| abstract |
PROBLEM TO BE SOLVED: To provide a catalyst having both high catalytic activity in a low temperature range and high stability against temperature change as a carbon monoxide shift reaction catalyst. A chemical formula La 2-x A x Cu 1 -y B y O 4-δ (A in the formula is selected alkaline earth metal elements, from the group consisting of alkali metal elements, at least one element , B represents at least one element selected from Li and Mg, x is 0 ≦ x ≦ 0.2, y is 0 ≦ y ≦ 0.2, and δ is oxygen Hydrogen 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 shift reaction catalyst that reforms carbon monoxide remaining in a fuel using at least a shift reaction. [Selection figure] None |