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High Activity of Au/K/TiO2(110) for CO Oxidation: Alkali-Metal-Enhanced Dispersion of Au and Bonding of CO

Journal Article · · Journal of Physical Chemistry. C
 [1];  [1];  [2];  [1];  [1]
  1. Brookhaven National Lab. (BNL), Upton, NY (United States). Chemistry Dept.
  2. Central Univ. of Venezuela, Caracas (Venezuela)
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In this paper, images from scanning tunneling microscopy show high mobility for potassium (K) on an oxidized TiO2(110) surface. At low coverages, the alkali metal occupies mainly terrace sites of the o-TiO2(110) system. The results of X-ray photoelectron spectroscopy indicate that K is fully ionized. The electron transferred from K to the titania affects the reactivity of this oxide, favoring the dispersion of Au particles on the terraces of the o-TiO2(110) surface. When small coverages of K and Au are present on the o-TiO2(110) system, only a few K–Au pairs are formed and the alkali metal affects Au chemisorption mainly through the oxide interactions. Addition of K to Au/o-TiO2(110) enhances the reactivity of the system, opening new reaction paths for the adsorption and oxidation of carbon monoxide. CO can undergo disproportionation (2CO → Cads + CO2,ads) on K/o-TiO2(110) and Au/K/o-TiO2(110) surfaces. The Au–KOx interface binds CO much better than plain Au–TiO2, increasing the surface coverage of CO and facilitating its oxidation. Kinetic tests show that K promotes CO oxidation on Au/TiO2. Finally, turnover frequencies of 2.1 and 10.8 molecules (Au site)-1 s–1 were calculated for oxidation of CO on Au/o-TiO2(110) and Au/K/o-TiO2(110) catalysts, respectively.
Research Organization:
Brookhaven National Lab. (BNL), Upton, NY (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
Grant/Contract Number:
SC0012704
OSTI ID:
1430849
Report Number(s):
BNL--203369-2018-JAAM
Journal Information:
Journal of Physical Chemistry. C, Journal Name: Journal of Physical Chemistry. C Journal Issue: 8 Vol. 122; ISSN 1932-7447
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (2)

Supported Gold Nanoparticles as Catalysts for the Oxidation of Alcohols and Alkanes journal November 2019
Morphology and chemical behavior of model CsO x /Cu 2 O/Cu(111) nanocatalysts for methanol synthesis: Reaction with CO 2 and H 2 journal January 2020

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