Universal method for preparing high-stability noble metal monatomic catalyst

Abstract

The invention discloses a universal method for preparing a high-stability noble metal monatomic catalyst, and belongs to the technical field of functional materials, wherein a MCo (M is Pd, Pt, Au andthe like) bimetal nano-crystal is loaded on a commercial gamma-Al2O3 carrier, and then shock heating roasting is performed to form the noble metal monatomic catalyst. The preparation method comprises: in a dichlorobenzene system, simultaneously pyrolyzing and reducing a noble metal precursor and octacarbonyldicobalt by adopting an oil-phase one-step pyrolysis method to form MCo bimetallic particles with uniform size, and loading the metal particles onto a commercial gamma-Al2O3 carrier by adopting an impregnation method; and pushing the loaded catalyst into a tubular furnace heated to about 800 DEG C in advance, and roasting for 3 h to form the noble metal monatomic catalyst. According to the invention, the preparation process of the monatomic catalyst is simple, noble metals are in monatomic dispersion, the method has universality and is suitable for preparing various noble metal monatomic catalysts, and the obtained catalyst has good application prospects in the field of catalysis.

Description

technical field [0001] The invention relates to a universal method for preparing a high-stability noble metal single-atom catalyst, specifically preparing MCo (M=Pd, Pt, Au, etc.) alloy particles by using an oil phase one-step pyrolysis method, and then using an impregnation method to load them to commercial γ-Al 2 o 3 surface, followed by flash calcination to form noble metal single-atom catalysts. The prepared noble metal single-atom catalyst has high stability and belongs to the technical field of functional materials. Background technique [0002] Catalysts are widely used in the fields of modern chemistry, petroleum, energy and pharmaceutical industries, and environmental protection to produce chemicals and purify the environment. People's basic necessities of life are inseparable from the chemical industry, and in the production of the chemical industry, catalytic processes account for more than 80% of all chemical processes. Therefore, catalytic science and techno...

AI Technical Summary

Problems solved by technology

While single-atom catalysts have many advantages, there are also some disadvantages. For example, when the metal particles are reduced to the single-atom level, the specific surface area increases sharply, resulting in a sharp increase in the metal surface free energy. During the preparation and reaction, agglomeration coupling is very easy to form larger clusters, which leads to catalyst deactivation, etc.

Therefore, obtaining excellent stability and large loading capacity is a huge challenge in the preparation and application of single-atom catalysts.

At present, there is no literature report on the preparation of high stability noble metal single-atom catalysts by the method of rapid heating and calcination.

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