The analysis of FTIR absorption spectra of CO and of12CO-13CO isotopic mixtures is reported for gold catalysts supported on a number of oxides. Relationships between the nanostructure and the CO adsorbing properties of the different gold catalysts are discussed. In particular, on titania supported gold, where particles of metallic nature are present, two kinds of surface sites do adsorb CO, the 6-coordinated corners and the 7- coordinated edges, while the terrace sites, 8 coordinated, are not able to adsorb even at 90 K. Moreover, the adsorbing sites are not isolated, but mutually interacting. On zirconia supported gold, the adsorbing sites, mutually interacting, are exposed at the surface of non metallic gold nanoclusters. Almost isolated and negatively charged gold adsorbing nanoclusters have been highlighted on the sample supported on reduced ceria, and, finally, isolated cationic sites on oxidized gold supported on a mixed ceria-titania oxide have been detected.

中文翻译：

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催化活性金位点：纳米粒子、边界位点、簇、阳离子、阴离子？12CO 和 12CO-13CO 同位素混合物的 FTIR 光谱分析

报道了对负载在多种氧化物上的金催化剂的 CO 和 12CO-13CO 同位素混合物的 FTIR 吸收光谱的分析。讨论了不同金催化剂的纳米结构与 CO 吸附性能之间的关系。特别是，在二氧化钛负载的金上，其中存在金属性质的颗粒，两种表面位点确实吸附了 CO，即 6 配位角和 7 位配位边缘，而 8 位配位的阶地位点不能吸附 CO即使在 90 K。此外，吸附位点不是孤立的，而是相互作用的。在氧化锆负载的金上，相互作用的吸附位点暴露在非金属金纳米团簇的表面。