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

doi:10.1039/c5cp03550c

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

Technical University of Munich

Research output: Contribution to journal › Article › peer-review

43 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 language	English
Pages (from-to)	22809-22814
Number of pages	6
Journal	Physical Chemistry Chemical Physics
Volume	17
Issue number	35
DOIs	https://doi.org/10.1039/c5cp03550c
State	Published - 30 Jul 2015
Externally published	Yes

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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.",

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AU - Walenta, Constantin A.

AU - Kollmannsberger, Sebastian L.

AU - Kiermaier, Josef

AU - Winbauer, Andreas

AU - Tschurl, Martin

AU - Heiz, Ueli

PY - 2015/7/30

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AB - 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.

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ER -

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

Abstract

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