Preparation of monolithic catalyst and application method thereof

The invention relates to preparation of monolithic catalyst for a magneto-optical-thermal coupled enhanced reactor and an application method thereof. A preparation method of the catalyst comprises thefollowing steps: with metal foam materials such as foamed iron, foamed aluminum and foamed copper as carriers loading photocatalytic materials such as CeO2, BiVO4 and WO3 on the surfaces of the metalfoams by a sol-gel method, and then loading cocatalysts such as Fe-FeOx, Cu-CuOx, Ni-NiOx and Co-CoOx on the surfaces of the catalytic materials by a deposition-precipitation method to prepare the monolithic catalyst. The catalyst can be applied to a photocatalytic CO2 reduction reaction in the magnetic-optical-thermal coupled enhanced reactor. The monolithic catalyst structure prepared by the preparation method provided by the invention facilitates engineering application of the three-field coupled catalytic process; in addition, the foamed metals in the monolithic catalyst not only serve asthe carriers, but also ach