Aromatic Transformations Over Mesoporous ZSM-5: Advantages and Disadvantages
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Abstract
Catalytic behavior of mesoporous ZSM-5 was investigated in toluene disproportionation, toluene alkylation with isopropyl alcohol, and p-xylene alkylation with isopropyl alcohol to understand the effect of the presence of mesopores. Three ZSM-5 zeolites (conventional one and two mesoporous differing in the mesopore volume) having similar Si/Al ratio were synthesized and characterized as for their acidity (internal and external) as well as their micropore/mesopore volume. No substantial differences among three samples were observed as for the type and concentration of Brønsted and Lewis acid sites as well as their location in zeolite channels or on external surface of zeolite crystals. Conversions of toluene and p-xylene increased with increasing volume of mesopores in ZSM-5 zeolite while the selectivity to individual products depended on the type of reaction. In general, selectivity to sum of xylenes in toluene disproportionation, sum of isopropyltoluenes in toluene alkylation and to 1-isopropyl-2,5-dimethylbenzene in p-xylene alkylation increased due to a shorter contact time molecules spent in mesoporous ZSM-5 catalysts. In contrast, para-selectivity decreased as diffusion pathways were shorten due to the presence of mesopores.
Keywords
Mesoporous ZSM-5 Alkylation Disproportionation Toluene p-Xylene Shape selectivityNotes
Acknowledgement
N.Ž. and J.Č. thank the Academy of Sciences of the Czech Republic for the financial support. S.E.P. thanks for financial support of Nano Center for Fine Chemical Fusion Technology from Industry and Energy Ministry of Commerce of Korea. The authors thank also Dr. L. Brabec and Dr. A. Zukal (J. Heyrovsky Institute) for recording SEM images and nitrogen isotherms, respectively.
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