1% Pt/Al 2O 3 and 1% Pt/CeO 2 are markedly activated by the deposition of a large quantity of FeO x, about 100 wt% in Fe with respect to the supports. In contrast, the activity of a Ru/Al 2O 3 catalyst was completely suppressed by the deposition of FeO x, but a Ru-Pt/Al 2O 3 was markedly activated by the FeO x. The activation depends on the sequence of the deposition, that is, no pronounced activation was observed on the Pt supported on a FeO x/Al 2O 3 as well as on the Pt codeposited with a small amount of Fe on A1 2O 3, that is, the activity was almost equal to that of the Pt/Al 2O 3. The XPS analysis of the Pt/CeO 2 and FeO x/Pt/CeO 2 proved that the Pt is effectively covered with the FeO x. Selectivity for the oxidation of CO in H 2 was also improved on the FeO x/Pt/Al 2O 3 and FeO x/Pt/CeO 2 catalysts and it is rather independent of the conversion. In conformity with the feature of the FeO x/Pt/Al 2O 3 and FeO x/Pt/CeO 2 catalysts, we deduced that the deposited FeO x is activated by the Pt and the FeO x is responsible for the selective oxidation of CO.
|Number of pages||7|
|Publication status||Published - 2004 Feb 1|
- Activation of Fe O
- Activation of Pt/Al O and Pt/CeO catalyst by Fe O
- Selective oxidation of CO in H
- Synergistic effect of Fe O
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