催化作用
化学
布朗斯特德-洛瑞酸碱理论
沸石
催化裂化
戒指(化学)
碳氢化合物
类型(生物学)
有机化学
地质学
古生物学
作者
Hiroto Toyoda,Ryota Osuga,Yong Wang,Sung-Sik Park,Koji Yazawa,Hermann Gies,Christopher J. Gilbert,Bilge Yilmaz,C. P. Kelkar,Toshiyuki Yokoi
摘要
MSE-type zeolites synthesized by different organic structure-directing agents (OSDAs), UZM-35 and MCM-68, were prepared. The location of Brønsted acid sites derived from the framework Al atoms and acidic properties were investigated based on 27Al MQMAS NMR and in situ IR techniques combined with the evaluation of the catalytic activity. We have successfully found a significant difference in the location of Brønsted acid sites in the MSE-type framework; 61 and 33% of acid sites were located at the 12-ring channel for MCM-68 and UZM-35, respectively. The differences in the location of the acid sites yielded their unique catalytic activities for the hydrocarbon cracking reactions, indicating that a well-chosen type of OSDAs for the synthesis is one of the possibilities for controlling the distribution of the framework Al atoms in the MSE-type framework.
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