Catalyst for hydrogen generation and catalyst for purification of exhaust gas

摘要

An NOx sorption-and-reduction type catalyst is made which includes a hydrogen generating catalyst in which Rh is loaded on a support including an Al2O3-ZrO2 composite oxide. Since the Al2O3-ZrO2 composite oxide exhibits a basicity lower than ZrO2, SOX are less likely to approach so that it is possible to suppress the sulfur poisoning of Rh. Moreover, the Al2O3-ZrO2 composite oxide exhibits higher heat resistance than ZrO2, and it has a function of improving the steam reforming reaction activity of Rh in the same manner as ZrO2. Therefore, the post-durability NOx purifying ability of the NOx sorption-and-reduction type catalyst is improved.