Oxygen and CO adsorption on Au/SiO2 catalysts prepared by magnetron sputtering: The role of oxygen storage

Xiaolin Zheng; Gabriel M. Veith; Evgeniy Redekop; Cynthia S. Lo; Gregory S. Yablonsky; John T. Gleaves

doi:10.1021/ie100547f

Oxygen and CO adsorption on Au/SiO₂ catalysts prepared by magnetron sputtering: The role of oxygen storage

Xiaolin Zheng, Gabriel M. Veith, Evgeniy Redekop, Cynthia S. Lo, Gregory S. Yablonsky, John T. Gleaves

Energy Storage & Conversion

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Abstract

Temporal Analysis of Products (TAP) reactor system was used to investigate CO oxidation behavior on Au/SiO₂ catalysts prepared via the physical vapor deposition method of magnetron sputtering. Au/SiO₂ catalysts are a valuable model system for studying the reactivity of Au nanoparticles, as the SiO₂ support plays little role in the reaction. The adsorption of CO on the catalyst was studied at different temperatures under TAP vacuum conditions. The heat of CO adsorption estimated from TAP results by moment analysis is -24.39 ± 3.70 kJ/mol. Multipulse TAP experiments showed the important dependency between the oxygen pretreatment pressure (UHV to 33.66 psia) and catalytic activity for CO oxidation. The observed kinetic behavior indicates that oxygen consumed by CO can be replenished by oxygen stored in a reservoir, which is filled during pretreatment. The oxygen pretreatment pressure determines the amount of oxygen stored in the reservoir. The kinetic behavior indicates that oxygen is stored in the gold subsurface or at the Au/SiO ₂ interface, and that the active oxygen species is atomically adsorbed oxygen.

Original language	English
Pages (from-to)	10428-10437
Number of pages	10
Journal	Industrial and Engineering Chemistry Research
Volume	49
Issue number	21
DOIs	https://doi.org/10.1021/ie100547f
State	Published - Nov 3 2010

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title = "Oxygen and CO adsorption on Au/SiO2 catalysts prepared by magnetron sputtering: The role of oxygen storage",

abstract = "Temporal Analysis of Products (TAP) reactor system was used to investigate CO oxidation behavior on Au/SiO2 catalysts prepared via the physical vapor deposition method of magnetron sputtering. Au/SiO2 catalysts are a valuable model system for studying the reactivity of Au nanoparticles, as the SiO2 support plays little role in the reaction. The adsorption of CO on the catalyst was studied at different temperatures under TAP vacuum conditions. The heat of CO adsorption estimated from TAP results by moment analysis is -24.39 ± 3.70 kJ/mol. Multipulse TAP experiments showed the important dependency between the oxygen pretreatment pressure (UHV to 33.66 psia) and catalytic activity for CO oxidation. The observed kinetic behavior indicates that oxygen consumed by CO can be replenished by oxygen stored in a reservoir, which is filled during pretreatment. The oxygen pretreatment pressure determines the amount of oxygen stored in the reservoir. The kinetic behavior indicates that oxygen is stored in the gold subsurface or at the Au/SiO 2 interface, and that the active oxygen species is atomically adsorbed oxygen.",

author = "Xiaolin Zheng and Veith, {Gabriel M.} and Evgeniy Redekop and Lo, {Cynthia S.} and Yablonsky, {Gregory S.} and Gleaves, {John T.}",

year = "2010",

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doi = "10.1021/ie100547f",

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T1 - Oxygen and CO adsorption on Au/SiO2 catalysts prepared by magnetron sputtering

T2 - The role of oxygen storage

AU - Zheng, Xiaolin

AU - Veith, Gabriel M.

AU - Redekop, Evgeniy

AU - Lo, Cynthia S.

AU - Yablonsky, Gregory S.

AU - Gleaves, John T.

PY - 2010/11/3

Y1 - 2010/11/3

N2 - Temporal Analysis of Products (TAP) reactor system was used to investigate CO oxidation behavior on Au/SiO2 catalysts prepared via the physical vapor deposition method of magnetron sputtering. Au/SiO2 catalysts are a valuable model system for studying the reactivity of Au nanoparticles, as the SiO2 support plays little role in the reaction. The adsorption of CO on the catalyst was studied at different temperatures under TAP vacuum conditions. The heat of CO adsorption estimated from TAP results by moment analysis is -24.39 ± 3.70 kJ/mol. Multipulse TAP experiments showed the important dependency between the oxygen pretreatment pressure (UHV to 33.66 psia) and catalytic activity for CO oxidation. The observed kinetic behavior indicates that oxygen consumed by CO can be replenished by oxygen stored in a reservoir, which is filled during pretreatment. The oxygen pretreatment pressure determines the amount of oxygen stored in the reservoir. The kinetic behavior indicates that oxygen is stored in the gold subsurface or at the Au/SiO 2 interface, and that the active oxygen species is atomically adsorbed oxygen.

AB - Temporal Analysis of Products (TAP) reactor system was used to investigate CO oxidation behavior on Au/SiO2 catalysts prepared via the physical vapor deposition method of magnetron sputtering. Au/SiO2 catalysts are a valuable model system for studying the reactivity of Au nanoparticles, as the SiO2 support plays little role in the reaction. The adsorption of CO on the catalyst was studied at different temperatures under TAP vacuum conditions. The heat of CO adsorption estimated from TAP results by moment analysis is -24.39 ± 3.70 kJ/mol. Multipulse TAP experiments showed the important dependency between the oxygen pretreatment pressure (UHV to 33.66 psia) and catalytic activity for CO oxidation. The observed kinetic behavior indicates that oxygen consumed by CO can be replenished by oxygen stored in a reservoir, which is filled during pretreatment. The oxygen pretreatment pressure determines the amount of oxygen stored in the reservoir. The kinetic behavior indicates that oxygen is stored in the gold subsurface or at the Au/SiO 2 interface, and that the active oxygen species is atomically adsorbed oxygen.

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SN - 0888-5885

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JO - Industrial and Engineering Chemistry Research

JF - Industrial and Engineering Chemistry Research

IS - 21

ER -

Oxygen and CO adsorption on Au/SiO₂ catalysts prepared by magnetron sputtering: The role of oxygen storage

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