Effect of Structural Evolution of Gold Species Supported on Ceria in Catalyzing CO Oxidation

doi:10.1021/acs.jpcc.9b00096

CORC > 上海应用物理研究所 > 中国科学院上海应用物理研究所 > 中科院上海应用物理研究所2011-2017年

	Effect of Structural Evolution of Gold Species Supported on Ceria in Catalyzing CO Oxidation
	Wang, XL ; Fu, XP ; Wang, WW ; Ma, C ; Si, R ; Jia, CJ
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2019
卷号	123 期号:14 页码:9001—9012
关键词	CATALYTICALLY ACTIVE GOLD LOW-TEMPERATURE OXIDATION SINGLE-ATOM CATALYSTS PREFERENTIAL OXIDATION ROOM-TEMPERATURE METAL PARTICLES CARBON-MONOXIDE AU AU/TIO2 ACTIVATION
ISSN号	1932-7447
DOI	10.1021/acs.jpcc.9b00096
文献子类	期刊论文
英文摘要	The intrinsic reactivity of atomically dispersed gold catalysts for low-temperature (L-T) CO oxidation remains an elusive issue. Here, two kinds of atomically dispersed gold with different loadings supported on nanoceria prepared via a deposition precipitation method were evaluated as catalysts for L-T CO oxidation. Much distinct differences in catalyzing CO oxidation behaviors were exhibited on the two kinds of gold catalysts. These weakly anchored gold species in the 1% Au/CeO2 (1 wt % gold loading) catalyst revealed increasing reactivity under the reaction condition, while these strongly anchored ones in the 0.5% Au/CeO2 (0.5 wt % gold loading) catalyst were inactive. For the 1% Au/CeO2 catalyst, in situ diffuse reflectance infrared spectroscopy (DRIFTS) proved gold species transformation from Aun+ (1 <= n < 3) to Au delta+ (0 < delta < 1), and simultaneously, aberration-corrected scanning transmission electron microscope measurements confirmed that partial atomically dispersed gold species transformed into gold clusters. While for 0.5% Au/CeO2, atomically dispersed Aun+ (1 <= n < 3) hardly varied in catalyzing CO oxidation at room temperature (RT). CO adsorption tests by in situ DRIFTS combining with the kinetics measurements demonstrated that these formed Au delta+ sites were much superior in adsorbing CO molecules than monodispersed Aun+ atoms at RT. Therefore, the gap in capturing CO molecules intrinsically resulted in the distinct catalytic performance for clustered Au delta+ (0 < delta < 1) and atomically dispersed Aun+ (1 <= n < 3).
语种	英语
内容类型	期刊论文
源URL	[http://ir.sinap.ac.cn/handle/331007/31573]
专题	上海应用物理研究所_中科院上海应用物理研究所2011-2017年
作者单位	1.Hunan Univ, Coll Mat Sci & Engn, Changsha 410082, Hunan, Peoples R China 2.Chinese Acad Sci, Shanghai Inst Appl Phys, Shanghai Synchrotron Radiat Facil, Shanghai 201204, Peoples R China; 3.Shandong Univ, Sch Chem & Chem Engn, Key Lab Special Aggregated Mat, Key Lab Colloid & Interface Chem, Jinan 250100, Shandong, Peoples R China;
推荐引用方式 GB/T 7714	Wang, XL,Fu, XP,Wang, WW,et al. Effect of Structural Evolution of Gold Species Supported on Ceria in Catalyzing CO Oxidation[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2019,123(14):9001—9012.
APA	Wang, XL,Fu, XP,Wang, WW,Ma, C,Si, R,&Jia, CJ.(2019).Effect of Structural Evolution of Gold Species Supported on Ceria in Catalyzing CO Oxidation.JOURNAL OF PHYSICAL CHEMISTRY C,123(14),9001—9012.
MLA	Wang, XL,et al."Effect of Structural Evolution of Gold Species Supported on Ceria in Catalyzing CO Oxidation".JOURNAL OF PHYSICAL CHEMISTRY C 123.14(2019):9001—9012.