Mn and Ce doped Cu based methane combustion catalyst and preparation method thereof

Abstract

The invention provides an Mn and Ce doped Cu based methane combustion catalyst, which comprises, by mass percentage, 3% of Mn, 5% of Ce, 10% of Cu and the balance carrier gamma-Al2O3. The catalyst is prepared by step impregnation, and the preparation method includes: firstly dipping globular gamma-Al2O3 into a certain amount of manganese nitrate solution according to a load ratio order from small to large, then taking the globular gamma-Al2O3 out and conducting standing, drying, roasting and natural cooling, then dipping the globular gamma-Al2O3 into a certain amount of a cerium nitrate solution, then taking the globular gamma-Al2O3 out, and carrying out standing, drying, roasting and natural cooling to obtain an intermediate catalyst; and then dipping the intermediate catalyst into a certain amount of a copper nitrate aqueous solution, then taking the intermediate catalyst out, and carrying out standing, drying, roasting and natural cooling to obtain the Mn and Ce doped Cu based methane combustion catalyst. The methane catalyst is easily prepared, adopts non-noble metals as the raw materials, and is low in cost. In addition, the catalyst provided by the invention not only lowers the ignition temperature of methane catalysis, also enhances the high-temperature catalytic activity, and improves the whole methane catalytic activity.

Description

technical field [0001] The invention belongs to the field of catalytic materials, and specifically relates to the preparation and application of a trimetallic methane catalyst, which is mainly used for catalytic combustion of low-concentration methane gas such as coal well ventilation, industrial organic waste gas, natural gas waste gas, etc., and reduces greenhouse gas emissions. Background technique [0002] Low-concentration methane widely exists in mine ventilation. Because of its low methane concentration, it is difficult to use it. Direct emission will cause waste of resources and environmental pollution. Catalytic combustion is an effective way to utilize low-concentration methane, which can not only improve the conversion rate of low-concentration methane, but also expand the combustion limit of low-concentration methane. The key to catalytic combustion is to find cost-effective catalysts that can completely convert methane at lower temperatures. [0003] At present...

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Problems solved by technology

[0004] Patent CN101518734A discloses a La, Mn modified Pd-based catalyst and its preparation method, but this patent mainly relates to biomass energy utilization technology, the preparation method requires high temperature, and expensive precious metal materials are used, so it is difficult to utilization of scale

Patent CN101664680A discloses a rare-earth metal methane catalyst and its preparation method, but the catalyst prepared in this patent can only improve the reaction of methane at low temperature, and its high-temperature catalytic activity is average, and expensive precious metal materials are used, which cannot be used on a large scale

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