Selective oxidation of benzyl alcohol over TiO2 nanosheets with exposed {0 0 1} facets: Catalyst deactivation and regeneration

Authors:   Xiaoyang Pan, Nan Zhang, Xianzhi Fu, Yi-Jun Xu

Abstract:
Increasing interest has been devoted to synthesizing TiO₂ nanocrystals with reactive {0 0 1} facets (TiO₂- 001) as photocatalysts for potential applications, but relative research works on the photocatalytic stability of TiO₂-001 nanocrystals are rarely reported. Here, we have prepared TiO₂-001 using a facile hydrothermal method and studied its photocatalytic activity and stability toward selective oxidation of benzyl alcohol. The results show that TiO₂-001 suffers from a serious deactivation. By a series of joint techniques, we find that lots of oxygen vacancies have been formed on the surface of the used TiO₂-001, which is responsible for the loss in photoactivity of TiO₂-001. A possible formation mechanism of the oxygen vacancies on the TiO₂-001 surface is proposed. The regeneration of the catalyst can be realized by simply refluxing the used TiO₂-001 in water at 100^◦C.

Keywords:
Selective oxidation {0 0 1} facets of TiO₂
Photocatalyst deactivation
Photocatalyst regeneration

Published in: Applied catalysis A: General  (Volume 453, Pages 1-402, 26 February 2013)

Publisher: Elsevier

ISSN Information: 0926-860X

Selective oxidation of benzyl alcohol over TiO2 nanosheets with exposed {0 0 1} facets: Catalyst deactivation and regeneration

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