Catalyst for combustion of ventilation air methane and preparation method thereof

Abstract

The invention discloses a catalyst for combustion of ventilation air methane and a preparation method thereof. The catalyst of the invention consists of an active ingredient, an active auxiliary agent and a porous carrier, wherein the active ingredient may be one or two of oxides of iron and copper or soluble salts of iron and copper; the active auxiliary agent is any one of cerium or lanthanum compounds; the porous carrier may be one or more of aluminum oxide, titanium oxide, zirconium oxide, magnesium oxide, calcium oxide, silica, aluminium silicate and magnesium silicate; and in form of oxide, the active ingredient accounts for 1 to 50 weight percent, the active auxiliary agent accounts for 1 to 30 weight percent and the carrier accounts for the balance. The catalyst of the invention has a catalytic effect on the combustion of the ventilation air methane and has the advantages that: the preparation method is simple; cost is low; methane ignition temperature and complete combustion temperature are low; and the like.

Description

technical field [0001] The invention relates to a catalyst and a preparation method thereof, in particular to a mine exhaust methane combustion catalyst and a preparation method thereof. Background technique [0002] Ventilation Air Methane (also known as mine ventilation, Ventilation Air Methane, referred to as VAM), refers to the gas carried by the wind after a large amount of ventilation in the coal mining process, and the air flow passes through the mining face and other places where the wind is used, and its methane concentration is lower than 0.75%. The amount of methane discharged into the atmosphere through exhaust air in my country is about 10-15 billion cubic meters per year, which is equivalent to 13-20 million tons of standard coal, and it is basically not used. Although the concentration of methane in exhaust gas is very low, the total amount is huge, accounting for about 81% of the total amount of methane emitted from coal mine gas in my country. Because meth...

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Problems solved by technology

[0005] However, there are two key issues with the catalysts used in the catalytic methane combustion process: thermal stability and low-temperature activity

The metal-supported catalyst applied by Ji Shengfu and others has the advantages of low pressure drop and easy modularization, but the preparation method is relatively complicated

The catalyst process evaluation conditions disclosed by Ugling Jun and others are single, and the effect in the actual exhaust gas treatment process cannot be determined

However, the perovskite catalyst studied by Hu Ruisheng et al. has a small specific surface area, and the catalytic activity of the catalyst is limited to a certain extent. The low-temperature catalytic activity is not good, and it does not deviate from the traditional preparation process through the wet-dry gel process, and the process is still relatively complicated.

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