On the role of gold nanoparticles in the selective photooxidation of 2-propanol over Au/TiO2

Alexander Lüken; Martin Muhler; Jennifer Strunk

doi:10.1039/c4cp05423g

On the role of gold nanoparticles in the selective photooxidation of 2-propanol over Au/TiO₂

Alexander Lüken, Martin Muhler, Jennifer Strunk

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

23 Scopus citations

Abstract

The gas-phase photooxidation of 2-propanol over Au/TiO₂ and TiO₂ was studied by infrared spectroscopy and online mass spectrometry to gain insight into the mechanism and the role of gold. The presence of O₂ was found to be essential for the formation of acetone under UV irradiation at room temperature. In the presence of gold nanoparticles the rate of acetone formation was increased compared to pure TiO₂. Baseline bending in the ATR-IR spectra was used as a tool to monitor the accumulation of excess electrons. Electron accumulation was absent in the presence of gold and O₂ suggesting that the gold nanoparticles act as co-catalysts enhancing the rate of electron transfer from TiO₂ to adsorbed O₂ species.

Original language	English
Pages (from-to)	10391-10397
Number of pages	7
Journal	Physical Chemistry Chemical Physics
Volume	17
Issue number	16
DOIs	https://doi.org/10.1039/c4cp05423g
State	Published - 28 Apr 2015
Externally published	Yes

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abstract = "The gas-phase photooxidation of 2-propanol over Au/TiO2 and TiO2 was studied by infrared spectroscopy and online mass spectrometry to gain insight into the mechanism and the role of gold. The presence of O2 was found to be essential for the formation of acetone under UV irradiation at room temperature. In the presence of gold nanoparticles the rate of acetone formation was increased compared to pure TiO2. Baseline bending in the ATR-IR spectra was used as a tool to monitor the accumulation of excess electrons. Electron accumulation was absent in the presence of gold and O2 suggesting that the gold nanoparticles act as co-catalysts enhancing the rate of electron transfer from TiO2 to adsorbed O2 species.",

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AB - The gas-phase photooxidation of 2-propanol over Au/TiO2 and TiO2 was studied by infrared spectroscopy and online mass spectrometry to gain insight into the mechanism and the role of gold. The presence of O2 was found to be essential for the formation of acetone under UV irradiation at room temperature. In the presence of gold nanoparticles the rate of acetone formation was increased compared to pure TiO2. Baseline bending in the ATR-IR spectra was used as a tool to monitor the accumulation of excess electrons. Electron accumulation was absent in the presence of gold and O2 suggesting that the gold nanoparticles act as co-catalysts enhancing the rate of electron transfer from TiO2 to adsorbed O2 species.

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On the role of gold nanoparticles in the selective photooxidation of 2-propanol over Au/TiO₂

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