Catalyst with low-temperature activity for purification of volatile organic pollutants and preparation method

Abstract

The invention relates to a catalyst with low-temperature activity for purification of volatile organic pollutants and a preparation method. The catalyst comprises a carrier, wherein the carrier is a cordierite cellular carrier, and the carrier is coated with an oxide coating for purification of industrial volatile organic pollutants. In the coating, alumina is adopted as a loading matrix for noblemetals Pt and Pd, and a Mn-Ce-Zr composite oxide is synthesized and added to promote efficient conversion of the organic pollutants by a VOCs (volatile organic chemicals) catalyst. According to the prepared VOCs catalyst, a relatively high conversion rate can be achieved by adopting a relatively small amount of noble metals, namely the preparation of VOCs catalyst by adopting the preparation method of the invention has the advantage of lower organic pollutant complete conversion temperature, namely relatively low HCT100; the Mn-Ce-Zr composite oxide prepared by a sol-gel method is applied toimprovement of the durability of the VOCs catalyst and the VOCs catalyst achieves a relatively good treatment effect on CO.

Description

technical field [0001] The invention relates to a catalyst capable of purifying low-temperature active volatile organic pollutants and a preparation method thereof, belonging to the technical field of catalyst preparation. Background technique [0002] Volatile organic compounds are a general term for a class of organic compounds. Like particulate matter, they are a large class of air pollutants. They mainly come from industrial exhaust gases, such as papermaking, paint coatings, mining, etc., and exhaust gases emitted by vehicles. Exhaust gas emitted by energy vehicles such as diesel vehicles and natural gas. [0003] Volatile organic pollutants have caused great harm to the environment, the growth of animals and plants, and human health, thereby increasing the deterioration of the atmospheric environment, so they have been valued by countries all over the world. Many developed countries have promulgated corresponding regulations to limit the discharge of organic pollutant...

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Problems solved by technology

[0006] At present, the VOC catalyst coating has a high ignition temperature of organic pollutants, which is not conducive to the removal of organic pollutants in the field of industrial catalysis, because at low temperatures, the adsorption capacity of CO and noble metals is strong, and the active sites are occupied by CO. Only when CO After the desorption reaction is completed, the reaction of organic species will start, and a higher COT50 will inhibit the reaction of organic pollutant species. In addition, the amount of noble metal used in the noble metal-supported catalyst is too large, and the production cost of the catalyst is too high

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