A New Catalyst for Selective Oxidation of CO in H: Part 1, Activation by Depositing a Large Amount of FeO on Pt/AlO and Pt/CeO Catalysts

1% Pt/AlO and 1% Pt/CeO are markedly activated by the deposition of a large quantity of FeO, about 100 wt% in Fe with respect to the supports. In contrast, the activity of a Ru/AlO catalyst was completely suppressed by the deposition of FeO, but a Ru-Pt/AlO was markedly activated by the FeO. The activation depends on the sequence of the deposition, that is, no pronounced activation was observed on the Pt supported on a FeO/AlO as well as on the Pt codeposited with a small amount of Fe on AlO, that is, the activity was almost equal to that of the Pt/AlO. The XPS analysis of the Pt/CeO and FeO/Pt/CeO proved that the Pt is effectively covered with the FeO. Selectivity for the oxidation of CO in H was also improved on the FeO/Pt/AlO and FeO/Pt/CeO catalysts and it is rather independent of the conversion. In conformity with the feature of the FeO/Pt/AlO and FeO/Pt/CeO catalysts, we deduced that the deposited FeO is activated by the Pt and the FeO is responsible for the selective oxidation of CO.