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Method for regenerating three-way catalyst Pd/Na2O/K2O/C

A three-way catalyst and catalyst technology, which is applied in the direction of catalyst regeneration/reactivation, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. It can solve the problem of unsatisfactory performance of recycled products with recovery rate, etc. problem, to achieve the effect of improved performance, good repeatability and stable service life

Inactive Publication Date: 2015-05-20
于建文
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Problems solved by technology

[0003] At present, the regeneration and recovery methods of three-phase catalysts mainly include wet method and fire method, but the recovery rate of these two methods and the performance of the regenerated product are not satisfactory.

Method used

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  • Method for regenerating three-way catalyst Pd/Na2O/K2O/C

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Embodiment 1

[0015] The deactivated Pd / Na 2 O / K 2 The O / C three-way catalyst is treated as follows:

[0016] (1) The poisoned Pd / Na 2 O / K 2 After the O / C three-way catalyst is washed with water, soak it in a dilute sulfuric acid solution with a mass concentration of 20%, regenerate it under microwave heating for 3 hours, the regeneration temperature is 40°C, and the regeneration solid-liquid ratio is 20g / L, and then dry it at room temperature for 15 hours;

[0017] (2) The catalyst obtained in step (1) is activated and regenerated with plasma of nitrogen and oxygen, and the regeneration conditions are as follows: a pulse power supply is used, the peak voltage is 8kV, the frequency is 150hz, the regeneration time is 2h, and the temperature is 100°C;

[0018] (3) the catalyzer that step (2) obtains is that concentration is 15% H 2 o 2 Soak in the solution for 3 hours, and then dry at 80° C. to obtain a dried three-way catalyst.

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Abstract

The invention relates to a method for integrally regenerating a catalyst. The method disclosed by the invention is mainly used for regenerating similar three-way catalysts, namely Pd / Na2O / K2O / C and the like, outstandingly optimizing the regeneration treatment process by combining a microwave regeneration method with a low-temperature plasma regeneration method and regenerating the treated catalyst through a H2O2 solution, so that the catalyst is further enhanced in property, more stable in service life, good in repeatability and suitable for wide popularization and application in industry.

Description

technical field [0001] The invention belongs to the field of catalyst regeneration, in particular to a comprehensive regeneration method for three-way catalysts, especially Pd / Na 2 O / K 2 Regeneration method of O / C three-way catalyst. Background technique [0002] With the increasing number of urban automobiles, the pollution caused by the exhaust gas emitted by automobiles is becoming more and more serious. Therefore, it has become an urgent task to limit and control vehicle exhaust pollution as a mobile pollution source, especially in the non-heating period, the share rate of vehicle exhaust pollutants is over 70%. The main pollutants in automobile exhaust are hydrocarbons (HC), carbon monoxide (CO), nitrogen oxides (NOx) and carbon dioxide (CO 2 )Wait. The treatment of automobile emissions can be divided into two categories: in-machine treatment and out-of-machine treatment. In-engine treatment (active treatment) is mainly to improve the emission performance of the en...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/96B01J38/00
CPCB01J23/58B01J23/96B01J38/12B01J38/48B01J38/60
Inventor 孙高雷
Owner 于建文
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