Preparing method of catalyst containing modified SAPO-34 molecular sieve and application thereof

Abstract

A preparing method of a catalyst containing a modified SAPO-34 molecular sieve is disclosed. The method includes S01) fully mixing an aluminum source and water, then adding deionized water, a phosphorus source, a first template, a silicone source, a chromium salt and a second template in order, and stirring the mixture at 20-30 DEG C for 1-2 h to fully mix the materials to obtain a mixed reactionliquid, with the mole ratio of the aluminum source, the phosphorus source, the silicon source, the chromium salt, the first template, the second template and the water being (0.7-1.5):(0.7-1.5):(0.1-0.4):(0.1-0.4):(0.5-2.5):(0.5-2.5):(50-70). The invention also discloses application of the method in MTO reactions. The method can reduce carbon deposition of the catalyst, can improve diffusion ability of the catalyst and can improve diene selectivity.

Description

technical field

[0001] The invention relates to a preparation method and application of a catalyst containing modified SAPO-34 molecular sieve, belonging to the technical field of catalysts. Background technique

[0002] Among the many olefin compounds, ethylene and propylene are the simplest two small molecular olefins, and their applications are spread across various fields of the national economy and people's livelihood. Therefore, the production technology and productivity of ethylene and propylene are a measure of a country's petrochemical technology development level and industrial development level important sign. In recent years, the industrial application of methanol to olefins technology (MTO) has injected new vitality into the production technology of ethylene and propylene. Since this technology can get rid of the dependence of olefin production on petroleum resources, it is especially suitable for my country's national conditions of rich coal, poor oil and littl...

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