Alkylation of Toluene with tert-Butyl Alcohol over Different Zeolites with the Same Si/Al Ratio
Yuanyuan Wang, Hua Song, Yixian Han, Xinglong Sun, Jiaojing Zhang, Wenyi Wang, Xueqin Wang
Российский журнал прикладной химии
https://doi.org/10.1134/S1070427220070071
Three zeolites (Beta, Mordenite and ZSM-5), which present different pore channels but the same Si/Al ratio (25), were used as catalysts to investigate the effects of acidity and channel structure on the catalytic activity for toluene butylation at 180°C in an automated high-pressure stainless steel reactor. The same Si/Al ratio of the three zeolites did not result in a similar catalytic activity, since both acidity and channel structures of zeolites can affect catalytic activity. Zeolite Beta possessing a 3D 12-ring channel system, the smallest crystal size and larger amount of B acid sites exhibited the highest toluene conversion (54.0%). Mordenite, with 32.7% toluene conversion, presented higher para-selectivity than Beta, which can be explained by the shape-selective catalysis. ZSM-5 with the largest amount of B acid sites showed the lowest catalytic activity, since alkylation can occur only on the surface active sites.
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