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Epoxidation of propene using Au/TiO2: on the difference between H2 and CO as co-reactant

Abstract

The role of the reducing gas in the direct epoxidation of propene to propene oxide (PO) using O2 over Au/TiO2 catalyst was studied by experiments and density functional theory calculations. It was found that PO can be obtained using both H2 and CO as co-reactant. The yield of PO was much lower with CO than with H2. The role of oxygen atoms of the titania support was investigated by quantum-chemical investigations, which show that the mechanism involving CO as co-reactant should proceed via surface oxygen vacancies, whereas with H2 the well accepted pathway involving OOH is favored. Steady-state isotopic transient kinetic analysis experiments demonstrate that support oxygen atoms are involved in PO formation when CO is used as the co-reactant.

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Publication details

The article was received on 18 Mar 2017, accepted on 19 Apr 2017 and first published on 21 Apr 2017


Article type: Paper
DOI: 10.1039/C7CY00525C
Citation: Catal. Sci. Technol., 2017, Accepted Manuscript
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    Epoxidation of propene using Au/TiO2: on the difference between H2 and CO as co-reactant

    S. Kanungo, Y. Su, J. C. Schouten and E. J.M. Hensen, Catal. Sci. Technol., 2017, Accepted Manuscript , DOI: 10.1039/C7CY00525C

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