Noble metal monolithic catalyst for purifying organic waste gas and preparation method thereof

Abstract

The invention provides a noble metal monolithic catalyst for purifying organic waste gas and a preparation method thereof. The catalyst is a noble metal monolithic catalyst which uses cordierite ceramic pretreated by dilute nitric acid as a carrier and is loaded with zirconium-manganese mixed oxide serving as a first coating layer and a noble metal palladium active ingredient serving as a second coating layer. The method for preparing the catalyst comprises the following steps of: acidifying the carrier by adopting the dilute nitric acid to increase the specific surface area and the surface coarseness of the carrier, soaking and roasting a precursor loaded with zirconium and manganese serving as the first coating layer, and soaking a precursor loaded with noble metal palladium serving as the second coating layer of the main active ingredient. The catalyst has uniformly-loaded active ingredients, high catalytic performance, little using amount and low cost of noble metal, easy popularization, high catalytic combustion removal efficiency of triphenyl, polycyclic aromatic hydrocarbon and other organic waste gas and low ignition temperature and can be widely applied to the purification treatment of industrial organic waste gas.

Description

technical field [0001] The invention relates to a noble metal integral catalyst for purifying organic waste gas and a preparation method thereof. Background technique [0002] Precious metal monolithic catalysts are important catalysts in the chemical industry. This type of catalyst is widely used in catalytic reactions such as purification of volatile organic compounds, automobile exhaust purification, and flue gas denitrification. Economic efficiency has a major impact. Monolithic catalysts generally use γ-Al 2 o 3 As the first coating, the active component is used as the second coating, and the preparation method generally adopts the aqueous solution impregnation method, but γ-Al 2 o 3 The loading capacity of the catalyst is low, and it is easy to fall off, resulting in a low catalyst activity. [0003] Yin Weidong and others used cordierite honeycomb ceramics as the first carrier, γ-Al 2 o 3 Research on the removal of VOCs using the composite oxide catalyst as the...

AI Technical Summary

Problems solved by technology

Monolithic catalysts generally use γ-Al 2 o 3 As the first coating, the active component is used as the second coating, and the preparation method generally adopts the aqueous solution impregnation method, but γ-Al 2 o 3 The loading capacity of the catalyst is low, and it is easy to fall off, resulting in low catalyst activity

[0003] Yin Weidong and others used cordierite honeycomb ceramics as the first carrier, γ-Al 2 o 3 Research on the removal of VOCs using the composite oxide catalyst as the second support found that γ-Al 2 o 3 The activity of the catalyst is the best when the load is 7%-10%, and the active alumina supported by the cordierite honeycomb ceramic catalyst in the publication number CN14014116A is only 3%-5.3%, which is difficult to meet the requirements

To reach Al 2 o 3 To meet the loading requirements, researchers have tried a variety of loading methods: aluminum paste washing method, aluminum nitrate thermal decomposition method, in-situ coating method, in-situ synthesis method, etc., these methods can improve Al to a certain extent 2 o 3 load, but the operation is complicated and the degree of realization is low