Effect of pretreatment atmosphere on CO oxidation over α-Mn2O3 supported gold catalysts

Lu Cun Wang; Lin He; Yong Mei Liu; Yong Cao; He Yong He; Kang Nian Fan; Ji Hua Zhuang

doi:10.1016/j.jcat.2009.04.006

Effect of pretreatment atmosphere on CO oxidation over α-Mn₂O₃ supported gold catalysts

Lu Cun Wang
, Lin He
, Yong Mei Liu
, Yong Cao
, He Yong He
, Kang Nian Fan
, Ji Hua Zhuang

Energy & Environmental Science & Technology

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

69 Scopus citations

Abstract

The microstructural properties of Au/α-Mn₂O₃ catalysts moderately pretreated under different atmospheres, i.e., O₂, He and H₂, in relation to their activities and stabilities on CO oxidation were investigated. The highest initial activity was obtained for the He-pretreated catalyst, which, however, suffered the most severe deactivation with time on stream. Pretreatment with O₂ resulted in the best stability and had the highest steady-state activity among the three catalysts. TEM results revealed that the pretreatment has a negligible effect on the gold particle size. While the formation of moderate surface oxygen vacancies before reaction was suggested to be responsible for the highest initial activity of He-Au/α-Mn₂O₃, overreduction of the oxide support could explain the inferior activity of the H₂-pretreated catalyst. Based on the XPS and in situ DRIFTS studies, the superior performance of the O₂-pretreated O₂-Au/α-Mn₂O₃ catalyst can be attributed to the creation of a specific oxygen-enriched interface leading to an enhanced metal-support synergy.

Original language	English
Pages (from-to)	145-153
Number of pages	9
Journal	Journal of Catalysis
Volume	264
Issue number	2
DOIs	https://doi.org/10.1016/j.jcat.2009.04.006
State	Published - Jun 10 2009

Keywords

CO oxidation
Deactivation
Pretreatment atmosphere
Supported gold catalyst
α-MnO

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10.1016/j.jcat.2009.04.006

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@article{9ec3686c84cd4f3e87b42f8217d495b3,

title = "Effect of pretreatment atmosphere on CO oxidation over α-Mn2O3 supported gold catalysts",

abstract = "The microstructural properties of Au/α-Mn2O3 catalysts moderately pretreated under different atmospheres, i.e., O2, He and H2, in relation to their activities and stabilities on CO oxidation were investigated. The highest initial activity was obtained for the He-pretreated catalyst, which, however, suffered the most severe deactivation with time on stream. Pretreatment with O2 resulted in the best stability and had the highest steady-state activity among the three catalysts. TEM results revealed that the pretreatment has a negligible effect on the gold particle size. While the formation of moderate surface oxygen vacancies before reaction was suggested to be responsible for the highest initial activity of He-Au/α-Mn2O3, overreduction of the oxide support could explain the inferior activity of the H2-pretreated catalyst. Based on the XPS and in situ DRIFTS studies, the superior performance of the O2-pretreated O2-Au/α-Mn2O3 catalyst can be attributed to the creation of a specific oxygen-enriched interface leading to an enhanced metal-support synergy.",

keywords = "CO oxidation, Deactivation, Pretreatment atmosphere, Supported gold catalyst, α-MnO",

author = "Wang, \{Lu Cun\} and Lin He and Liu, \{Yong Mei\} and Yong Cao and He, \{He Yong\} and Fan, \{Kang Nian\} and Zhuang, \{Ji Hua\}",

note = "Funding Information: This work was supported by the National Natural Science Foundation of China (20633030, 20721063 and 20873026), the National Basic Research Program of China (2003CB615807), the National High Technology Research and Development Program of China (2006AA03Z336), Science and Technology Commission of Shanghai Municipality (08DZ2270500, 07QH14003) and the Committee of the Shanghai Education (06SG03).",

year = "2009",

month = jun,

day = "10",

doi = "10.1016/j.jcat.2009.04.006",

language = "English",

volume = "264",

pages = "145--153",

journal = "Journal of Catalysis",

issn = "0021-9517",

publisher = "Academic Press Inc.",

number = "2",

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T1 - Effect of pretreatment atmosphere on CO oxidation over α-Mn2O3 supported gold catalysts

AU - Wang, Lu Cun

AU - He, Lin

AU - Liu, Yong Mei

AU - Cao, Yong

AU - He, He Yong

AU - Fan, Kang Nian

AU - Zhuang, Ji Hua

N1 - Funding Information: This work was supported by the National Natural Science Foundation of China (20633030, 20721063 and 20873026), the National Basic Research Program of China (2003CB615807), the National High Technology Research and Development Program of China (2006AA03Z336), Science and Technology Commission of Shanghai Municipality (08DZ2270500, 07QH14003) and the Committee of the Shanghai Education (06SG03).

PY - 2009/6/10

Y1 - 2009/6/10

N2 - The microstructural properties of Au/α-Mn2O3 catalysts moderately pretreated under different atmospheres, i.e., O2, He and H2, in relation to their activities and stabilities on CO oxidation were investigated. The highest initial activity was obtained for the He-pretreated catalyst, which, however, suffered the most severe deactivation with time on stream. Pretreatment with O2 resulted in the best stability and had the highest steady-state activity among the three catalysts. TEM results revealed that the pretreatment has a negligible effect on the gold particle size. While the formation of moderate surface oxygen vacancies before reaction was suggested to be responsible for the highest initial activity of He-Au/α-Mn2O3, overreduction of the oxide support could explain the inferior activity of the H2-pretreated catalyst. Based on the XPS and in situ DRIFTS studies, the superior performance of the O2-pretreated O2-Au/α-Mn2O3 catalyst can be attributed to the creation of a specific oxygen-enriched interface leading to an enhanced metal-support synergy.

AB - The microstructural properties of Au/α-Mn2O3 catalysts moderately pretreated under different atmospheres, i.e., O2, He and H2, in relation to their activities and stabilities on CO oxidation were investigated. The highest initial activity was obtained for the He-pretreated catalyst, which, however, suffered the most severe deactivation with time on stream. Pretreatment with O2 resulted in the best stability and had the highest steady-state activity among the three catalysts. TEM results revealed that the pretreatment has a negligible effect on the gold particle size. While the formation of moderate surface oxygen vacancies before reaction was suggested to be responsible for the highest initial activity of He-Au/α-Mn2O3, overreduction of the oxide support could explain the inferior activity of the H2-pretreated catalyst. Based on the XPS and in situ DRIFTS studies, the superior performance of the O2-pretreated O2-Au/α-Mn2O3 catalyst can be attributed to the creation of a specific oxygen-enriched interface leading to an enhanced metal-support synergy.

KW - CO oxidation

KW - Deactivation

KW - Pretreatment atmosphere

KW - Supported gold catalyst

KW - α-MnO

UR - https://www.scopus.com/pages/publications/65649110185

U2 - 10.1016/j.jcat.2009.04.006

DO - 10.1016/j.jcat.2009.04.006

M3 - Article

AN - SCOPUS:65649110185

SN - 0021-9517

VL - 264

SP - 145

EP - 153

JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 2

ER -

Effect of pretreatment atmosphere on CO oxidation over α-Mn₂O₃ supported gold catalysts

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