Molecular sieve catalyst and preparation method thereof

Abstract

The invention discloses a molecular sieve catalyst and a preparation method thereof. The preparation method comprises the following steps: S1, preparing a molecular sieve precursor solution by using an aluminum source, a silicon source, a phosphor source and template agent as materials through a hydrothermal method; S2, directly mixing molecular sieve filter cakes obtained by filtering and washing the molecular sieve precursor solution with water, grinding the mixed solution to obtain molecular sieve sizing agent, adding ingredients to the molecular sieve sizing agent for continuously grinding for 2-4 hours to obtain a molecular sieve catalyst semi-finished product; and S3, drying, pelleting and roasting the molecular sieve catalyst semi-finished product to obtain the molecular sieve catalyst. According to the preparation method disclosed by the invention, the steps of drying and high-temperature roasting and activating after the washing and filtering of the molecular sieve sizing agent are reduced; the problems that the product yield is reduced and the environment is affected when the landing powder is much at the charging and discharging steps of the high-temperature roasting process are avoided; and the problem that the sizing agent is difficult to grind as the molecular sieve catalyst semi-finished product is easy to agglomerate after the roasting is also solved. Moreover, the quality and the performance of the finished product molecular sieve catalyst are ensured while the production process is optimized.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a molecular sieve catalyst and a preparation method thereof. Background technique [0002] The molecular sieve catalyst production process used in methanol to olefins has two steps, namely the preparation of semi-finished molecular sieve products and the preparation of finished catalysts. The preparation of molecular sieve semi-finished products is to synthesize the molecular sieve precursor solution under the condition of a specific template agent according to a certain ratio of raw materials such as aluminum source, silicon source and phosphorus source. After washing and filtering, it is dried in an oven and roasted at high temperature. After roasting, the product is mixed with water. Put it into the batching tank for grinding and beating until the molecular sieve in the obtained slurry is uniformly dispersed and the particle size reaches the target requirement, add a certain...

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Problems solved by technology

Its general process is as follows figure 1 As shown, it can be seen that the existing molecular sieve catalyst production process is relatively complicated

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