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Journal articles on the topic 'Molecular sieves and catalysts'

Author: Grafiati

Published: 4 June 2021

Last updated: 6 February 2022

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1

Brand, Stephen K., Joel E. Schmidt, Michael W. Deem, et al. "Enantiomerically enriched, polycrystalline molecular sieves." Proceedings of the National Academy of Sciences 114, no. 20 (2017): 5101–6. http://dx.doi.org/10.1073/pnas.1704638114.

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Zeolite and zeolite-like molecular sieves are being used in a large number of applications such as adsorption and catalysis. Achievement of the long-standing goal of creating a chiral, polycrystalline molecular sieve with bulk enantioenrichment would enable these materials to perform enantioselective functions. Here, we report the synthesis of enantiomerically enriched samples of a molecular sieve. Enantiopure organic structure directing agents are designed with the assistance of computational methods and used to synthesize enantioenriched, polycrystalline molecular sieve samples of either ena

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2

Borgschulte, A., E. Callini, N. Stadie, et al. "Manipulating the reaction path of the CO2 hydrogenation reaction in molecular sieves." Catalysis Science & Technology 5, no. 9 (2015): 4613–21. http://dx.doi.org/10.1039/c5cy00528k.

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We demonstrate that the kinetics of the Sabatier reaction catalysed by sorption catalysts depends on the nanostructure of the catalyst–sorbent system, and in particular on the shape selectivity of the zeolite sorbent.

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3

Grunewald, Gerald C., and Russell S. Drago. "Carbon molecular sieves as catalysts and catalyst supports." Journal of the American Chemical Society 113, no. 5 (1991): 1636–39. http://dx.doi.org/10.1021/ja00005a029.

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4

Sheldon, Roger A., Isabel W. C. E. Arends, and Hans E. B. Lempers. "Activities and Stabilities of Redox Molecular Sieve Catalysts in Liquid Phase Oxidations. A Review." Collection of Czechoslovak Chemical Communications 63, no. 11 (1998): 1724–42. http://dx.doi.org/10.1135/cccc19981724.

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The use of redox molecular sieves as heterogeneous catalysts for liquid phase oxidations with H2O2 and alkyl hydroperoxides is reviewed. Emphasis is placed on titanium- and chromium-substituted molecular sieves as examples of catalysts operating via peroxometal and oxometal pathways, respectively. Various titanium-substituted molecular sieves were shown to be stable, heterogeneous catalysts for, e.g., olefin epoxidation, but the remarkable activity of the progenitor of this family of catalysts, titanium-silicalite (TS-1), has not been equalled. The catalytic activity of chromium-substituted mo

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5

Zhao, Hao, Zhaoping Zhong, Zhaoying Li, and Wei Wang. "Research on catalytic pyrolysis of algae based on Py-GC/MS." Royal Society Open Science 6, no. 11 (2019): 191307. http://dx.doi.org/10.1098/rsos.191307.

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In order to improve the quality of catalysis products of algae, composite molecular sieve catalyst was prepared by digestion and crystallization of HZSM-5 to reduce the oxygen content of the catalytic products. According to the analysis of the pyrolysis products, the best preparation conditions were chosen of tetra propylammonium hydroxide (TPAOH) solution 2.0 mol l −1 , cetyltrimethylammonium bromide (CTAB) solution 10 wt%, crystallization temperature 110°C, digestion–crystallization time: 24–24 h. The results indicate that the main function of catalysts is to promote the conversion of alcoho

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6

Choi-Feng, C., J. B. Hall, B. J. Huggins, et al. "Structural study of deactivation of gallosilicate catalysts." Proceedings, annual meeting, Electron Microscopy Society of America 51 (August 1, 1993): 726–27. http://dx.doi.org/10.1017/s0424820100149465.

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Gallosilicate molecular sieves with an MFI structure are very promising catalysts for upgrading light olefins and paraffins to aromatics. Gallosilicate catalysts are quite stable at low reaction temperature, however, when subjected to high temperature, gallosilicate catalysts deactivate rapidly. The activity and selectivity of these catalysts are greatly influenced by both framework and non-framework gallium. Although the framework gallium imparts acidity to the sieve, the nature of the non-framework gallium is unclear. In the present study, combined techniques of analytical electron microscop

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7

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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8

AGRAWAL, A., S. CHANDRA SHEKAR, R. TOMAR, and S. GUJARATHI. "CATALYTIC DEGRADATION OF ETHYL ACETATE OVER V2O5 SUPPORTED MOLECULAR SIEVES." Latin American Applied Research - An international journal 45, no. 4 (2015): 225–29. http://dx.doi.org/10.52292/j.laar.2015.402.

