Regeneration of Au/γ-Al2O3 deactivated by CO oxidation

H. S. Oh; C. K. Costello; C. Cheung; H. H. Kung; M. C. Kung

doi:10.1016/s0167-2991(01)80220-2

Regeneration of Au/γ-Al₂O₃ deactivated by CO oxidation

H. S. Oh, C. K. Costello, C. Cheung, H. H. Kung^*, M. C. Kung

^*Corresponding author for this work

Chemical and Biological Engineering

Research output: Contribution to journal › Article › peer-review

44 Scopus citations

Abstract

Au/γ-Al₂O₃ deactivates in CO oxidation, but it exhibits stable activity in selective CO oxidation (SCO) in the presence of H₂. The activity for CO oxidation could be suppressed significantly by thermal treatment at 100°C, and the lost activity could be recovered by exposing the catalyst to water vapor at room temperature. A catalyst deactivated in CO oxidation could be regenerated by exposing it to H₂ at room temperature or by running the SCO reaction over it. The results can be explained with a reaction mechanism for CO oxidation involving an active site that consists of an ensemble of metallic Au atoms and Au-hydroxyl. Deactivation in CO oxidation is due to the formation of an inactive carbonate, and deactivation by thermal treatment is due to dehydroxylation of the Au-hydroxyl.

Original language	English (US)
Pages (from-to)	375-381
Number of pages	7
Journal	Studies in Surface Science and Catalysis
Volume	139
DOIs	https://doi.org/10.1016/s0167-2991(01)80220-2
State	Published - 2001

Funding

Support by the Institute of Environmental Catalysis at Northwestern University, funded by NSF is gratefully acknowledged.

ASJC Scopus subject areas

Catalysis
Condensed Matter Physics
Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

Access to Document

10.1016/s0167-2991(01)80220-2

Cite this

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title = "Regeneration of Au/γ-Al2O3 deactivated by CO oxidation",

abstract = "Au/γ-Al2O3 deactivates in CO oxidation, but it exhibits stable activity in selective CO oxidation (SCO) in the presence of H2. The activity for CO oxidation could be suppressed significantly by thermal treatment at 100°C, and the lost activity could be recovered by exposing the catalyst to water vapor at room temperature. A catalyst deactivated in CO oxidation could be regenerated by exposing it to H2 at room temperature or by running the SCO reaction over it. The results can be explained with a reaction mechanism for CO oxidation involving an active site that consists of an ensemble of metallic Au atoms and Au-hydroxyl. Deactivation in CO oxidation is due to the formation of an inactive carbonate, and deactivation by thermal treatment is due to dehydroxylation of the Au-hydroxyl.",

author = "Oh, {H. S.} and Costello, {C. K.} and C. Cheung and Kung, {H. H.} and Kung, {M. C.}",

note = "Funding Information: Support by the Institute of Environmental Catalysis at Northwestern University, funded by NSF is gratefully acknowledged.",

year = "2001",

doi = "10.1016/s0167-2991(01)80220-2",

language = "English (US)",

volume = "139",

pages = "375--381",

journal = "Studies in Surface Science and Catalysis",

issn = "0167-2991",

publisher = "Elsevier Inc.",

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TY - JOUR

T1 - Regeneration of Au/γ-Al2O3 deactivated by CO oxidation

AU - Oh, H. S.

AU - Costello, C. K.

AU - Cheung, C.

AU - Kung, H. H.

AU - Kung, M. C.

N1 - Funding Information: Support by the Institute of Environmental Catalysis at Northwestern University, funded by NSF is gratefully acknowledged.

PY - 2001

Y1 - 2001

N2 - Au/γ-Al2O3 deactivates in CO oxidation, but it exhibits stable activity in selective CO oxidation (SCO) in the presence of H2. The activity for CO oxidation could be suppressed significantly by thermal treatment at 100°C, and the lost activity could be recovered by exposing the catalyst to water vapor at room temperature. A catalyst deactivated in CO oxidation could be regenerated by exposing it to H2 at room temperature or by running the SCO reaction over it. The results can be explained with a reaction mechanism for CO oxidation involving an active site that consists of an ensemble of metallic Au atoms and Au-hydroxyl. Deactivation in CO oxidation is due to the formation of an inactive carbonate, and deactivation by thermal treatment is due to dehydroxylation of the Au-hydroxyl.

AB - Au/γ-Al2O3 deactivates in CO oxidation, but it exhibits stable activity in selective CO oxidation (SCO) in the presence of H2. The activity for CO oxidation could be suppressed significantly by thermal treatment at 100°C, and the lost activity could be recovered by exposing the catalyst to water vapor at room temperature. A catalyst deactivated in CO oxidation could be regenerated by exposing it to H2 at room temperature or by running the SCO reaction over it. The results can be explained with a reaction mechanism for CO oxidation involving an active site that consists of an ensemble of metallic Au atoms and Au-hydroxyl. Deactivation in CO oxidation is due to the formation of an inactive carbonate, and deactivation by thermal treatment is due to dehydroxylation of the Au-hydroxyl.

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