High-temperature catalytic combustion catalyst for SOFC (Solid Oxide Fuel Cell) electric pile tail gas treatment as well as preparation method and application thereof

The invention relates to a high-temperature catalytic combustion catalyst for SOFC (solid oxide fuel cell) stack tail gas treatment as well as a preparation method and application of the high-temperature catalytic combustion catalyst. The catalyst comprises a catalyst precursor and a catalyst matrix, the catalyst precursor is prepared from the following components in percentage by weight: 10 to 50 percent of sepiolite powder and 30 to 80 percent of rare earth metal modified Ce and Zr composite oxide; one or more of soluble salts of cobalt, iron and manganese, and the content of transition metal oxides of cobalt, iron and manganese is 1-20wt%; and the catalyst matrix is at least one of a cordierite ceramic matrix, Al2O3 high-temperature ceramic, ZrO2, mullite Al2O3.SiO2 and hexaaluminate. When the catalyst is used for tail gas treatment of a high-temperature methane SOFC stack, the ignition temperature is low, the complete conversion temperature is low, heat supply with stable pressure and temperature can be p