In situ transient FTIR and XANES studies of the evolution of surface species in CO oxidation on Au/TiO2

The Journal of Physical Chemistry. B
Juan D HenaoHarold H Kung

Abstract

The adsorption of CO and its reaction with oxygen were investigated using a combination of in situ Fourier transform infrared spectroscopy, step response measurements in a microreactor, (18)O isotopic labeling, and X-ray absorption near edge structure spectroscopy. An as-prepared sample in which Au is present as a surface oxyhydroxy complex does not adsorb CO. On an activated sample in which only metallic Au is detected, 0.18 +/- 0.03 mol CO/(mol Au) are adsorbed on Au at -60 degrees C, which shows an IR band at 2090 cm(-1). When oxygen is present in the gas phase, this species reacts with a turnover rate of 1.4 +/- 0.2 mol CO(mol Au min)(-1), which is close to the steady-state turnover rate. In contrast, there is a very small quantity of adsorbed oxygen on Au. A small IR peak at 1242 cm(-1) appears when an activated sample is exposed to CO. It reacts rapidly with oxygen and is shifted to 1236 cm(-1) if (18)O is used. It is assigned to the possible intermediate hydroxycarbonyl.

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Citations

Nov 8, 2012·Analytical Chemistry·Nicholas A JoyMichael A Carpenter
Aug 23, 2007·Journal of the American Chemical Society·Rui CaoCraig L Hill
Jun 29, 2012·Journal of the American Chemical Society·Isabel Xiaoye GreenJohn T Yates
Sep 3, 2008·Chemical Society Reviews·Avelino Corma, Hermenegildo Garcia
Jul 16, 2008·Chemical Communications : Chem Comm·Zili WuSteven H Overbury
Apr 3, 2014·Annual Review of Physical Chemistry·Aditya Savara, Eric Weitz
Nov 15, 2012·Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry·Sergio A Jimenez-LamJuan C Fierro-Gonzalez
Dec 23, 2019·The Journal of Chemical Physics·Sunyoung OhJeong Young Park

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