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

摘要

The present invention provides a catalyst in which a reaction initiation temperature at which self-heating function is exhibited is low and which is capable of suppressing carbon accumulation even when a reaction is repeated. The catalyst of the present invention includes a CeZr-based oxide, silicon, and a catalytically active metal, wherein the CeZr-based oxide satisfies Ce_xZr_yO₂ (x+y=1) and the silicon satisfies molar ratios of 0.02≦Si/Zr and 0.01Si/(Ce+Zr+Si)0.2. When the catalyst is used, a reduction temperature for generating initial oxygen deficiency can be decreased. Depending on the catalytically active metal, a reduction activation treatment can be performed even at about 20° C. without any need for heating. In a repeated hydrogen generating reaction, the deposition of carbon generated on the surface of the catalyst can be suppressed, and a decrease in catalytic activity can be prevented.