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Catalyst degradation method

A catalyst and oxidation technology, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low precision, achieve high precision and reduce the effect of performance difference

Active Publication Date: 2011-06-29
ZHEJIANG GREAT CHEM SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In order to overcome the problem of low precision of the catalyst degradation method in the prior art, the present invention provides a catalyst degradation method, the performance difference between the degraded catalyst and the actually used catalyst is small, and the precision is high

Method used

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  • Catalyst degradation method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0042] This example is used to illustrate the method disclosed in the present invention.

[0043] Place catalyst A in concentration of 0.4mol / L (NH 4 ) 2 HPO 4 solution for 12h, and then calcined in air at 500°C for 3h.

[0044] Then the catalyst obtained by the above-mentioned treatment is placed in a high-temperature calciner, and in a vacuum environment (pressure is 10 3 Pa) at 1000°C for 15h. A degraded catalyst sample S1 was prepared.

Embodiment 2

[0046] This example is used to illustrate the method disclosed in the present invention.

[0047] Place catalyst A in concentration of 0.05mol / L (NH 4 ) 2 HPO 4 In the solution for 2 hours, the catalyst was taken out, placed in an oven, and dried at a temperature of 110° C. for 3 hours. Then calcined at 450°C for 8h.

[0048] The catalyst obtained by the above treatment is placed in a quartz tube reactor, and the aging atmosphere is an oxidation-reduction oscillation atmosphere, wherein the oxidation atmosphere is 10% water vapor, 10% CO 2 , 5% O 2 , and the remaining components are N 2 , the reducing atmosphere is 10% water vapor, 10% CO 2 , 10% CO, the rest is N 2 , air velocity is 30,000h -1 , the oscillation frequency was 10 Hz, the aging temperature was 1000° C., and the aging time was 18 h, and the degraded catalyst sample S2 was prepared.

Embodiment 3

[0050] This example is used to illustrate the method disclosed in the present invention.

[0051] Place the catalyst A in the concentration of 0.003mol / L H 3 PO 4 0.1h in the solution, and then the catalyst was taken out, placed in an oven, and dried at a temperature of 110°C for 3h. Then calcined at 550°C for 6h.

[0052] The catalyst obtained from the above treatment was placed in a quartz tube reactor and heated to 1050 °C to contain 30 ppm SO 2 The air is used as the carrier gas, the space velocity is 50,000h -1 , treated for 12h to obtain the degraded catalyst sample S3.

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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...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J37/08B01D53/94
Inventor 刘武略方伟张清涟
Owner ZHEJIANG GREAT CHEM SCI & TECH
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