Journal
JOURNAL OF CATALYSIS
Volume 311, Issue -, Pages 271-280Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2013.12.003
Keywords
Toluene methylation; Mesoscopically structured H-ZSM5; Methanol conversion; p-Xylene selectivity; Acid chemistry in zeolites
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Funding
- Ministry of Higher Education, Saudi Arabia of the Center of Research Excellence in Petroleum Refining and Petrochemicals at King Fahd University of Petroleum and Minerals (KFUPM)
- Deutsche Forschungsgemeinschaft (DFG) [JE 260-10/1]
- Fonds der Chemischen Industrie
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Mesoscopically structured zeolites based on H-ZSM5 were designed and synthesized as highly active and shape selective catalysts for methylation of toluene by tuning diffusion and acid site concentration of the catalysts. This was achieved by combining desilication, subsequent dealumination and chemical deposition of a mesoporous SiO2 overlayer of several nanometer thickness. The decreasing effective diffusion length in zeolite crystals achieved by desilication and dealumination increased the turnover rate of toluene by favoring activation of methanol and facilitating desorption of the produced xylenes, albeit with some loss in p-xylene selectivity. The presence of the SiO2 overlayer increased the p-xylene selectivity by enhancing the tortuosity of the zeolite, randomly blocking pore openings at the surface, and increasing the effective diffusion path length. The final material combines the higher catalyst utilization with enhanced selectivity leading to rates comparable to the parent zeolite, but at significantly higher selectivity. (C) 2013 Elsevier Inc. All rights reserved.
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