CO SHIFT REACTION CATALYST

摘要

PROBLEM TO BE SOLVED: To provide a practical catalyst exhibiting high shift reaction activity even under a reaction condition of high space velocity and small deterioration of the activity even if being used under a condition such that the catalyst is exposed at a high temperature or the atmosphere is fluctuated.

SOLUTION: A noble metal is supported on a support composed of a multiple oxide in which ceria and alumina are dispersed in nanometer scale. It is desirable for the multiple oxide to have a characteristic that the fine pore diameter becomes 3.5-100 nm the fine pore volume becomes ≥0.20 cc/g after being fired at 800°C for 5 hr. Alumina works as a barrier among the particles of ceria to suppress the grain growth of seria. Because the decrease of the oxygen storing and releasing ability of the ceria is suppressed further in such a way, the fluctuation of the atmosphere is mitigated to suppress the grain growth of the noble metal. The grain growth of both ceria and the noble metal is suppressed.

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