Defect-mediated reactivity of Pt/TiO2 catalysts: the different role of titanium and oxygen vacancies.

Authors :: Xiao, Quan
Wang, Yanan
Zhao, Zhi-Jian
Pei, Chunlei
Chen, Sai
Gao, Lijun
Mu, Rentao
Fu, Qiang
Gong, Jinlong
Source :: SCIENCE CHINA Chemistry; Sep2020, Vol. 63 Issue 9, p1323-1330, 8p
Publication Year :: 2020
Abstract: 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 TiO<subscript>2</subscript> supports in the catalytic performance of supported Pt catalysts for CO oxidation. Pt was loaded on the TiO<subscript>2</subscript> supports with oxygen vacancies (V<subscript>O</subscript>-TiO<subscript>2</subscript>) and titanium vacancies (V<subscript>Ti</subscript>-TiO<subscript>2</subscript>). It was found that different defects of TiO<subscript>2</subscript> could distinctively modify the electron property of Pt and thereby CO adsorption strength. The strength of CO adsorption on Pt/V<subscript>Ti</subscript>-TiO<subscript>2</subscript> is enhanced, while that of Pt/V<subscript>O</subscript>-TiO<subscript>2</subscript> 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<subscript>Ti</subscript>-TiO<subscript>2</subscript> and Pt/V<subscript>O</subscript>-TiO<subscript>2</subscript> exhibit a higher activity than Pt supported on normal TiO<subscript>2</subscript> for CO oxidation. [ABSTRACT FROM AUTHOR]

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