Defects are ubiquitous in oxide supports and can often tune the catalytic property of supported metal catalysts. This work describes the distinct role of titanium and oxygen vacancies of TiO₂ supports in the catalytic performance of supported Pt catalysts for CO oxidation. Pt was loaded on the TiO₂ supports with oxygen vacancies (V_O-TiO₂) and titanium vacancies (V_Ti-TiO₂). It was found that different defects of TiO₂ could distinctively modify the electron property of Pt and thereby CO adsorption strength. The strength of CO adsorption on Pt/V_Ti-TiO₂ is enhanced, while that of Pt/V_O-TiO₂ becomes weaker. Additionally, the presence of defects would also promote the reducibility of catalysts. On the account of the superior redox ability, both Pt/V_Ti-TiO₂ and Pt/V_O-TiO₂ exhibit a higher activity than Pt supported on normal TiO₂ for CO oxidation.

缺陷在氧化物载体中无处不在，并且经常可以调节载体金属催化剂的催化性能。这项工作描述了TiO ₂载体的钛和氧空位在负载的Pt催化剂对CO氧化的催化性能中的独特作用。将Pt负载在具有氧空位（V _O -TiO ₂）和钛空位（V _Ti -TiO ₂）的TiO ₂载体上。发现TiO _2的不同缺陷可以显着地改变Pt的电子性质，从而改变CO的吸附强度。CO在Pt / V _Ti -TiO ₂上的吸附强度提高，而Pt / V _O-TiO ₂变弱。另外，缺陷的存在也将促进催化剂的还原性。由于优异的氧化还原能力，Pt / V _Ti -TiO ₂和Pt / V _O -TiO _2均表现出比负载普通TiO _2的Pt更高的CO氧化活性。