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Series of V2O5 molecular sieves catalysts with varying vanadium content are prepared by impregnation method. The catalyst composition is determined by AAS, SEM, TPR, XRD and BET Surface area techniques. Ethyl acetate decomposition studies are conducted over V/mol sev catalyst with varying vanadium content in presence of air and ozone in a temperature range of 120 to 180°C. The results reveal that in presence of air the oxidation activity is marginal and the principal oxidation product is ethanol. Whereas in presence of ozone, the oxidation activity is increased significantly, and the primary p

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9

Zabicky, Jacob, Ignat Eger, Arjeh Galun, and Moshe Mhasalkar. "Molecular sieves as catalysts for aromatic bromination." Zeolites 7, no. 6 (1987): 499–502. http://dx.doi.org/10.1016/0144-2449(87)90086-8.

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10

Buluchevskiy, E. A., T. R. Karpova, L. F. Sayfulina, and A. V. Lavrenov. "Direct Synthesis of Propylene from Ethylene: catalysts and process es." Российский химический журнал 62, no. 1-2 (2019): 110–16. http://dx.doi.org/10.6060/rcj.2018621-2.8.

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Promising technologies for a one-stage production of propylene from ethylene were considered. The basic types of catalysis systems used as heterogeneous catalysts for the one-stage production of propylene from ethylene were presented. These are zeolites, silicoaluminophosphates, mesoporous molecular sieves, nickel-, tungsten-, molybdenum- and rhenium-containing catalysts.

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11

Dědeček, Jiří, Alena Vondrová, and Jiří Čejka. "Catalytic Activity of Cu Ion-Exchanged Metalloaluminophosphates in NO Decomposition." Collection of Czechoslovak Chemical Communications 63, no. 11 (1998): 1755–68. http://dx.doi.org/10.1135/cccc19981755.

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NO decomposition was investigated over Cu ion-exchanged aluminophosphate molecular sieve catalysts. Cu ions in cationic positions balanced by one framework negative charge in the metalloaluminophosphates of AlPO-5 and AlPO-11 structures exhibited catalytic activity in NO decomposition comparable with that of Cu-ZSM-5. No catalytic activity of the Cu ions incorporated during synthesis of molecular sieves into the framework in tetrahedral positions (CuAlPO-11) was observed. The catalytic activity of Cu-MeAlPO-5 and Cu-MeAlPO-11 was observed with various divalent metal ions of the MeAlPO-5 and Me

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12

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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13

Li, Jiyang, Jihong Yu, and Ruren Xu. "Progress in heteroatom-containing aluminophosphate molecular sieves." Proceedings of the Royal Society A: Mathematical, Physical and Engineering Sciences 468, no. 2143 (2012): 1955–67. http://dx.doi.org/10.1098/rspa.2012.0058.

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Over the past 30 years, heteroatom-containing aluminophosphate molecular sieves as a prime class of heterogeneous single-site solid catalysts have been quickly developed since the first discovery of aluminophosphate molecular sieves in 1982, and a large variety of such materials with 48 unique zeotype structures have been prepared. This work mainly presents the progress in the development of heteroatom-containing aluminophosphate molecular sieves with new zeolite structures and variable framework compositions in recent years.

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14

Wang, Yanfei, Zhihua Zhang, and Xuli Zhai. "Ideal Hydrocracking Catalysts Based on Microporous Molecular Sieves." Current Catalysis 4, no. 1 (2015): 31–42. http://dx.doi.org/10.2174/2211544704666141231191324.

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15

Davis, Mark E. "Zeolites and molecular sieves: not just ordinary catalysts." Industrial & Engineering Chemistry Research 30, no. 8 (1991): 1675–83. http://dx.doi.org/10.1021/ie00056a001.

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16

Jones, Christopher W., Katsuyuki Tsuji, and Mark E. Davis. "Organic-functionalized molecular sieves as shape-selective catalysts." Nature 393, no. 6680 (1998): 52–54. http://dx.doi.org/10.1038/29959.

