Abstract
Au/TiO2 is a highly active catalyst for CO oxidation when Au is dispersed as nanoparticles. However, its catalytic activity is suppressed by residual halide. Using a combination of in-situ FTIR spectroscopy, X-ray absorption spectroscopy, and microreactor studies, changes occurring at the active site upon addition of NaBr to reduced and unreduced catalyst were monitored. The active site is Au0, therefore the unreduced catalyst is inactive. Binding of bromide to Au3+ in the unreduced catalyst inhibited reduction to Au0, thereby preventing activation of the catalyst. Bromide also bound to Au0 sites on the reduced catalyst, inhibiting CO adsorption and activation, resulting in lost catalytic activity. In addition to binding to the Au particles, the bromide also mobilized them, resulting in significantly accelerated agglomeration.
| Original language | English |
|---|---|
| Title of host publication | ACS National Meeting Book of Abstracts |
| Publication status | Published - 2007 |
| Event | 233rd ACS National Meeting - Chicago, IL, United States Duration: Mar 25 2007 → Mar 29 2007 |
Other
| Other | 233rd ACS National Meeting |
|---|---|
| Country | United States |
| City | Chicago, IL |
| Period | 3/25/07 → 3/29/07 |
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ASJC Scopus subject areas
- Chemistry(all)
Cite this
Poisoning of the Au/TiO2 active site for CO oxidation by NaBr. / Oxford, Sean M.; Henao, Juan; Yang, Jeff H.; Miller, Jeffrey T.; Kung, Mayfair C.; Kung, Harold H.
ACS National Meeting Book of Abstracts. 2007.Research output: Chapter in Book/Report/Conference proceeding › Conference contribution
}
TY - GEN
T1 - Poisoning of the Au/TiO2 active site for CO oxidation by NaBr
AU - Oxford, Sean M.
AU - Henao, Juan
AU - Yang, Jeff H.
AU - Miller, Jeffrey T.
AU - Kung, Mayfair C.
AU - Kung, Harold H
PY - 2007
Y1 - 2007
N2 - Au/TiO2 is a highly active catalyst for CO oxidation when Au is dispersed as nanoparticles. However, its catalytic activity is suppressed by residual halide. Using a combination of in-situ FTIR spectroscopy, X-ray absorption spectroscopy, and microreactor studies, changes occurring at the active site upon addition of NaBr to reduced and unreduced catalyst were monitored. The active site is Au0, therefore the unreduced catalyst is inactive. Binding of bromide to Au3+ in the unreduced catalyst inhibited reduction to Au0, thereby preventing activation of the catalyst. Bromide also bound to Au0 sites on the reduced catalyst, inhibiting CO adsorption and activation, resulting in lost catalytic activity. In addition to binding to the Au particles, the bromide also mobilized them, resulting in significantly accelerated agglomeration.
AB - Au/TiO2 is a highly active catalyst for CO oxidation when Au is dispersed as nanoparticles. However, its catalytic activity is suppressed by residual halide. Using a combination of in-situ FTIR spectroscopy, X-ray absorption spectroscopy, and microreactor studies, changes occurring at the active site upon addition of NaBr to reduced and unreduced catalyst were monitored. The active site is Au0, therefore the unreduced catalyst is inactive. Binding of bromide to Au3+ in the unreduced catalyst inhibited reduction to Au0, thereby preventing activation of the catalyst. Bromide also bound to Au0 sites on the reduced catalyst, inhibiting CO adsorption and activation, resulting in lost catalytic activity. In addition to binding to the Au particles, the bromide also mobilized them, resulting in significantly accelerated agglomeration.
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M3 - Conference contribution
SN - 084127438X
SN - 9780841274389
BT - ACS National Meeting Book of Abstracts
ER -