Catalyst, method for producing catalyst, method for producing hydrogen-containing gas using this catalyst, hydrogen generator, fuel cell system, and silicon-supported CeZr-based oxide

摘要

An object of the present invention is to provide a catalyst or the like that has a low reaction start temperature that exhibits a self-heating function and that suppresses carbon accumulation even when the reaction is repeated. The catalyst of the present invention is a catalyst composed of a CeZr-based oxide, silicon, and a catalytically active metal. The CeZr-based oxide satisfies CexZryO2 (x + y = 1), and the silicon is 0.02%. It is characterized by satisfying a molar ratio of Si / Zr and 0.01 Si / (Ce + Zr + Si) 0.2. This catalyst can lower the reduction temperature for generating initial oxygen defects, and reduction activation treatment is possible even at about 20 ° C., which does not require any heating depending on the catalytically active metal. In addition, in the repeated hydrogen generation reaction, it is possible to suppress the deposition of generated carbon on the catalyst surface and prevent the catalyst activity from being lowered, so that the performance of the catalyst can be maintained for a long time.