Ethanol photocatalysis on rutile TiO2(110): The role of defects and water

Constantin A. Walenta, Sebastian L. Kollmannsberger, Josef Kiermaier, Andreas Winbauer, Martin Tschurl, Ueli Heiz

Research output: Contribution to journalArticlepeer-review

42 Scopus citations

Abstract

In this work we present a stoichiometric reaction mechanism for the photocatalytic ethanol oxidation on TiO2(110). The reaction products are analyzed either under reaction conditions or after irradiation at lower temperatures. Water is identified as a quantitative by-product, which resides in a defect site. These water molecules cause a blocking of the defect sites which results in poisoning of the catalyst. By different preparation techniques of the TiO2(110) surface, the role of surface defects is further elucidated and the role of molecular oxygen is investigated. Based on the investigation, a complete photochemical reaction mechanism is given, which provides insights into general photon driven oxidation mechanisms on TiO2.

Original languageEnglish
Pages (from-to)22809-22814
Number of pages6
JournalPhysical Chemistry Chemical Physics
Volume17
Issue number35
DOIs
StatePublished - 30 Jul 2015
Externally publishedYes

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