Abstract

The work is aimed at a fundamental study of the formation of acid sites in MFI zeolites obtained in a fluoride medium using Aerosil, silica gel, and silica sol as sources of silicon. The synthesized samples have been characterized by a set of instrumental methods and tested in the reaction of methanol conversion to hydrocarbons. It has been shown that the synthesis of MFI zeolite in a fluoride medium leads to the insertion of aluminum into the tetrahedral positions of the zeolite framework to form isolated acid sites. Moreover, the type of amorphous source of silicon affects both the amount of incorporated aluminum and the size of the product crystals. It has been established that the use of silica sol as a silicon source leads to an increase in the catalyst time-on-stream stability and a decrease in the selectivity for ethylene. The obtained result is explained by an increase in the proportion of Al atoms localized in zeolite channels.

中文翻译：

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在氟化介质中获得的MFI沸石上的甲醇转化：硅源的影响

摘要

这项工作的目的是基础研究在氟化物介质中使用Aerosil，硅胶和硅溶胶作为硅源在MFI沸石中形成酸位。合成的样品已通过一系列仪器方法进行了表征，并在甲醇转化为烃的反应中进行了测试。已经表明，在氟化物介质中合成MFI沸石导致铝插入沸石骨架的四面体位置以形成分离的酸位。而且，硅的非晶源的类型既影响铝的掺入量又影响产品晶体的尺寸。已经确定，使用硅溶胶作为硅源导致催化剂的运行时间稳定性的增加和对乙烯的选择性的降低。