Enhancement of catalyst performance in the direct propene epoxidation: a study into gold-titanium synergy

J. Chen, S.J.A. Halin, E.A. Pidko, M.W.G.M. Verhoeven, D.M. Perez Ferrandez, E.J.M. Hensen, J.C. Schouten, T.A. Nijhuis

Research output: Contribution to journalArticleAcademicpeer-review

46 Citations (Scopus)

Abstract

Enhanced productivity toward propene oxide in the direct propene epoxidation with hydrogen and oxygen over gold nanoparticles supported on titanium-grafted silica was achieved by adjusting the gold–titanium synergy. Highly isolated titanium sites were obtained by lowering the titanium loading grafted on silica. The tetrahedrally coordinated titanium sites were found to be favorable for attaining small gold nanoparticles and thus a high dispersion of gold. The improved productivity of propene oxide can be attributed to the increased amount of the interfacial AuTi sites. The active hydroperoxy intermediate is competitively consumed by epoxidation and hydrogenation at the AuTi interface. A higher propene concentration is favorable for a lower water formation rate and a higher formation rate of propene oxide. Propene hydrogenation, if occurring, can be switched off by a small amount of carbon monoxide.
Original languageEnglish
Pages (from-to)467-478
Number of pages12
JournalChemCatChem
Volume5
Issue number2
DOIs
Publication statusPublished - 2013

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