TY - GEN
T1 - In-situ FTIR and XAS study of the evolution of surface species during transient Co oxidation on supported Au/Tio2
AU - Henao, Juan D.
AU - Caputo, Tiziana
AU - Yang, Jeff H.
AU - Kung, Mayfair C.
AU - Kung, Harold H.
PY - 2005/1/1
Y1 - 2005/1/1
N2 - Transient experiments involving the saturation of the catalyst either with CO or O2, followed by admission of O2 or CO, were performed. Exposure of the activated catalysts to 10 mbar of CO at -60°C led to the formation of CO adsorbed species over only 13% of the gold. Admission of 25 mbar of O2 to the CO-saturated catalyst induced drastic changes on the nature and population of surface species. CO2 was readily formed at the expense of the highly active CO-Au species (2091/cm), at a turnover frequency (TOF) of 1.4 mole/mole Au-min. CO2 production was spread over a longer time scale, with a maximum TOF of 1 mole/mole Au-min. Whether the catalyst is initially saturated with CO or O2 before admitting the other reactant did not affect the total amount of CO2 generated. Transformation of CO into CO2 entailed a hydroxocarbonyl intermediate characterized by an absorption band at 1240/cm. Its rate of disappearing correlated with the rate of formation of CO2. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 1/04/2005).
AB - Transient experiments involving the saturation of the catalyst either with CO or O2, followed by admission of O2 or CO, were performed. Exposure of the activated catalysts to 10 mbar of CO at -60°C led to the formation of CO adsorbed species over only 13% of the gold. Admission of 25 mbar of O2 to the CO-saturated catalyst induced drastic changes on the nature and population of surface species. CO2 was readily formed at the expense of the highly active CO-Au species (2091/cm), at a turnover frequency (TOF) of 1.4 mole/mole Au-min. CO2 production was spread over a longer time scale, with a maximum TOF of 1 mole/mole Au-min. Whether the catalyst is initially saturated with CO or O2 before admitting the other reactant did not affect the total amount of CO2 generated. Transformation of CO into CO2 entailed a hydroxocarbonyl intermediate characterized by an absorption band at 1240/cm. Its rate of disappearing correlated with the rate of formation of CO2. This is an abstract of a paper presented at the AIChE Annual Meeting and Fall Showcase (Cincinnati, OH 1/04/2005).
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M3 - Conference contribution
AN - SCOPUS:84916941197
SN - 0816909962
SN - 9780816909964
T3 - AIChE Annual Meeting Conference Proceedings
BT - 05AIChE
PB - American Institute of Chemical Engineers
T2 - 05AIChE: 2005 AIChE Annual Meeting and Fall Showcase
Y2 - 30 October 2005 through 4 November 2005
ER -