Catalytic properties of heteropoly acid/zeolite hybrid materials: toluene disproportionation and transalkylation with 1,2,4-trimethylbenzene

Sulikowski, Bogdan; Rachwalik, R.

doi:10.1016/s0926-860x(03)00397-1

Cited by 41 publications

(30 citation statements)

References 22 publications

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“…Sulikowski also prepared samples by impregnation of the same dealuminated zeolite with HPW 12 in diethyl ether [38]. The mixture was stirred in a closed vessel at room temperature for 1.5 h and then the solid was isolated by filtration and washed with diethyl ether.…”

Section: Preliminary Studiesmentioning

confidence: 99%

Synthesis, Characterization and Applications in Catalysis of Polyoxometalate/Zeolite Composites

Lefèbvre

2016

Inorganics

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An overview of the synthesis, characterization and catalytic applications of polyoxometalates/zeolites composites is given. The solids obtained by direct synthesis of the polyoxometalate in the presence of the zeolite are first described with their applications in catalysis. Those obtained by a direct mixing of the two components are then reviewed. In all cases, special care is taken in the localization of the polyoxometalate, inside the zeolite crystal, in mesopores or at the external surface of the crystals, as deduced from the characterization methods.

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Section: Preliminary Studiesmentioning

confidence: 99%

Synthesis, Characterization and Applications in Catalysis of Polyoxometalate/Zeolite Composites

Lefèbvre

2016

Inorganics

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“…Cerca de 40% das plantas industriais de etilbenzeno, em nível mundial, emprega o processo de alquilação de Friedel-Crafts, baseado em catalisadores à base de cloreto de alumínio, implementado comercialmente na década de 50 1 . Entretanto, nos últimos vinte anos, os custos operacionais associados à corrosividade do cloreto de alumí-nio e os problemas de manuseio e descarte desse catalisador motivaram os fabricantes a buscarem processos alternativos, empregando catalisadores ácidos sólidos 1,[3][4][5] . As vantagens desses materiais, em relação aos ácidos líquidos, são a diminuição do risco de corrosão e a eliminação de problemas ambientais 6 .…”

Section: Introductionunclassified

“…Entre os diversos catalisadores estudados, as zeólitas mostraram-se como os mais promissores, sendo empregadas em vários processos industriais, tais como aqueles implantados pelas empresas Mobil-Badger e Lummus-UOP, denominados de EbMax ("Ethylbenzene Production and Maximization") e Lummus-UOP ("Lummus UOP and Mobil Process Xylene and Ethylbenzene Production from Toluene-PXPLUS"), respectivamente 2 . Estes sistemas apresentam as vantagens de serem facilmente manuseados e poderem ser empregados em processos simples e versáteis, permitindo uma fácil regeneração do catalisador e a eliminação de problemas como a corrosão e os riscos ambientais 2,5 . Dessa forma, vários novos catalisadores, assim como diversos processos alternativos, foram propostos para plantas industriais baseadas em reações de transalquilação 1,3,7,8 .…”

Section: Introductionunclassified

“…Dessa forma, vários novos catalisadores, assim como diversos processos alternativos, foram propostos para plantas industriais baseadas em reações de transalquilação 1,3,7,8 . A transalquilação é um processo de conversão de compostos aromáticos, por reações de transferência de grupos alquílicos, através do mecanismo de formação de íons carbônio, como mostram as Equações 1 e 2 1,5,7,8 .…”

Section: Introductionunclassified

“…Essas reações ocorrem em presença de hidrogênio e são catalisadas por diversos materiais, tais como óxidos inorgânicos e zeólitas 1,5,7,8 . Estes últimos são os mais empregados devido às suas características texturais, que facilitam o acesso dos reagentes aos poros, além da seletividade de forma, que aumenta o rendimento do processo.…”

Section: Introductionunclassified

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Efeito do cromo nas propriedades catalíticas da MCM-41

Oliveira¹,

Rangel²,

Fierro³

et al. 2005

Quím. Nova

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Recebido em 5/1/04; aceito em 11/8/04; publicado na web em 12/11/04 THE EFFECT OF CHROMIUM ON THE CATALYTIC PROPERTIES OF MCM-41. The effect of chromium on the catalytic properties of MCM-41 was evaluated in order to develop new catalysts for the trimethylbenzene transalkylation with benzene to produce ethylbenzene, a high-value aromatic in the industry. It was found that chromium decreases the specific surface area but increases the acidity, turning MCM-41 into an active and selective catalyst for ethylbenzene and toluene production. The coke produced on the catalyst is hydrogenated and mainly located outside the pores and thus can be easily removed. The catalyst is more active and selective than mordenite, a commercial catalyst, and thus more promising for commercial applications.

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Novel Gallium Polyoxometalate/Nano‐Gold Hybrid Material Supported on Nano‐sized Silica for Mild Cyclohexene Oxidation Using Molecular Oxygen

Jameel

Chen

et al. 2017

Bulletin Korean Chem Soc

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Selective oxidation of olefins using molecular oxygen is a great challenge. This study reports two types of novel eco‐friendly heterogeneous hybrid catalysts. One comprises of a lacunary Keggin‐type polyoxometalate (POM) GaW11 linked to nano‐sized silica using (3‐aminopropyl) triethoxysilane (APTES) to form GaW11‐APTES@SiO2 . Another catalyst is Au/GaW11‐APTES@SiO2 prepared by wet deposition of nano‐gold on the former one. The catalysts were characterized and used for the solvent‐free oxidation of cyclohexene with molecular oxygen under mild reaction conditions. Both the catalysts showed good conversion and significant selectivity towards oxidized products for cyclohexene. GaW11‐APTES@SiO2 showed a high conversion of up to 62.02% with a selectivity of 59.13% towards epoxide at a mild temperature of 50°C. Au/GaW11‐APTES@SiO2 showed a conversion of 69.32% with 57.34% selectivity to 2‐cyclohexene‐1‐ol at a temperature of 80°C. The heterogeneous catalysts were reused several times with no significant loss in conversion or selectivity towards the oxidized products.

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Catalytic properties of heteropoly acid/zeolite hybrid materials: toluene disproportionation and transalkylation with 1,2,4-trimethylbenzene

Cited by 41 publications

References 22 publications

Synthesis, Characterization and Applications in Catalysis of Polyoxometalate/Zeolite Composites

Synthesis, Characterization and Applications in Catalysis of Polyoxometalate/Zeolite Composites

Efeito do cromo nas propriedades catalíticas da MCM-41

Novel Gallium Polyoxometalate/Nano‐Gold Hybrid Material Supported on Nano‐sized Silica for Mild Cyclohexene Oxidation Using Molecular Oxygen

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