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Low temperature oxidation of CO using heterogeneous catalysts has been intensively investigated to establish methods to preferentially oxidize CO in H2rich gas1), clean air, and lower automotive emissions2). Conventional Pt catalysts generally require temperatures above 100 °C to oxidize CO, whereas Au nanoparticle catalysts with appropriate supports can catalyze CO oxidation at low temperatures even below 0 °C3). The mechanism of CO oxidation reaction is among the central problems remaining to be solved regarding supported Au catalysts. Many reaction mechanisms have been proposed for CO oxidation on the Au catalysts. Au-support interactions are believed to be important: for example, reactions at the perimeters of Au nanoparticles (AuNPs)4)~8), strain induced at Ausupport interfaces9),10), and charging of AuNPs via electron transfer from defects on surfaces11). On the other hand, gold-only mechanisms have also been suggested: for example, effects of low-coordination sites12)~15) and thickness of Au islands on support surfaces16),17). The second section of this review summarizes our approach to the clarification of CO oxidation mechanisms based on the preparation and structural analysis of size-selected Au nanoparticle catalysts18)~21). Generally, conventional Pt catalysts require temperatures above 100 °C to catalyze CO oxidation, but various additives have been proposed for Pt catalysts22)~25) to realize CO oxidation at lower temperatures, of which iron is one of the most common additives26)~30). Promotional effects in iron-doped supported Pt catalysts have been attributed to either activation of oxygen atoms on Fe sites (bimetallic effect)31),32) or lower adsorption energy of CO over Pt surfaces27),29). A recent report by Fu et al. revealed that at coordinatively unsaturated ferrous (CUF) sites formed at boundaries between FeOx and the Pt(111) surface, O2 molecules adsorb and then cleave into oxygen atoms with a very low activation barrier33). We have recently reported that Pt nanoparticles (PtNPs) form efficient contacts with iron oxides, leading to high CO oxidation activity in Pt/Fe-containing Al2O3 catalysts which were prepared and treated with 218 Journal of the Japan Petroleum Institute, 58, (4), 218-227 (2015)

journal of the japan petroleum institute

Importance of Metal-oxide Interfaces for Low Temperature CO Oxidation over Supported Au and FeO&lt;sub&gt;&lt;i&gt;x&lt;/i&gt;&lt;/sub&gt; Promoted Pt Catalysts