Preparation method and application of precious metal loaded type cobalt oxide nano catalyst

Abstract

The invention provides a multi-component precious metal loaded type nano catalyst in which cobalt oxide is loaded to an oxide carrier, a preparation method and application thereof. The preparation method is characterized in that a coprecipitation method is carried out; precious metal crystal seeds are loaded on an alkaline cobalt carbonate nanoparticle precursor in an ethylene glycol system; the reacted product is centrifugally dried to obtain precious metal loaded type cobalt oxide nanoparticles. According to the preparation method, the precious metal loaded cobalt oxide with a heterostructure is synthesized, so that the essence and composition of active sites of the precious metal loaded type cobalt oxide nano catalyst are influenced; the prepared materials are loaded on the oxide carrier through a liquid-phase mixing method, so that the dispersing degree of the precious metal loaded type cobalt oxide can be improved, and moreover, the problem of high cost caused by previous metal can be reduced. The preparation method of such material is simple and easy to operate, consistent in shape, high in stability, and low in cost, and shows high methane low-temperature oxidizing activity while being applied to methane combustion reaction, and has a certain industrial application prospect.

Description

technical field [0001] The invention belongs to the field of chemical synthesis, in particular to a preparation method and application of a precious metal-loaded cobalt tetroxide nanometer catalyst. Background technique [0002] Due to the declining oil reserves in the world, more and more research focuses on the development of alternative energy sources, and the abundant natural gas energy has become the most promising energy source in the 21st century. However, as the main component of natural gas, methane is not only synthesized as a by-product in some industrial synthesis processes, but also is the main hydrocarbon air pollutant in natural gas fueled vehicles and natural gas power plants, and its greenhouse effect is CO 2 21 times. At present, most of the methane combustion catalysts studied need to break the C-H bond at a relatively high temperature (>400°C), which cannot meet the required temperature of the exhaust gas of a lean-burn engine. [0003] Noble metal-s...

AI Technical Summary

Problems solved by technology

At present, most of the methane combustion catalysts studied need to break the C-H bond at a higher temperature (>400°C), which cannot meet the required temperature of the exhaust gas of a lean-burn engine.

[0003] Noble metal-supported catalysts show good activity for the low-temperature combustion reaction of methane, but this type of catalyst does not have good stability at high temperatures, and noble metals are prone to loss and sintering at higher temperatures, resulting in a decrease in catalyst activity

Supporting noble metals by traditional impregnation methods cannot solve these problems well, because this method generally lacks the interaction between noble metals and supports.

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