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17

Ma, Mingxuan, Xiaoyu Ma, Suping Cui, Tingting Liu, Yingliang Tian, and Yali Wang. "Low Temperature NH3-SCR over Mn-Ce Oxides Supported on MCM-41 from Diatomite." Materials 12, no. 22 (2019): 3654. http://dx.doi.org/10.3390/ma12223654.

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A series of MCM-41 molecular sieves with different molar ratio of template to silicon were synthesized through hydrothermal synthesis method by using cetyltrimethylammonium bromide (CTAB) as the template, diatomite as the silicon source. By using impregnation method, the Mn-Ce/MCM-41 SCR molecular sieve-based catalysts were prepared. The results observed that when the molar ratio of template to silicon was 0.2:1, the MCM-41 as catalyst carrier has the highest surface area and largest pore volume, it also presented typically ordered hexagonal arrays of uniform channels. The denitration catalyti

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18

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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19

Hell, Zoltán, Ágnes Magyar, and Kinga Juhász. "The Application of 4Å Molecular Sieves in Organic Chemical Syntheses: An Overview." Synthesis 53, no. 02 (2020): 279–95. http://dx.doi.org/10.1055/s-0040-1706535.

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AbstractIn the last two decades, considerable attention has been devoted to the use of 4Å molecular sieves (MS 4A) in organic chemical syntheses. Initially, they were applied as drying agents in order to dry gases, solvents and liquid reagents. Nowadays, there is a growing tendency to apply MS 4A as an additive, catalyst, co-catalyst or catalyst support in organic reactions. In this review, we aim to summarize the recent examples of organic syntheses promoted by MS 4A from 1997 to 2020. We hope to provide the reader with an overview of the potential of MS 4A in the field of organic synthesis.1

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20

Dubé, David, Sébastien Royer, Do Trong On, François Béland, and Serge Kaliaguine. "Aluminum chloride grafted mesoporous molecular sieves as alkylation catalysts." Microporous and Mesoporous Materials 79, no. 1-3 (2005): 137–44. http://dx.doi.org/10.1016/j.micromeso.2004.11.002.

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21

Chou, Berryinne, Jai-Long Tsai, and Soofin Cheng. "Cu-substituted molecular sieves as liquid phase oxidation catalysts." Microporous and Mesoporous Materials 48, no. 1-3 (2001): 309–17. http://dx.doi.org/10.1016/s1387-1811(01)00347-x.

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22

MU, Xuhong, Dianzhong WANG, Yongrui WANG, Min LIN, Shibiao CHENG, and Xingtian SHU. "Nanosized molecular sieves as petroleum refining and petrochemical catalysts." Chinese Journal of Catalysis 34, no. 1 (2013): 69–79. http://dx.doi.org/10.1016/s1872-2067(11)60462-2.

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23

Pastore, H. O., S. Coluccia, and L. Marchese. "POROUS ALUMINOPHOSPHATES :From Molecular Sieves to Designed Acid Catalysts." Annual Review of Materials Research 35, no. 1 (2005): 351–95. http://dx.doi.org/10.1146/annurev.matsci.35.103103.120732.

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24

DAVIS, M. E., and J. B. HIGGINS. "ChemInform Abstract: Zeolites and Molecular Sieves (Characterization as Catalysts)." ChemInform 24, no. 32 (2010): no. http://dx.doi.org/10.1002/chin.199332283.

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25

Dai, Pei-Shing E., Randall H. Petty, Conrad W. Ingram, and R. Szostak. "Metal substituted aluminophosphate molecular sieves as phenol hydroxylation catalysts." Applied Catalysis A: General 143, no. 1 (1996): 101–10. http://dx.doi.org/10.1016/0926-860x(96)00073-7.

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26

Kowalak, Stanisłav, and Kenneth J. Balkus. "AlPO4 Molecular Sieves Modified with Metal Chelate Complexes." Collection of Czechoslovak Chemical Communications 57, no. 4 (1992): 774–80. http://dx.doi.org/10.1135/cccc19920774.

