Integral type metal carrier three-way catalyst and preparation method thereof

Abstract

The invention provided an integral type metal carrier three-way catalyst and a preparation method thereof. The preparation method is characterized by comprising the steps of: directly adding catalysis active component into sizing agent which contains coating materials such as active aluminum oxide, and the like, to form catalysis active component-containing compound sizing agent; directly coating the compound sizing agent on the surface of the integral type metal carrier; drying and roasting to obtain the integral type metal carrier three-way catalyst. The one-off loading quantity of the prepared metal carrier integral type three-way catalyst can be controlled in the range of 3%-20% (weight ratio) according to the adjustment of the solid content, the granularity and the viscosity of the sizing agent. The prepared catalyst has the coating with even depth, is stably loaded and hardly falling, and has simple and convenient preparation method, low cost and good catalysis performance.

Description

technical field [0001] The invention relates to an integral metal-carrier three-way catalyst and a preparation method thereof, specifically: directly adding catalytically active components into a slurry containing coating materials such as activated alumina to form a composite slurry containing catalytically active components material, and then directly coated on the surface of the monolithic metal carrier, after drying and roasting, the monolithic metal carrier three-way catalyst is obtained. The coating amount of the prepared metal-based monolithic three-way catalyst can be controlled within the range of 3% to 20% (weight ratio) according to the adjustment of the solid content, particle size and viscosity of the slurry. The obtained catalyst coating has uniform thickness, firm loading and is not easy to fall off, and the preparation method is simple, the cost is reduced, and the catalytic performance is good. Background technique [0002] Monolithic catalysts are integrat...

AI Technical Summary

Problems solved by technology

However, in the actual operation process of this method, the ball milling of the activated alumina coating slurry will consume a large amount of power and time. More importantly, the slurry after the ball milling is prone to jelly phenomenon, and the fluidity of the slurry is relatively low. Poor, this is not conducive to coating on the carrier, the carrier pores will be blocked, cracks or even fall off are prone to occur in the process of drying and roasting, and ultimately lead to a lower loading of alumina

In addition, the re-loading of catalytically active components will also generate a lot of production costs and prolong the production cycle