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题名: Effects of pretreatment conditions on the catalytic performance of Au/ZnO catalysts for CO oxidation
作者: Shao Jian-Jun;  Zhang Ping;  Song Wei;  Huang Xiu-Min;  Xu Yi-De;  Shen Wen-Jie
关键词: Au/ZnO ;  CO oxidation ;  calcination temperature ;  pretreatment
刊名: ACTA CHIMICA SINICA
发表日期: 2007-09-28
卷: 65, 期:18, 页:2007-2013
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Multidisciplinary
研究领域[WOS]: Chemistry
英文摘要: Au/ZnO catalysts were prepared by the deposition-precipitation (DP) method. Effects of calcination temperature and pretreatment conditions on the structure and the catalytic performance of Au/ZnO catalysts were investigated for CO oxidation. For the samples calcined in 533 similar to 773 K, no diffraction peak of gold species could be detected by XRD measurement. Transmission electron microscopy (TEM) observation revealed that the particle sizes of gold were 2.7, 3.5 and 3.7 nm respectively, for the catalysts calcined at 533, 673 and 773 K. Temperature-programmed reduction (H-2-TPR) measurements further indicated that the pre-reduced gold species could be reoxidized at room temperature and the redox property of the catalyst could be enhanced through pretreatment with flowing air. However, its high redox properties still remained after several redox cycles. The result of CO oxidation on the catalytic behavior of the Au/ZnO catalysts was strongly influenced by the particle size and the surface area of the catalyst. The highly dispersed Au/ZnO catalyst with larger surface area and the least particle size can be prepared by the deposition-precipitation calcined at 533 K, resulting in the most promising activity and stability for CO oxidation. 95% CO conversion could be achieved after 300 h time-on-stream even though the feed gas contained 3.1 vol.% of water vapor.
关键词[WOS]: LOW-TEMPERATURE OXIDATION ;  SUPPORTED AU CATALYSTS ;  CARBON-MONOXIDE ;  GOLD CATALYSTS ;  AMBIENT-TEMPERATURE ;  AU/ZRO2 CATALYST ;  ROOM-TEMPERATURE ;  ZIRCONIA ;  DEACTIVATION ;  AU/AL2O3
语种: 英语
WOS记录号: WOS:000249931300014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140490
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Acad Armored Force Engn, Natl Key Lab Remfg, Beijing 100072, Peoples R China
2.Chinese Acad Sci, Dalian Inst Chem Phys, State Key Lab Catalysis, Dalian 116023, Peoples R China

Recommended Citation:
Shao Jian-Jun,Zhang Ping,Song Wei,et al. Effects of pretreatment conditions on the catalytic performance of Au/ZnO catalysts for CO oxidation[J]. ACTA CHIMICA SINICA,2007,65(18):2007-2013.
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