Monolithic catalyst for high-water-content acrylic acid waste gas purification and preparation method of monolithic catalyst

Abstract

The invention discloses a monolithic catalyst for high-water-content acrylic acid waste gas purification and a preparation method of the monolithic catalyst. The preparation method comprises the steps of: loading rare earth oxide modified active aluminum oxide, cerium oxide and trace precious metal on the surface of a cordierite honeycomb ceramic carrier by adopting a once vacuum coating method to prepare a monolithic palladium catalyst; and then treating acrylic acid waste gas and methylacrylic acid tail gas with high water content through a catalytic combustion method by using the catalyst, and removing low-concentration organic pollutants in the waste gas so that emitted gas reaches the relevant atmospheric pollutant emission standard in China. The monolithic catalyst has the advantages of simple preparation process of the once vacuum coating method, short production period, low energy consumption and high load rate of the active coating, strong bonding force with the cordierite honeycomb ceramic carrier, and improved activity and stability because precious active components are uniformly dispersed in the aluminum oxide active coating.

Description

technical field [0001] The present invention relates to a monolithic palladium catalyst for the catalytic combustion of acrylic acid waste gas with high water content and its preparation method, specifically, activated alumina, cerium oxide and trace precious metals modified by rare earth oxides by a vacuum coating method Palladium is loaded on the surface of the cordierite honeycomb ceramic carrier to prepare a monolithic palladium catalyst, and then use the catalyst to treat acrylic acid waste gas and methacrylic acid tail gas with high water content by catalytic combustion, and remove low-concentration organic pollution in the waste gas so that the exhaust gas meets the relevant air pollutant emission standards of our country. Background technique [0002] Acrylic acid is an important organic chemical raw material and occupies a very important position in the field of fine chemicals. It is mainly used to produce acrylic esters (resins) in industry, accounting for about 60...

AI Technical Summary

Problems solved by technology

[0008] The above-mentioned existing patented technologies all use a two-step method to prepare catalytic combustion catalysts, that is, first coat the aluminum oxide coating on the honeycomb ceramic carrier, after drying and roasting, then impregnate the active components of precious metals, and then dry and roast. The catalyst is obtained, the preparation process is cumbersome, the production time is long, the energy consumption is large, and the production efficiency is reduced

Moreover, the noble metal active components in the catalyst prepared in this way are all dispersed on the outer surface of the catalyst, which is not suitable for the catalytic combustion of acrylic acid waste gas with high water content. Causes the loss of precious metal active components and alumina coating, reducing the activity and service life of the catalyst