Regeneration of Au/γ-Al2O3 deactivated by CO oxidation

H. S. Oh, C. K. Costello, C. Cheung, Harold H Kung, M. C. Kung

Research output: Contribution to journalArticle

40 Citations (Scopus)

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 languageEnglish
Pages (from-to)375-381
Number of pages7
JournalStudies in Surface Science and Catalysis
Volume139
Publication statusPublished - 2001

Fingerprint

Carbon Monoxide
regeneration
Oxidation
oxidation
Hydroxyl Radical
deactivation
Heat treatment
catalysts
Catalysts
Carbonates
Steam
room temperature
Water vapor
water vapor
carbonates
Thermodynamic properties
Atoms
Temperature
atoms

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Catalysis

Cite this

Oh, H. S., Costello, C. K., Cheung, C., Kung, H. H., & Kung, M. C. (2001). Regeneration of Au/γ-Al2O3 deactivated by CO oxidation. Studies in Surface Science and Catalysis, 139, 375-381.

Regeneration of Au/γ-Al2O3 deactivated by CO oxidation. / Oh, H. S.; Costello, C. K.; Cheung, C.; Kung, Harold H; Kung, M. C.

In: Studies in Surface Science and Catalysis, Vol. 139, 2001, p. 375-381.

Research output: Contribution to journalArticle

Oh, HS, Costello, CK, Cheung, C, Kung, HH & Kung, MC 2001, 'Regeneration of Au/γ-Al2O3 deactivated by CO oxidation', Studies in Surface Science and Catalysis, vol. 139, pp. 375-381.
Oh, H. S. ; Costello, C. K. ; Cheung, C. ; Kung, Harold H ; Kung, M. C. / Regeneration of Au/γ-Al2O3 deactivated by CO oxidation. In: Studies in Surface Science and Catalysis. 2001 ; Vol. 139. pp. 375-381.
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