A kind of noble metal monolithic catalyst and preparation method thereof

Abstract

The invention discloses a noble metal integral catalyst and a preparation method thereof. The precious metal monolithic catalyst is composed of a carrier and a precious metal active component. The carrier is a cordierite honeycomb ceramic with high pore density. The active component is a precious metal loaded on a rare earth metal oxide and a transition metal oxide. The prepared precious metal monolithic catalyst has good reactivity and stability, the active components are evenly distributed, and the loading amount is controllable. It also overcomes the low bonding strength between the cordierite honeycomb ceramic carrier and the active component and the blocked channels of the cordierite honeycomb ceramic carrier. The problem of clogging of active components can be eliminated, and the preparation and deposition process of active components can be completed in a single step, which greatly simplifies the preparation process of precious metal monolithic catalysts.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and relates to a method for efficiently preparing monolithic catalysts, specifically, the method of directly depositing the generated active components on a cordierite honeycomb ceramic carrier by using an emulsion flame combustion method to form a noble metal monolithic catalyst method. Background technique [0002] Precious metal monolithic catalysts are an important class of catalysts involved in the catalytic reaction industry. They are widely used in the fields of automobile exhaust purification, industrial flue gas denitrification and desulfurization, and elimination of volatile organic compounds. Noble metal monolithic catalysts usually consist of noble metal active components, supports and coatings. Among them, the noble metal active component is the main body of the catalytic activity in the catalyst, and its distribution state and bulk properties determine the parameters s...

AI Technical Summary

Problems solved by technology

[0004] Usually, the problem of this type of catalyst in use is that the bonding strength between the carrier-coating-active component is weak, especially in the long-term harsh environment, the catalyst has low mechanical and thermal shock resistance, and the phenomenon of powder falling is serious, which leads to the long-term failure of the catalyst. Unstable activity

On the other hand, during the catalyst preparation process, the pores of the carrier cause capillary phenomena under the action of the interfacial tension of the solution, resulting in uneven dispersion of the coating and active components in the pores, and in severe cases, the presence of pore blockage, etc., affecting the catalytic performance. The mass transfer, heat transfer and momentum transfer in the process will eventually lead to a decrease in activity

Images