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A new method for modification AlPO4 molecular sieves has been presented. Lack of ion-exchange properties makes the modification of aluminium phosphates for catalytic applications difficult. We have developed a method that involves the crystallization of AlPO4 molecular sieves around metal complexes. This results in encapsulation of the complexes within the intracrystalline pore system. Several metallophthalocyanines have been successfully encapsulated into AlPO4-5 and subsequently tested as catalysts for cyclohexene oxidation. Significant differences in activity result from the presence of dif

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27

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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28

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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29

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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30

Yarmo, Mohd Ambar, Raja Saadiah Raja Shariff, Siti Rohaya Omar, Juan Joon Ching, and Roziana Haron. "New Perspective in Recent Solid Acid Catalyst." Materials Science Forum 517 (June 2006): 117–22. http://dx.doi.org/10.4028/www.scientific.net/msf.517.117.

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This paper will review on the latest development on solid acid catalysts used in industries as well in research activities. Application of heterogeneous acid catalysis becomes current trend for many industries due to world wide environmental concern. Conventional synthetic or natural zeolites widely used for petrochemical processing, has some limitation because its pore size is normally smaller than reactant molecules. To overcome this challenge new delaminated zeolite process was introduced. In this process specific synthetic zeolite (i.e. ferrierite) was swelled up using specific surfactant

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31

Balcar, Hynek, and Jiří Čejka. "Mesoporous Molecular Sieves as Advanced Supports for Olefin Metathesis Catalysts." Macromolecular Symposia 293, no. 1 (2010): 43–47. http://dx.doi.org/10.1002/masy.200900043.

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32

JONES, C. W., K. TSUJI, and M. E. DAVIS. "ChemInform Abstract: Organic-Functionalized Molecular Sieves as Shape-Selective Catalysts." ChemInform 29, no. 33 (2010): no. http://dx.doi.org/10.1002/chin.199833047.

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33

DAVIS, M. E. "ChemInform Abstract: Zeolites and Molecular Sieves: Not Just Ordinary Catalysts." ChemInform 22, no. 48 (2010): no. http://dx.doi.org/10.1002/chin.199148324.

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34

Balcar, H., and J. Čejka. "Mesoporous molecular sieves as advanced supports for olefin metathesis catalysts." Coordination Chemistry Reviews 257, no. 21-22 (2013): 3107–24. http://dx.doi.org/10.1016/j.ccr.2013.07.026.

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35

Maheswari, R., K. Shanthi, T. Sivakumar, and Sankarasubbier Narayanan. "Mesoporous molecular sieves." Applied Catalysis A: General 245, no. 2 (2003): 221–30. http://dx.doi.org/10.1016/s0926-860x(02)00642-7.

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36

Sundaramurthy, V., I. Eswaramoorthi, and N. Lingappan. "The catalytic effect of boron substitution in MCM-41-type molecular sieves." Canadian Journal of Chemistry 82, no. 5 (2004): 631–40. http://dx.doi.org/10.1139/v04-017.

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A series of B-MCM-41 samples has been synthesized with a wide range of boron content (SiO2:B2O3 ratio from 20 to 200), using ethyl silicate ester-40 (ES-40) as the silica source and characterized by XRD, BET, FT-IR, 11B-MAS NMR, SEM, pyridine adsorption, TPDA, and chemical analysis. The interplanar d100 spacing varies from 40 to 45 Å, depending on the Si:B ratio. On calcination, a significant amount of four-coordinated boron is converted into less stable three-coordinated boron, and some boron is removed from the framework. The degree of deboronation increases with an increase of boron content

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37

Esther Leena Preethi, M., A. Umasankari, C. H.Rekha, M. Palanichamy, T. Sivakumar, and A. Pandurangan. "Selective Oxidation of Cyclohexane to KA Oil Over Ce-Alpo-18 Molecular Sieves." International Journal of Engineering & Technology 7, no. 4.5 (2018): 352. http://dx.doi.org/10.14419/ijet.v7i4.5.20105.

