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Modulating the surface defects of titanium oxides and consequent reactivity of Pt catalysts

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Abstract

In heterogeneous catalysis, it is widely believed that the surface states of catalyst supports can strongly influence the catalytic performance, because active components are generally anchored on supports. This paper describes a detailed understanding of the influence of surface defects of TiO2 supports on the catalytic properties of Pt catalysts. Pt was deposited on reduced (r-), hydroxylated (h-), and oxidized (o-) TiO2 surfaces, respectively, and the different surface states of TiO2 not only lead to differences in metal dispersion, but also distinct electronic interactions between the metal and the support. The highest reactivity for catalytic CO oxidation can be achieved over the Pt catalyst supported on reduced TiO2 with surface oxygen vacancies. The turnover frequency (TOF) of this catalyst is determined to be ∼11 times higher than that of Pt supported on oxidized TiO2. More importantly, the reactivity is seen to increase in the sequence of Pt/o-TiO2 < Pt/h-TiO2 < Pt/r-TiO2, which is well consistent with the trend of the calculated Bader charge of Pt.

Graphical abstract: Modulating the surface defects of titanium oxides and consequent reactivity of Pt catalysts

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Publication details

The article was received on 24 Jun 2019, accepted on 24 Sep 2019 and first published on 27 Sep 2019


Article type: Edge Article
DOI: 10.1039/C9SC03119G
Chem. Sci., 2019, Advance Article
  • Open access: Creative Commons BY-NC license
    All publication charges for this article have been paid for by the Royal Society of Chemistry

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    Modulating the surface defects of titanium oxides and consequent reactivity of Pt catalysts

    Y. Wang, S. Liu, C. Pei, Q. Fu, Z. Zhao, R. Mu and J. Gong, Chem. Sci., 2019, Advance Article , DOI: 10.1039/C9SC03119G

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