Catalyst with high selectivity for low-carbon olefin and preparation method of catalyst

Abstract

The invention discloses a catalyst with high selectivity for low-carbon olefin and a preparation method of the catalyst. The preparation method comprises the following steps that (1) a B-ZSM-5 molecular sieve matrix-1 is prepared by crystallization and calcination with a silicon source, deionized water, a template agent, an alkali source, a boron source and a seed crystal solution as raw materials; (2) NaOH and Al(NO3)3 are mixed with water to prepare a treatment solution, the B-ZSM-5 molecular sieve matrix-1 is added, and a B-ZSM-5 molecular sieve matrix-2 is prepared by stirring and roasting; (3) a B-ZSM-5 molecular sieve matrix-3 is prepared by ammonium exchange; and (4) a final ZSM-5 molecular sieve is prepared by pressing and sieving. The catalyst with the high selectivity for the low-carbon olefin and the preparation method of the catalyst have the advantages that (1) the prepared ZSM-5 molecular sieve can be used in an MTO process or an MTP process; (2) the prepared ZSM-5 molecular sieve has high total selectivity for C2-C4 olefin no matter in the MTO process or in the MTP process; and (3) the catalytic stability of the prepared ZSM-5 molecular sieve is improved.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a catalyst with high selectivity to low-carbon olefins and a preparation method thereof, belonging to the technical field of catalysts. Background technique [0002] Low-carbon olefins such as ethylene and propylene are important basic chemical raw materials. With the development of my country's national economy, especially the development of modern chemical industry, my country's demand for low-carbon olefins is increasing day by day, and the contradiction between supply and demand will become increasingly prominent. [0003] The MTO process of methanol to ethylene, propylene and other low-carbon olefins and the MTP process of methanol to propylene are important chemical technologies at present. This type of technology uses methanol synthesized from coal or natural gas as raw material to produce low-carbon olefins, which is the core technology for the development of...

AI Technical Summary

Problems solved by technology

[0005] 1. Poor catalytic stability;

[0006] 2. The total selectivity of light olefins is low

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