Abstract: There are a lot of valuable metals such as titanium, vanadium and tungsten in the spent catalyst of ammonia selective catalytic reduction (SCR). The recycling of these metals can not only prevent the waste of valuable metal resources, but also reduce environmental pollution and the production cost of denitration catalyst. A new kind of honeycomb denitration catalyst was prepared by extrusion method with titanium dioxide mixed with acid-washed spent SCR catalyst as the carrier. The catalyst was characterized by X-ray diffraction (XRD), specific surface area analyzer (BET) and scanning electron microscope (SEM). The influence of the mixed amount of acid-washed spent SCR catalyst on the mechanical properties, denitration performance and stability of honeycomb denitration catalyst was investigated. The results showed that the crystal structure of the catalyst was not changed when the catalyst was mixed with pickling spent SCR catalyst; the specific surface area and pore volume of the catalyst decreased with the increase of the mixed amount of acid washing spent SCR catalyst;and when the amount of mixed SCR catalyst was large, the catalyst had high mechanical strength and strong anti-wear performance; when the mixed amount（w）of acid washing spent SCR catalyst was 30%, the prepared honeycomb denitration catalyst could still maintain the denitration efficiency and activity as the catalyst prepared with pure titanium dioxide, and it had good denitration stability.

Key words: spent catalyst, ammonia selective catalytic reduction, resource recovery and reuse, acid washing, denitration efficiency