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题名: Ag Alloyed Pd Single-Atom Catalysts for Efficient Selective Hydrogenation of Acetylene to Ethylene in Excess Ethylene
作者: Pei, Guang Xian1, 2;  Liu, Xiao Yan1;  Wang, Aiqin1;  Lee, Adam F.3;  Isaacs, Mark A.3;  Li, Lin1;  Pan, Xiaoli1;  Yang, Xiaofeng1;  Wang, Xiaodong1;  Tai, Zhijun3;  Wilson, Karen3;  Zhang, Tao1
关键词: acetylene hydrogenation ;  excess ethylene ;  silver ;  Pd single-atom ;  FTIR ;  in situ XPS ;  microcalorimetry
刊名: ACS CATALYSIS
发表日期: 2015-06-01
DOI: 10.1021/acscatal.5b00700
卷: 5, 期:6, 页:3717-3725
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Physical
研究领域[WOS]: Chemistry
英文摘要: Semihydrogenation of acetylene in an ethylene-rich stream is an industrially important process. Conventional supported monometallic Pd catalysts offer high acetylene conversion, but they suffer from very low selectivity to ethylene due to overhydrogenation and the formation of carbonaceous deposits. Herein, a series of Ag alloyed Pd single-atom catalysts, possessing only ppm levels of Pd, supported on silica gel were prepared by a simple incipient wetness coimpregnation method and applied to the selective hydrogenation of acetylene in an ethylene-rich stream under conditions close to the front-end employed by industry. High acetylene conversion and simultaneous selectivity to ethylene was attained over a wide temperature window, surpassing an analogous Au alloyed Pd single-atom system we previously reported. Restructuring of AgPd nanoparticles and electron transfer from Ag to Pd were evidenced by in situ FTIR and in situ XPS as a function of increasing reduction temperature. Microcalorimetry and XANES measurements support both geometric and electronic synergetic effects between the alloyed Pd and Ag. Kinetic studies provide valuable insight into the nature of the active sites within these AgPd/SiO2 catalysts, and hence, they provide evidence for the key factors underpinning the excellent performance of these bimetallic catalysts toward the selective hydrogenation of acetylene under ethylene-rich conditions while minimizing precious metal usage.
关键词[WOS]: TIO2 SUPPORTED PD ;  BIMETALLIC CATALYSTS ;  CO OXIDATION ;  PD-AG/AL2O3 CATALYSTS ;  STRUCTURE SENSITIVITY ;  PALLADIUM CATALYSTS ;  SURFACE-STRUCTURES ;  SUBSURFACE CARBON ;  PERFORMANCE ;  NANOPARTICLES
语种: 英语
WOS记录号: WOS:000355964300059
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/146307
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.Chinese Acad Sci, State Key Lab Catalysis, iChEM Collaborat Innovat Ctr Chem Energy Mat, Dalian Inst Chem Phys, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Aston Univ, European Bioenergy Res Inst, Birmingham B4 7ET, W Midlands, England

Recommended Citation:
Pei, Guang Xian,Liu, Xiao Yan,Wang, Aiqin,et al. Ag Alloyed Pd Single-Atom Catalysts for Efficient Selective Hydrogenation of Acetylene to Ethylene in Excess Ethylene[J]. ACS CATALYSIS,2015,5(6):3717-3725.
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