Catalyst based on volatile organic pollutant purification and preparation method

Abstract

The invention relates to a catalyst based on volatile organic pollutant purification and a preparation method. The catalyst comprises a carrier, wherein the carrier is a cordierite honeycomb carrier;the carrier is coated with oxidizing coating for industrial volatile organic pollutant purification; the coating amount of a coating slurry layer thereof is 50-200 g / L. The preparation method is simple, and the steps are easy to operate; aluminum oxide in the coating is used as a noble metal Pd loading matrix, a molecular sieve is a low-temperature organic pollutant storage material and serves asa noble metal Pt loading matrix, and the low-temperature organic pollutant adsorption and the carrier hydrophobicity are improved at the same time; Zr (NO3)4-5H2O serves as a stabilizing aid. A VOCs catalyst prepared by the preparation method provided by the invention has lower complete conversion temperature of organic pollutants, namely lower HCT100; loading application of noble metal Pt to themolecular sieves is beneficial to the effective capture and catalytic oxidation of the organic pollutants, so that the discharge of the organic pollutants is reduced; meanwhile, the VOCs catalyst alsohas a relatively good CO treatment effect.

Description

technical field [0001] The invention relates to a catalyst and a preparation method based on the purification of volatile organic pollutants, 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 pollutants. [0004] The reduct...

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Problems solved by technology

[0006] At present, the organic pollutant catalytic oxidation catalyst coating has a high light-off temperature of organic pollutant species, which is not conducive to the removal of organic pollutant species in the field of industrial catalysis, and for diesel vehicles and natural gas fields, there is a problem of high light-off temperature of CO, Because at low temperature, the adsorption capacity of CO and noble metals is strong, and the active sites are occupied by CO. Only when the CO desorption reaction is completed, the reaction of organic species will start. Higher COT50 will inhibit the reaction of organic pollutant species. In addition, the pro- The strong binding energy between the aqueous carrier and the catalyst at low temperature will also inhibit the activity of the catalyst, which is not conducive to the catalytic oxidation of organic pollutants

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