Ceramsite catalyst based on activated sludge biomass fuel ash and preparation method and application thereof

The invention discloses a ceramsite catalyst based on activated sludge biomass fuel ash and a preparation method and application thereof. The ceramsite catalyst comprises the following raw material components: 50-80 parts of activated sludge biomass fuel ash, 8-30 parts of bentonite, 5-20 parts of bauxite and 0.1-5 parts of rare earth metal salt. The preparation method comprises the following steps: mixing and granulating the raw materials to obtain a ceramsite raw material; and after drying, preheating in a reducing atmosphere at 400-600 DEG C for 15-30 minutes, and then raising the temperature to 1100-1200 DEG C for calcining. Biomass fuel ash is used as a raw material, the ash and auxiliary materials are reasonably proportioned, rare earth metal salt is doped to increase the specific surface area so as to enhance the activity of the biomass fuel ash, metal active components are activated through heat treatment in a reducing atmosphere, and resource utilization of the activated sludge biomass fuel ash is ac