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] There are two steps in the production process of molecular sieve catalyst used in methanol-to-olefins, namely the preparation of semi-finished molecular sieve and the preparation of finished catalyst. The preparation of semi-finished molecular sieve is to synthesize a molecular sieve precursor liquid with a certain ratio of raw materials such as aluminum source, silicon source and phosphorus source under specific template conditions. After washing and filtering, it is dried in an oven and subjected to high-temperature activation roasting. After roasting, the product is mixed with water Put it in a batching tank for grinding and beating until the molecular sieve in the obtained slurry is evenly dispersed and the particle size meets the index requirement. Add a certain amount of the batching to ...

AI Technical Summary

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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