ゼオライトZSMの合成とその触媒活性

概要

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The characterization of zeolites ZSM synthesized by using various tetraalkyl ammonium bromide (Me_4NB, Et_4NB, Pr_4NB and Bu_4NB) was investigated. The synthesis method was based upon the ZSM-11 method. The zeolites were produced in the ZSM-5 type by using Na^+-Et_4N^+, Pr_4N^+ and Bu_4N^+ cation systems, and a new compound was obtained in case of Na^+-Me_4N^+ cation system. It was found that the structures of synthesized ZSM-5 type were of orthorhombic symmetry when Na^+-Et_4N^+ and Pr_4N^+ cations were used and of monoclinic symmetry when Na^+-Bu_4N^+ cations were used. The catalytic activity tests of synthesized zeolites of H-type were carried out by the fixed bed method. From the fact that the zeolite of ZSM-H type has its constraint index between 3.9-5.4,it was presumed that tis crystal structure contain ten-membered rings and has pore sizes of 6∿7A. A main product of disproportionation of toluene over zeolite ZSM-Pr-H type catalyst was a benzene, and in case of isomerization of m-xylene, a toluene was produced. In both reactions, demethylation occurred. The effects of shape-selective properties of zeolites ZSM-H-type revealed themselves remarkable.
東海大学の論文