Catalytic activity of a 1 wt% Au/TiO 2 catalyst is markedly improved by loading a large amount of FeO x , on which the oxidation of CO in excess H 2 is selectively promoted at temperature lower than 60°C. Oxidation of CO with O 2 on the FeO x /Au/ TiO 2 catalyst is markedly enhanced by H 2 , and H 2 O moisture also enhances the oxidation of CO but its effect is not so large as the promotion by H 2 . We deduced that activation of Au/TiO 2 catalyst by loading FeO x is not caused by the size effect of Au particles but a new reaction path via hydroxyl carbonyl intermediate is responsible for the superior activity of the FeO x /Au/TiO 2 catalyst.KEY WORDS: activation of Au/TiO 2 by loading FeO x ; oxidation of CO; enhancement by H 2 ; enhancement by H 2 O; selective oxidation of CO in H 2 .

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The Fe atoms were deposited on the Si(111)-7 × 7 surface, which has been saturated with the C2H5OH molecules. Then, the Fe clusters were formed on Si(111)-7 × 7-C2H5OH surface and in situ observed by the scanning tunneling microscopy (STM). The STM images showed that with the increase of Fe clusters, the size of clusters was about 5 nm and they self-assembled in straightly linked chain crossing the step to lower or upper terrace. X-ray photoelectron spectroscopy (XPS) was in situ carried out on the surface of Fe/Si(111)-7 × 7-C2H5OH samples before and after the introduction of thin air (4.5 × 10-2 Langmuir) into the STM chamber. The XPS results showed that the Fe clusters are stable in the abovementioned thin air condition at room temperature. Based on the STM and XPS results, the driving force making one-dimensional straightly linked chain structure might be the magnetic force of the Fe clusters. The formation of straightly linked Fe clusters chains suggests the formation of single magnetic domain Fe clusters.PACS07.79.Cz, 81.15.-z, 75.75.Fk