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Title: Effects of pretreatment conditions on CO oxidation over supported Au catalysts

Abstract

Supported gold catalysts were prepared by a deposition-precipitation method and characterized to understand the different activities for CO oxidation with different pretreatment conditions. Gold catalysts supported on Fe{sub 2}O{sub 3}, TiO{sub 2}, and Al{sub 2}O{sub 3} showed decreasing activity with increasing calcination temperatures, with the Al{sub 2}O{sub 3}-supported catalyst showing activity substantially lower than that of the other two catalysts. X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) studies showed the phase transition of gold from Au(OH){sub 3} through Au{sub 2}O{sub 3} to metallic gold with increasing calcination temperatures for all catalysts. In addition to the particle size of metallic gold, the oxidation states of gold were proven to be important for CO oxidation. The oxidized gold species were more active than metallic gold. Furthermore, facile formation of the interface between gold and support appears to be critical for high CO oxidation activity of supported gold catalysts.

Authors:
;  [1]
  1. Pohang Univ. of Science and Technology (Korea, Republic of)
Publication Date:
OSTI Identifier:
687723
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 186; Journal Issue: 1; Other Information: PBD: 15 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; CARBON MONOXIDE; OXIDATION; GOLD; CATALYTIC EFFECTS; AIR POLLUTION CONTROL; CATALYST SUPPORTS; CALCINATION; PARTICLE SIZE; VALENCE

Citation Formats

Park, E.D., and Lee, J.S. Effects of pretreatment conditions on CO oxidation over supported Au catalysts. United States: N. p., 1999. Web. doi:10.1006/jcat.1999.2531.
Park, E.D., & Lee, J.S. Effects of pretreatment conditions on CO oxidation over supported Au catalysts. United States. doi:10.1006/jcat.1999.2531.
Park, E.D., and Lee, J.S. Sun . "Effects of pretreatment conditions on CO oxidation over supported Au catalysts". United States. doi:10.1006/jcat.1999.2531.
@article{osti_687723,
title = {Effects of pretreatment conditions on CO oxidation over supported Au catalysts},
author = {Park, E.D. and Lee, J.S.},
abstractNote = {Supported gold catalysts were prepared by a deposition-precipitation method and characterized to understand the different activities for CO oxidation with different pretreatment conditions. Gold catalysts supported on Fe{sub 2}O{sub 3}, TiO{sub 2}, and Al{sub 2}O{sub 3} showed decreasing activity with increasing calcination temperatures, with the Al{sub 2}O{sub 3}-supported catalyst showing activity substantially lower than that of the other two catalysts. X-ray photoelectron spectroscopy (XPS) and X-ray absorption fine structure (XAFS) studies showed the phase transition of gold from Au(OH){sub 3} through Au{sub 2}O{sub 3} to metallic gold with increasing calcination temperatures for all catalysts. In addition to the particle size of metallic gold, the oxidation states of gold were proven to be important for CO oxidation. The oxidized gold species were more active than metallic gold. Furthermore, facile formation of the interface between gold and support appears to be critical for high CO oxidation activity of supported gold catalysts.},
doi = {10.1006/jcat.1999.2531},
journal = {Journal of Catalysis},
number = 1,
volume = 186,
place = {United States},
year = {1999},
month = {8}
}