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Influence of aluminum content, crystallinity and crystallite size of zeolite Pd/H-ZSM-5 on the catalytic performance in the dehydroalkylation of toluene with ethane

Bressel, Arne and Donauer, Thomas and Sealy, Sarah and Traa, Yvonne (2008) Influence of aluminum content, crystallinity and crystallite size of zeolite Pd/H-ZSM-5 on the catalytic performance in the dehydroalkylation of toluene with ethane. MICROPOROUS AND MESOPOROUS MATERIALS, 109 (1-3). pp. 278-286.

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Abstract

Pd/H-ZSM-5 zeolites with different aluminum contents and n(Si)/n(A1), ratios between 11 and 122, different crystallinities and crystallite sizes, including a nanocrystalline sample, were used as catalysts in the dehydroalkylation of toluene with ethane to the isomeric ethyltoluenes. This reaction was chosen as an industrially relevant test reaction for the non-oxidative activation of light alkanes. The catalysts were physicochemically characterized using X-ray diffractometry, scanning electron microscopy or dynamic light scattering, elemental analysis and H-1 MAS NMR spectroscopy. The catalytic experiments were carried out in a flow-through system and were analyzed with respect to the overall toluene conversion, the selectivities and yields to the desired ethyltoluene isomers and the formation of undesired byproducts. The catalytic results were compared to the results of the physicochemical characterization of the catalysts. The best catalyst was found to be Pd/H-ZSM-5 with a high crystallinity, a large crystal size and an intermediate n(Si)/n(A1), ratio around 40. (c) 2007 Elsevier Inc. All rights reserved.

Item Type:Article
Uncontrolled Keywords:non-oxidative activation of alkanes; alkylation of toluene; zeolite ZSM-5; aluminum content; nanocrystals
Subjects:Material Science > Functional and hybrid materials
ID Code:6158
Deposited By:IoN
Deposited On:04 Sep 2009 14:00
Last Modified:04 Sep 2009 14:00

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