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

S. Kanungo, Y. Su, M.F. Neira d'Angelo, J.C. Schouten, E.J.M. Hensen

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Abstract

The role of the reducing gas in the direct epoxidation of propene to propene oxide (PO) using O2 over a Au/TiO2 catalyst was studied through experiments and density functional theory calculations. It was found that PO can be obtained using both H2 and CO as co-reactants. The yield of PO was much lower with CO than that with H2. The role of the oxygen atoms of the titania support was studied by quantum-chemical investigations, which show that the mechanism involving CO as a 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.

Original languageEnglish
Pages (from-to)2252-2261
Number of pages10
JournalCatalysis Science & Technology
Volume7
Issue number11
DOIs
Publication statusPublished - 7 Jun 2017

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