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The novel catalysts Ce-AlPO-18 with Al/Ce = 25, 50, 75 &100 were synthesized using hydrothermal synthesis procedure. The newly synthesized catalysts were characterized using physico-chemical techniques such as, X-ray diffraction (XRD) which confirmed AEI structure, diffuse reflectance spectroscopy (DRS-UV) confirmed the presence of both Ce3+ and Ce4+ in the framework and Fourier transform infrared spectroscopy (FT-IR) confirmed the complete removal of template molecule. The synthesized catalysts were tested for the oxidation of cyclohexane using air as the oxidant in a solvent free system

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38

Yu, Yuehong, Jiaxiang Qin, Min Xiao, Shuanjin Wang, Dongmei Han, and Yuezhong Meng. "Performance Enhanced SAPO-34 Catalyst for Methanol to Olefins: Template Synthesis Using a CO2-Based Polyurea." Catalysts 9, no. 1 (2018): 16. http://dx.doi.org/10.3390/catal9010016.

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Introducing mesopores into the channels and cages of conventional micropores CHA (Chabazite) topological structure SAPO-34 molecular sieves can effectively improve mass transport, retard coke deposition rate and enhance the catalytic performance for methanol to olefins (MTO) reaction, especially lifetime and olefins selectivity. In order to overcome the intrinsic diffusion limitation, a novel CO2-based polyurea copolymer with affluent amine group, ether segment and carbonyl group has been firstly applied to the synthesis of SAPO-34 zeolite under hydrothermal conditions. The as-synthesized micr

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39

Balcar, Hynek, Naděžda Žilková, Martin Kubů, Michal Mazur, Zdeněk Bastl, and Jiří Čejka. "Ru complexes of Hoveyda–Grubbs type immobilized on lamellar zeolites: activity in olefin metathesis reactions." Beilstein Journal of Organic Chemistry 11 (November 4, 2015): 2087–96. http://dx.doi.org/10.3762/bjoc.11.225.

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Hoveyda–Grubbs type catalysts with cationic tags on NHC ligands were linker-free immobilized on the surface of lamellar zeolitic supports (MCM-22, MCM-56, MCM-36) and on mesoporous molecular sieves SBA-15. The activity of prepared hybrid catalysts was tested in olefin metathesis reactions: the activity in ring-closing metathesis of citronellene and N,N-diallyltrifluoroacetamide decreased in the order of support MCM-22 ≈ MCM-56 > SBA-15 > MCM-36; the hybrid catalyst based on SBA-15 was found the most active in self-metathesis of methyl oleate. All catalysts were reusable and exhibited low

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40

Marinho, Janaína C., Tellys L. A. Barbosa, and Meiry Gláucia Freire Rodrigues. "Preparation of Molecular Sieve Al-SBA-15 with Two Ratios Si/Al Catalyst for Use in the Transesterification Reaction of Soybean Oil." Materials Science Forum 912 (January 2018): 39–43. http://dx.doi.org/10.4028/www.scientific.net/msf.912.39.

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Molecular sieves have been applied to the triacylglycerides processing in the production of biodiesel through transesterification reaction. The purpose of obtain a material that has characteristics favorable to higher biodiesel conversion, this paper aims to synthesize molecular sieves SBA-15 and Al-SBA-15 on two reasons Si/Al (Si/Al= 10 and 100) evaluated in the transesterification reaction of soybean oil and investigate the potential of Si/Al ratios in the reaction over the acid each material. The catalysts were prepared by conventional hydrothermal method by varying the composition of the a

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41

Endud, Salasiah, Nurliana Roslan, Zainab Ramli, and Hendrik O. Lintang. "Titanium Containing Aluminophosphate Molecular Sieve for Oxidation of Styrene." Advanced Materials Research 1109 (June 2015): 360–64. http://dx.doi.org/10.4028/www.scientific.net/amr.1109.360.

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Microporous aluminophosphate (AlPO-5) and titanium aluminophosphate (TAPO-5) molecular sieves, which are zeolite-like materials have been synthesized by direct hydrothermal method using two different templates; triethylamine (TEA) as organic base and tetraethylammonium hydroxide (TEAOH) as alkali base. XRD patterns confirmed that the TAPO-5 catalysts are identical with AFI structure but the crystallinity of the catalysts had decreased after the incorporation of titanium into the framework. Besides that, characterization of TAPO-5 catalysts using DRUV-Vis confirmed the coordination of titanium

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42

Shi, Chunwei, Xue Bian, Yongfu Wu, Yufeng Cong, and Mingyuan Pei. "Catalytic Synthesis of n-Butyl Oleate by Cerium Complex Doped Y/SBA-15 Composite Molecular Sieve." High Temperature Materials and Processes 37, no. 2 (2018): 107–11. http://dx.doi.org/10.1515/htmp-2016-0125.

