Preparation method of small-grain-size cobalt-based aluminum oxide catalyst

Abstract

The invention discloses a preparation method of a small-grain-size cobalt-based aluminum oxide catalyst. The method comprises the steps that by adopting a sol-gel method, hydrochloric acid is adoptedas an acidity regulator, acetic acid is adopted as an interface protective agent to synthesize an alumna supporter, then, cobaltous acetate is adopted as a cobalt source, diglycol is adopted as a complexing agent, and a dipping method is adopted for manufacturing the small-grain-size cobalt-based aluminum oxide catalyst. Compared with existing cobalt-based aluminum oxide synthesized by adopting glycine and urea as complexing agents, the grain size of cobaltosic oxide in synthesized cobalt-based aluminum oxide is smaller, the number of catalyst surface active loci is increased, and the interaction strength between the supporter and active ingredients is enhanced. In addition, the cobalt-based aluminum oxide is good in thermal stability, generation of a CoAl2O4 non-active phase can be restrained within the certain temperature range, and the activity of the catalyst in the methane catalyst combustion reaction is improved. The method is easy to implement, the synthesized cobalt-based aluminum oxide can be adopted as a catalyst carrier and can also be adopted as a catalyst obtained after a methane catalysis combustion reaction, and the good application prospect is achieved.

Description

technical field [0001] The invention belongs to the technical field of preparation of catalytic materials, and in particular relates to a preparation method of a cobalt-based alumina catalyst with a small particle size. Background technique [0002] Natural gas reserves are abundant, and as a high-quality alternative energy source, it can be used in gas-fired power plants and as a power fuel for natural gas vehicles. The main component of natural gas is methane, and the emission of incompletely burned methane into the atmosphere during use will cause serious greenhouse effects, so effective purification measures need to be taken. Catalytic combustion of methane is considered to be an effective way to reduce the emission of incompletely combusted methane. The catalysts currently used are mainly divided into two categories: noble metal catalysts and non-precious metal catalysts. Although noble metal-based catalysts, especially supported Pd-based catalysts, have high methane c...

AI Technical Summary

Problems solved by technology

In view of the relatively large particles of cobalt tetroxide in the existing cobalt-based alumina catalyst, the inactive phase CoAl is easily formed when the catalyst is calcined at a higher temperature 2 o 4 To solve the technical problems, a preparation method of cobalt-based alumina catalyst with controllable particle size and ordered pores was proposed

Images