Deoxygenation of benzoic acid on metal oxides. I. The selective pathway to benzaldehyde

M.W. de Lange, J.G. van Ommen, Leonardus Lefferts

Research output: Contribution to journalArticleAcademicpeer-review

28 Citations (Scopus)

Abstract

The mechanism of the selective deoxygenation of benzoic acid to benzaldehyde was studied on ZnO and ZrO2. The results show conclusively that the reaction proceeds as a reverse type of Mars and van Krevelen mechanism consisting of two steps: hydrogen activates the oxide by reduction resulting in the formation of oxygen vacancies. Subsequent re-oxidation of these vacancy sites by benzoic acid yields benzaldehyde. Inhibition of the deoxygenation reaction can be achieved by addition of suitable polar compounds with a high affinity for the oxygen vacancy sites such as carbon dioxide or water. Differences in the catalytic activity and selectivity of ZnO and ZrO2 can be attributed to differences in hydrogen activation, redox properties and extent of benzoic acid coverage.
Original languageUndefined
Pages (from-to)41-49
Number of pages9
JournalApplied catalysis A: general
Volume220
DOIs
Publication statusPublished - 2001

Keywords

  • IR-37431
  • METIS-204812

Cite this