Regeneration method of molecular sieve catalysts

Abstract

The invention relates to a regeneration method for molecular sieve catalysts, and mainly solves the problems that the regenerated molecular sieve catalyst fails to long-term repeated use and the prior regeneration method has complicated process. The regeneration method comprises the following steps: firstly removing carbon deposits or other surface-attached substances by burning dealuminated deactivated molecular sieve catalyst in oxygen-enriched atmosphere; then compounding an aluminum salt solution (aluminum concentration in the range from 0.4 mol / L to 4 mol / L) containing aluminum in an amount 1 to 5 times of the required Si-Al ratio, calculated on the basis of the molecular sieve contained in the catalyst in the form of pure silicon molecular sieve; and finally allowing the impregnation contact between the aluminum salt solution and the catalyst, drying, and calcining in inert atmosphere to obtain the regenerated catalyst. With the realumination technical scheme, the regeneration method overcomes the problems in the prior art and is applied to the industrial production of alkenes via catalytic cracking of petroleum naphtha.

Description

technical field [0001] The invention relates to a regeneration method of a molecular sieve catalyst. Background technique [0002] Molecular sieve catalysts are widely used in petrochemical and other fields due to their strong acidity, good shape-selective catalytic performance and good thermal stability. However, since the molecular sieve catalyst is prone to skeleton dealumination in the environment of high temperature or high temperature water vapor, the loss of active sites of the catalyst will cause deactivation, and it is necessary to regenerate the catalyst with aluminum supplementation to restore the activity of the catalyst. [0003] The literature (Petroleum Refining and Chemical Industry, 2004, 35(5), 15-18) reported that the aluminum-enriched zeolite beta catalyst was prepared by adding aluminum salt in one molding method, and combined with the reaction activity evaluation experiment, it was proved that adding aluminum can make the acid content of the catalyst ...

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is that in the prior art, the regenerated molecular sieve catalyst cannot be reused, and the regeneration process is complicated. A new molecular sieve catalyst is provided Catalyst regeneration method