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AbstractCerium ion was successfully incorporated into Y/SBA-15 micro-mesoporous molecular sieves via the hydrothermal synthesis method to give a series of composite materials. The prepared materials were thoroughly characterized using Fourier transform infrared spectroscopy (FT-IR), X-ray fluorescence spectroscopy (XRF), scanning electron microscopy-energy dispersive spectroscopy (SEM-EDS) and differential thermo gravimetric analysis (TG-DTG). The results showed that the prepared composite materials retained the highly ordered mesoporous two-dimensional hexagonal structure of SBA-15 and the oc

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43

Sayari, Abdelhamid. "Catalysis by Crystalline Mesoporous Molecular Sieves." Chemistry of Materials 8, no. 8 (1996): 1840–52. http://dx.doi.org/10.1021/cm950585+.

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Hsien, M. "Fe-substituted molecular sieves as catalysts in liquid phase pinacol rearrangement." Journal of Molecular Catalysis A: Chemical 181, no. 1-2 (2002): 189–200. http://dx.doi.org/10.1016/s1381-1169(01)00382-x.

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Yin, Donghong, Wenhuai Li, Wenshu Yang, et al. "Mesoporous HMS molecular sieves supported cobalt catalysts for Fischer–Tropsch synthesis." Microporous and Mesoporous Materials 47, no. 1 (2001): 15–24. http://dx.doi.org/10.1016/s1387-1811(01)00322-5.

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Yang, Y., Z. Hu, Y. N. Lü, and Y. Chen. "Growth of carbon nanotubes with metal-loading mesoporous molecular sieves catalysts." Materials Chemistry and Physics 82, no. 2 (2003): 440–43. http://dx.doi.org/10.1016/s0254-0584(03)00282-7.

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KUYPER, J. "Hexacyanometallate salts used as alkene-oxide polymerization catalysts and molecular sieves." Journal of Catalysis 105, no. 1 (1987): 163–74. http://dx.doi.org/10.1016/0021-9517(87)90016-9.

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Ulan, J., R. Szostak, and R. Gronsky. "Characterization of aluminophosphates: Identification of 18-member ring structure in AlPO4-8." Proceedings, annual meeting, Electron Microscopy Society of America 48, no. 4 (1990): 292–93. http://dx.doi.org/10.1017/s042482010017459x.

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The first claim in 1987 of an aluminophosphate (VPI-5) with a pore diameter greater than 7 Å regenerated interest in ultra-large pore molecular sieves for which theoretical models have existed since 1969. Large micropore materials are needed, especially in the oil industry, as catalysts which have the high acidity of zeolites, are thermally stable at high temperatures and pressures, and have significant porosity to allow diffusion of heavier feedstocks currently being seen in refineries.The aluminophosphate VPI-5 is reported to be the first molecular sieve to contain an 18-member ring structur

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49

Al-Ani, Aqeel, Josiah J. C. Haslam, Natalie E. Mordvinova, et al. "Synthesis of nanostructured catalysts by surfactant-templating of large-pore zeolites." Nanoscale Advances 1, no. 5 (2019): 2029–39. http://dx.doi.org/10.1039/c9na00004f.

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Zeolites and related crystalline molecular sieves are utilised in a wide range of reactions and processes due to their regular microporous structure, strong acidity, shape selectivity and ion-exchange properties.

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Ratnasamy, Paul, Robert Raja, and Darbha Srinivas. "Novel, benign, solid catalysts for the oxidation of hydrocarbons." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 363, no. 1829 (2005): 1001–12. http://dx.doi.org/10.1098/rsta.2004.1538.

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The catalytic properties of two classes of solid catalysts for the oxidation of hydrocarbons in the liquid phase are discussed: (i) microporous solids, encapsulating transition metal complexes in their cavities and (ii) titanosilicate molecular sieves. Copper acetate dimers encapsulated in molecular sieves Y, MCM-22 and VPI-5 use dioxygen to regioselectively ortho -hydroxylate l -tyrosine to l -dopa, phenol to catechol and cresols to the corresponding o -dihydroxy and o -quinone compounds. Monomeric copper phthalocyanine and salen complexes entrapped in zeolite-Y oxidize methane to methanol, t

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