| abstract |
PROBLEM TO BE SOLVED: To provide an easily usable catalyst as a carbon monoxide selective oxidation catalyst having both high catalytic activity in a low temperature range and high stability against temperature change, and having flexibility in composition and synthesis method. SOLUTION: A 2 Cu 1-y B y O 4 -δ (wherein A represents at least one element selected from the group consisting of lanthanoids, B represents Cr, Mn, Fe, Co At least one element selected from the group consisting of: y is 0 ≦ y ≦ 0.2, and δ is an oxygen deficiency or oxygen excess). At least selected carbon monoxide remaining in a hydrogen-enriched gas obtained by reforming a gas containing hydrocarbon, oxygen and water vapor, characterized by using a composite oxide having a layered perovskite structure A carbon monoxide selective oxidation catalyst that is reformed by oxidation. [Selection figure] None |