A kind of hollow h-zsm-5 molecular sieve and preparation method and application

Abstract

The invention provides a hollow H-ZSM-5 molecular sieve of which the particle diameter is 70 to 2600 nm, the shell thickness is 20 to 300 nm, and the silica-alumina ratio is 20 to 200; the average pore diameter of holes distributed in shells of the molecular sieve is 10 to 200 nm. The molecular sieve has the advantages that the limitation problem on ZSM-5 diffusion can be solved effectively; the raw material cost is low; the preparation process is simple and easy to control; the product yield is high.

Description

technical field [0001] The invention relates to a method for preparing a catalyst, in particular to a method for preparing a hollow H-ZSM-5 molecular sieve catalyst used in the methanol-to-gasoline reaction. Background technique [0002] Methanol-to-gasoline (MTG) technology is a process of directly synthesizing high-quality clean fuel gasoline with no sulfur, no nitrogen, low benzene and low olefins, using methanol as a raw material under the action of a catalyst, starting from synthesis gas. The technology has clean raw materials, short process flow, high product selectivity and no refining process. Small-scale industrial production can be profitable, and it is a strong supplement to non-petroleum routes other than Fischer-Tropsch synthetic oil. The industrial application of this technology, on the one hand, can replace part of imported crude oil, supplement the source of domestic finished gasoline, reduce the dependence on foreign oil, and improve the country's energy se...

AI Technical Summary

Problems solved by technology

However, the chemical treatment method is difficult to control the pore-forming process, and a large amount of molecular sieve structure substances are disposed of, resulting in a low yield of the final product (Wang Y, Lin M, Tuel A, Microporous and Mesoporous Materials 2007, 102(1–3), 80-85.)

Using mesoporous templates such as nano-carbon materials can also induce ZSM-5 to form a mesoporous structure, but the template materials are expensive and difficult to achieve industrialization (Wang L, Zhang Z, Yin C, ShanZ, Xiao F-S, Microporous and Mesoporous Materials 2010, 131(1–3),58-67.)

Images