Catalyst for preparing propylene by methyl alcohol and/or dimethyl ether and preparation method thereof

Abstract

The invention discloses a catalyst for preparing propylene by methyl alcohol and / or dimethyl ether and a preparation method thereof. The catalyst takes HZSM-5 molecular sieve with the crystallite dimension being less than 100 nanometers as raw material, and adopts fluorine-containing compound solution for dipping; after that, the catalyst is prepared by high temperature calcination and has the fluorous mass percentage of 2-20%. The catalyst prepared by the method has very high propylene yield and stability for the reaction for preparing the propylene by transforming the methyl alcohol.

Description

technical field [0001] The invention relates to a molecular sieve catalyst for preparing propylene from methanol and / or dimethyl ether and a preparation method thereof. Background technique [0002] Propylene is an important basic organic raw material, mainly used in the production of chemical products such as polypropylene, acrylonitrile and propylene oxide. At present, propylene production mainly comes from steam cracking ethylene units and catalytic cracking units in refineries. Since petroleum is a non-renewable resource with limited reserves and the price of petroleum continues to rise, all countries in the world have begun to devote themselves to the development of non-petroleum route to propylene technology. Among them, the technology of producing propylene from coal, natural gas and biomass through methanol or dimethyl ether has received more and more attention. The key to this technology is the development of high-performance catalysts. At present, the best cataly...

AI Technical Summary

Problems solved by technology

However, the existing catalysts for the reaction of producing propylene from methanol or dimethyl ether all adopt micron-scale (>100 nanometer) HZSM-5 molecular sieves with larger grain size, and the yield of propylene is low and / or the catalyst stability is relatively poor