REACTIONS OF ALIPHATIC-ALCOHOLS ON THE (011)-FACETED TIO2 (001) SURFACE Academic Article uri icon

abstract

  • The adsorption and decomposition of ethanol, n-propanol and isopropanol were studied by means of TPD and XPS on the {011}-facetted TiO2 (001) surface. The higher aliphatic alcohols adsorbed both molecularly and dissociatively at 200 K, but only dissociatively at 300 K. Molecularly adsorbed alcohols desorbed readily below 300 K. Adsorbed alkoxides were stable surface intermediates, and were removed at higher temperatures via two channels. Approximately 50% of surface alkoxides were removed as the parent alcohols at 365 K via recombination with surface hydroxyl species. The remaining alkoxides decomposed at temperatures higher than 500 K. The decomposition of surface alkoxides followed predominantly a net dehydration pathway to produce oleflns. For ethanol and n-propanol, net dehydrogenation to produce aldehydes was also observed. The dehydrogenation/ dehydration selectivity ratios were less than 0.25 in all cases. The peak temperatures of alkoxide decomposition products reflect the relative thermal stabilities of the alkoxides, which were in the order: isopropoxide < n-propoxide ethoxide. No bimolecular reaction products, e.g. ethers, were observed in this study. 1990.

published proceedings

  • JOURNAL OF MOLECULAR CATALYSIS

author list (cited authors)

  • KIM, K. S., & BARTEAU, M. A.

citation count

  • 91

complete list of authors

  • KIM, KS||BARTEAU, MA

publication date

  • November 1990