A high-silica EMT molecular sieve with EMT topology, its synthesis method and application

Abstract

This invention discloses a high-silica EMT molecular sieve with an EMT topology, its synthesis method, and its applications. The anhydrous chemical composition of the molecular sieve is shown in Formula I: kM·mR·(Si x Al y O2; where M is selected from at least one alkali metal element; R represents an organic template agent; k represents the number of moles of Si x Al y O2 corresponds to the number of moles of the alkali metal element M, k = 0~0.20; m represents the number of moles of (Si) x Al y The molar number of O2 corresponding to template agent R, m = 0.01~0.20; x and y represent the molar fractions of Si and Al, respectively, 2x / y = 7~40, and x+y = 1. The EMT molecular sieve of this invention has a silicon-aluminum oxide ratio of 7~30, high crystallinity and purity, and good hydrothermal / thermal stability. It can be used in catalytic reactions such as isobutane / 2-butene alkylation to produce high-octane gasoline, which is of great significance in actual chemical production.

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