Abstract

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.

中文翻译：

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相同硅铝比的不同沸石上甲苯与叔丁基醇的烷基化

摘要

使用三种沸石（β，丝光沸石和ZSM-5），它们具有不同的孔道但相同的Si / Al比（25）作为催化剂，研究酸度和通道结构对180℃下甲苯丁基化催化活性的影响。 °C在自动高压不锈钢反应器中。三种沸石的相同Si / Al比不会导致相似的催化活性，因为沸石的酸性和通道结构都会影响催化活性。Beta沸石具有3D 12环通道系统，最小的晶体尺寸和大量的B酸位点表现出最高的甲苯转化率（54.0％）。丝光沸石，以32.7％的甲苯转化率，较高的呈现第选择性比β高，这可以通过形状选择性催化来解释。具有最多B酸位的ZSM-5表现出最低的催化活性，因为烷基化只能发生在表面活性位上。