Catalyst degradation method

Abstract

The invention discloses a catalyst degradation method which comprises the following steps: impregnating the catalyst to be degraded in phosphoric acid or phosphate solution; then calcining the impregnated catalyst; and finally performing thermal aging treatment. Difference in performance between the catalyst after the degradation treatment by the method and the practically used catalyst is relatively small, and the precision is high.

Description

technical field

[0001] The invention relates to a method for deteriorating a catalyst, in particular to a method for deteriorating an automobile tail gas purification catalyst. Background technique

[0002] The deterioration of the automobile exhaust purification catalyst mainly refers to the deterioration of the catalyst performance, which mainly includes the long-term exposure of the catalyst to the high temperature environment, the sharp decrease of the specific surface area of ​​the carrier in the catalyst, the melting and collapse of the carrier, and the sintering of the active components of precious metals and additives such as cerium oxide. , gathering. In addition, noble metals will be oxidized under high temperature conditions, the interaction between noble metals, the reaction between noble metal oxides and supports, the reorientation of the noble metal surface, and metal sublimation, etc., all of these effects lead to a rapid decline in the catalytic performance o...

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