A kind of shaped molecular sieve catalyst and its preparation method and application

Abstract

The invention provides a molded molecular sieve catalyst and a preparation method and an application thereof; the method includes the following steps: (1) filtering, washing and separating a molecular sieve solution after crystallization in molecular sieve synthesis, to obtain a molecular sieve slurry; preferably, washing and separating the molecular sieve with membrane separation; (2) mixing the molecular sieve slurry obtained in the step (1) with a binder, adding an extrusion aid and an adhesive solvent, and processing and molding to obtained a molded catalyst; and (3) drying, carrying out ion exchange and roasting the molded catalyst obtained in the step (2), to obtain the molded molecular sieve catalyst, wherein preferably, the drying temperature is 50-120 DEG C, more preferably 100 DEG C; and preferably, the roasting is carried out for 5-7 h at the temperature of 550-650 DEG C, more preferably the roasting is carried out for 6 h at the temperature of 600 DEG C. The catalyst prepared by the method has the characteristic of high dispersion of an active phase, the performance of the catalyst is greatly improved, and the activity in methanol conversion preparation of propylene is more excellent.

Description

technical field [0001] The invention relates to the field of molecular sieve preparation, in particular to a shaped molecular sieve catalyst and its preparation method and application. Background technique [0002] Propylene is an important basic chemical raw material, its traditional production depends on petroleum processing, and the shortage of petroleum resources promotes the development of non-petroleum route propylene production process. In recent years, the conversion of coal-based methanol and / or dimethyl ether to propylene (MTP) with a solid acid catalyst has attracted increasing attention. As a new process for propylene production, the MTP process has the advantages of wide sources of raw materials, high propylene yield, and easy co-production of polypropylene or other propylene derivatives. It is especially suitable for my country's energy structure with more coal, less gas, and less oil. It has important The application value is an important supplement to my coun...

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Problems solved by technology

This method saves investment and reduces environmental pollution by reusing the crystallization slurry. However, since the patent uses spray drying to prepare a fluidized catalyst, the mechanical properties of the obtained catalyst are suitable for fluidized bed processes but not for fixed beds. Process catalyst

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