCM-41 type mesoporous molecular sieves as heterogeneous acid catalysts and catalyst supports." Thesis, University of Huddersfield, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285629.

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Two types of mesoporous molecular sieves, MCM-41 and MMS, were prepared, fully characterised and tested as solid acid catalysts and catalyst support materials. Three different methods for characterising the surface acidity of these solid acids were examined and compared. These methods were 1. Fourier Transform infrared (FTIR) spectroscopy of adsorbed pyridine, 2. Pulsed ammonia adsorption using a combination of thermogravimetry and differential scanning calorimetry (TG/DSC), and 3. Temperature-programmed desorption of amines. The acidity results of these molecular sieves were compared with zeo
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Costa, Maria Jos? Fonseca. "S?ntese e caracteriza??o de materiais nanoporosos para pir?lise catal?tica de ?leos pesados." Universidade Federal do Rio Grande do Norte, 2008. http://repositorio.ufrn.br:8080/jspui/handle/123456789/17609.

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Made available in DSpace on 2014-12-17T15:41:45Z (GMT). No. of bitstreams: 1 MariaJFCpdf.pdf: 4931245 bytes, checksum: 45a7ea893d17f478c73adf56787579aa (MD5) Previous issue date: 2008-12-22<br>Coordena??o de Aperfei?oamento de Pessoal de N?vel Superior<br>The present work reports the study of nanoporous structures, aiming at their use in research directed to the current demand of the petroleum industry to value heavy oil. Initially, two ways were chosen for the synthesis of porous structures from the molecular sieves of type Si-MCM-41. In the first way, the structure MCM-41 is precursory for
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La, Salvia Nathália 1985. "Síntese e caracterização de MCM-41 impregnada com magnésio e cromo e suas propriedades catalíticas para reações de conversão de etanol." [s.n.], 2014. http://repositorio.unicamp.br/jspui/handle/REPOSIP/266085.

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Orientador: Gustavo Paim Valença<br>Tese (doutorado) - Universidade Estadual de Campinas, Faculdade de Engenharia Química<br>Made available in DSpace on 2018-08-24T23:01:25Z (GMT). No. of bitstreams: 1 LaSalvia_Nathalia_D.pdf: 7860896 bytes, checksum: 356f0e957d83d2daaba9cb36b26a4056 (MD5) Previous issue date: 2014<br>Resumo: Peneiras moleculares do tipo MCM-41 foram sintetizadas com e sem alumínio estrutural e impregnadas com 5% de magnésio e 5 e 10% de cromo. As amostras foram então calcinadas e caracterizadas, e utilizadas na conversão catalítica de etanol. Esses materiais foram caracteri
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MEDEIROS, Cláudia Dourado. "Desenvolvimento de Peneiras Moleculares MCM-41 E Al-MCM-41, via processo hidrotermal assistido por micro-ondas." Universidade Federal de Campina Grande, 2014. http://dspace.sti.ufcg.edu.br:8080/jspui/handle/riufcg/527.

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Submitted by Johnny Rodrigues (johnnyrodrigues@ufcg.edu.br) on 2018-04-30T16:37:00Z No. of bitstreams: 1 CLÁUDIA DOURADO MEDEIROS - DISSERTAÇÃO PPGEQ 2014..pdf: 1542895 bytes, checksum: 5a74f0ba9e6514c2859c363f528e0b6f (MD5)<br>Made available in DSpace on 2018-04-30T16:37:00Z (GMT). No. of bitstreams: 1 CLÁUDIA DOURADO MEDEIROS - DISSERTAÇÃO PPGEQ 2014..pdf: 1542895 bytes, checksum: 5a74f0ba9e6514c2859c363f528e0b6f (MD5) Previous issue date: 2014-04-02<br>Capes<br>As peneiras moleculares mesoporosas possuem um arranjo hexagonal de mesoporos com diâmetros de poros que variam de 2 a 10 nm
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Book chapters on the topic "Catalyst. Al-MCM-41 mesoporous molecular sieves"

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Nowak, I., B. Kilos, M. Ziolek, and J. C. Volta. "Structural and Textural Properties of MCM-41 Mesoporous Molecular Sieves Containing Nb, V, Mo — Alternative Catalysts for Hydrocarbons Oxidation." In NATO Science Series II: Mathematics, Physics and Chemistry. Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-3310-9_15.

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Ziolek, M., A. Michalska, P. Decyk, I. Nowak, J. Michalik, and J. Sadlo. "Alkali-resistance of MCM-41 mesoporous molecular sieves containing various T (Al, Si, Nb) elements." In Studies in Surface Science and Catalysis. Elsevier, 2004. http://dx.doi.org/10.1016/s0167-2991(04)80834-6.

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Hitz, S., A. Kogelbauer, B. Lindlar, and R. Prins. "Influence of pH adjustment on structure, stability, and catalytic activity of Al-MCM-41 mesoporous molecular sieves." In Studies in Surface Science and Catalysis. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)81033-1.

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Franke, O., J. Rathouský, G. Schulz-Ekloff, and A. Zukal. "Synthesis of MCM-41 mesoporous molecular sieves." In Studies in Surface Science and Catalysis. Elsevier, 1995. http://dx.doi.org/10.1016/s0167-2991(06)81767-2.

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Liepold, A., K. Roos, W. Reschetilowski, et al. "The nature of the acid sites in mesoporous MCM-41 molecular sieves." In Studies in Surface Science and Catalysis. Elsevier, 1997. http://dx.doi.org/10.1016/s0167-2991(97)80584-8.

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Ziolek, M., I. Nowak, P. Decyk, and J. Kujawa. "Synthesis and transformation of thiols and organic sulfides on MCM-41 mesoporous molecular sieves." In Studies in Surface Science and Catalysis. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)81031-8.

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Jong, Sung-Jeng, Jin-Fu Wu, Ajit R. Pradhan, Hong-Ping Lin, Chung-Yuan Mou, and Shang-Bin Liu. "Variable temperature 129Xe NMR studies of xenon adsorbed on mesoporous MCM-41 molecular sieves." In Studies in Surface Science and Catalysis. Elsevier, 1998. http://dx.doi.org/10.1016/s0167-2991(98)81036-7.

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Böhlmann, W., O. Klepel, D. Michel, and H. Papp. "Synthesis and characterization of In-MCM-41 mesoporous molecular sieves with different Si/In ratios." In Studies in Surface Science and Catalysis. Elsevier, 2002. http://dx.doi.org/10.1016/s0167-2991(02)80300-7.

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Ziolek, M., I. Nowak, I. Sobczak, and H. Poltorak. "Physico-chemical and catalytic properties of Ni-containing mesoporous molecular sieves of MCM-41 type." In Studies in Surface Science and Catalysis. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80936-2.

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Laha, S., P. Mukherjee, and R. Kumar. "07-P-23-Synthesis and characterization of mesoporous cerium silicate analogues of MCM-41 type molecular sieves." In Studies in Surface Science and Catalysis. Elsevier, 2001. http://dx.doi.org/10.1016/s0167-2991(01)81543-3.

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