Fast synthesis process of strong acid-type ZSM-5 molecular sieve

Abstract

The fast synthesis process of strong acid-type ZSM-5 molecular sieve includes compounding solution A with silicon source, template agent and one half of deionized water in certain proportion; compounding solution B with aluminum source, inorganic acid and the other half of deionized water in certain proportion; adding dropwise solution B to solution A to prepare guiding agent; compounding solution C with silicon source, template agent and one half of deionized water in certain proportio; compounding solutio D with aluminium source, inorganic acid and the other half of deionized water in certain proportion; adding dropwise solution D to solution C and adding guiding agent in the amount of 5-10 vol% of total amount. The process has advantages of short synthesis period and storing acidity.

Description

[0001] Field:

[0002] The invention belongs to a method for synthesizing molecular sieves, in particular to a method for rapidly synthesizing strong acid type ZSM-5. Background technique:

[0003] Zeolite science and technology is one of the hottest fields at present. ZSM-5 zeolite series is a kind of high silica zeolite widely studied. Its unique acidic system and shape selectivity have been the subject of many researchers. Its skeleton nSIO 2 / nAI 2 o 3 The specific range is 12--∞, the pore diameter is 5.4×5.6 , it is a Pentasil structure composed of eight five-membered rings, and the specific surface area generally reaches 400-600m 2 , with high selectivity and thermal stability. It is widely used in the conversion of various hydrocarbons, but because the molecular sieves synthesized by different methods have differences in acidity, grain size, specific surface area and even the distribution of Al components that affect their properties, the zeolite catalysts prepared ...