A method and system for microwave-assisted regeneration of a three-way catalyst

Abstract

The invention relates to a microwave-assisted regeneration method and system for a three-way catalyst, which regenerates catalyst activity. The microwave technology is applied to the catalyst regeneration process, and the active regeneration is realized through pretreatment, classification regeneration, active component supplementation and microwave activation treatment. Detect the active site of the catalyst, which has the value of regeneration. According to the deactivation reason, it can be divided into three types: heat deactivation, poisoning deactivation, and carbon deposition deactivation. Microwave-assisted elimination of deactivation factors, followed by microwave field environment Selective loading of coatings, additives, Active components, microwave radiation activates catalyst active sites. The invention utilizes microwave-assisted regeneration, supplements absorbents to strengthen the microwave absorption characteristics of inactivation target sites, microwave field-assisted targeted elimination of inactivation factors, fixed-point promotion of activation of active site precursors, regeneration process without crushing, and greatly improves catalyst regeneration efficiency. Reducing the loss rate of active components and reducing mechanical structure damage is conducive to multiple regenerations of the catalyst, prolonging the service life of the catalyst and reducing the overall energy consumption of regeneration.

Description

technical field [0001] The invention belongs to the technical field of catalyst regeneration, and in particular relates to a microwave-assisted regeneration method and system for a three-way catalyst. Background technique [0002] The information disclosed in this background section is only intended to increase the understanding of the general background of the present invention, and is not necessarily taken as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. [0003] The catalyst maintains high catalytic activity while reducing the catalytic conversion temperature of polluting gases, and is widely used in the purification of polluted gases in automobile exhaust conversion systems. A three-way catalyst consists of a carrier, a coating, an additive and an active component. Platinum, palladium, rhodium and other precious metals are usually used as active components, among which platinum and pa...

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Problems solved by technology

[0007] (1) Heat is gradually transferred from the outside of the catalyst to the inside, resulting in a temperature gradient of high outside and low inside, and the resulting thermal stress damages the overall structural strength of the catalyst, which is not conducive to multiple regenerations;

[0008] (2) The penetration is poor, and the heat is difficult to penetrate into the interior of the catalyst;

[0009] (3) The temperature rise rate is slow during heating, the energy consumption of the invalid effect is high, and the product quality is low;

[0010] (4) The controllability of the temperature field is poor, which is not conducive to configuring the control system for automatic management;

[0011] (5) The dispersion uniformity of active components is low, and the uniformity of regeneration effect is poor;

[0012] (6) The loss rate of active components is high, and the amount of supplementary impregnation of regenerated active components is large;

[0013] (7) The regeneration method is single, there is no classification of regeneration according to the cause of inactivation, and the regeneration effect is poor

[0014] Microwave radiation is introduced into the catalyst regeneration process to realize rapid heating of the catalyst with a low temperature gradient from the inside to the outside, avoiding the fragmentation or cracking of the catalyst module due to uneven heating. The existing catalyst regeneration process using microwave radiation is simply to use microwave selectively and quickly The heating characteristics replace the conventional heating process, and the unique advantages of the microwave action characteristics are not used to assist the regeneration of the three-way catalyst according to the cause of catalyst deactivation, so as to reduce the damage of the mechanical structure and facilitate the regeneration of the catalyst multiple times; moreover, because the catalyst activity evaluation has not been carried out, the appropriate amount of catalyst is added in a targeted manner Active components and specific microwave-absorbing media, catalyst materials have weak microwave-absorbing performance, high loss rate of active components, low activation rate of catalyst active sites, and the improvement of microwave field-assisted catalyst regeneration efficiency is not obvious

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