Preparation method for ZSM-48 molecular sieve

Abstract

The invention relates to a preparation method for a ZSM-48 molecular sieve. The method comprises the steps of mixing silicon source, aluminium source, alkali, water and template uniformly; crystallizing, filtering, washing, drying and roasting to obtain the ZSM-48 molecular sieve, wherein the template is dibromohexane (DBH), trimethylamine (TMA) and ethanol (ETA); and properly adjusting the amount of the reaction mixture, and thus the ZSM-48 molecular sieve is obtained. Compared with a molecular sieve prepared by a conventional technology, the ZSM-48 molecular sieve synthesized by the method has the characteristics of low synthetic cost.

Description

technical field [0001] The invention relates to a synthesis technology of molecular sieves, in particular to a preparation technology of ZSM-48 molecular sieves. Background technique [0002] In 1983, the patent USP4397827 reported the synthesis of ZSM-48 molecular sieve for the first time. ZSM-48 molecular sieve is a molecular sieve with a ten-ring channel structure, with a pore size of 0.53nm×0.56nm. Pure silicon ZSM-48 molecular sieve has good low-carbon olefin selectivity in the reaction of synthesis gas to olefins, and low silicon-aluminum ratio ZSM-48 molecular sieve has good catalytic performance, which has attracted widespread attention. [0003] At present, the research focus of ZSM-48 molecular sieve is still on its synthesis process. People have been improving the synthesis method through various methods in order to obtain ZSM-48 molecular sieve with low silicon-aluminum ratio and reduce the synthesis cost of the molecular sieve. The synthesis process of the mol...

AI Technical Summary

Problems solved by technology

At present, although the synthesis technology of ZSM-48 molecular sieve is relatively mature, its existing problems are also relatively obvious. In order to obtain ZSM-48 molecular sieve with low silicon-aluminum ratio, expensive templates must be used.

Images