Probing the reactivity of ZnO and Au/ZnO nanoparticles by methanol adsorption: a TPD and DRIFTS study

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
Kevin KählerMartin Muhler

Abstract

The adsorption of methanol on pure ZnO and Au-decorated ZnO nanoparticles and its thermal decomposition monitored by temperature-programmed desorption (TPD) experiments and by diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS), both applied under continuous flow conditions in fixed bed reactors, is reported. Two distinguishable methoxy species are formed during methanol adsorption on ZnO differing in the C-O stretching bands. During the subsequent TPD experiments two different H(2) peaks are observed, indicating the conversion of methoxy into formate species. By applying different heating rates, activation energies of 109 kJ mol(-1) and 127 kJ mol(-1) for the selective oxidation of the two methoxy species are derived. Correspondingly, the methoxy decomposition results in two distinguishable formate species, which are identified by the asymmetric and symmetric OCO stretching bands on pure ZnO and Au/ZnO. Based on the decreased intensities of the OH bands during methanol adsorption, which are specific for the various ZnO single crystal surfaces, on the different reactivities of these surfaces, and on the formate FTIR bands observed on ZnO single crystal surfaces, the two methoxy and the corresponding formate spe...Continue Reading

References

Apr 5, 2005·Angewandte Chemie·Melanie KurtzChristof Wöll
Jan 19, 2006·Journal of the American Chemical Society·Massimiliano ComottiFerdi Schüth
Nov 29, 2008·Physical Chemistry Chemical Physics : PCCP·Heshmat NoeiMartin Muhler

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Citations

Jul 23, 2011·Langmuir : the ACS Journal of Surfaces and Colloids·Rose E RutherRobert J Hamers
Mar 27, 2015·Physical Chemistry Chemical Physics : PCCP·Alexander LükenJennifer Strunk
May 10, 2017·Physical Chemistry Chemical Physics : PCCP·Lanying Jin, Yuemin Wang
Dec 1, 2017·Physical Chemistry Chemical Physics : PCCP·Xiaodong ZhuEric I Altman
Jun 21, 2012·Advanced Materials·Hou Ran LowTimothy John White
Jul 20, 2021·The Journal of Physical Chemistry. C, Nanomaterials and Interfaces·Lukasz WolskiMohamad El-Roz
Apr 21, 2011·The Journal of Physical Chemistry. a·J KissCh Wöll

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