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题名: Selective hydrogenation of acetylene in an ethylene-rich stream over silica supported Ag-Ni bimetallic catalysts
作者: Pei, Guang Xian1, 2;  Liu, Xiao Yan1;  Wang, Aiqin1;  Su, Yang1;  Li, Lin1;  Zhang, Tao1
关键词: Ni ;  Ag ;  Acetylene ;  Selective hydrogenation ;  Excess ethylene
刊名: APPLIED CATALYSIS A-GENERAL
发表日期: 2017-09-05
DOI: 10.1016/j.apcata.2017.07.041
卷: 545, 页:90-96
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Life Sciences & Biomedicine
类目[WOS]: Chemistry, Physical ;  Environmental Sciences
研究领域[WOS]: Chemistry ;  Environmental Sciences & Ecology
英文摘要: Semi-hydrogenation of acetylene in an ethylene-rich stream is an industrially important process. Recent work on the purification of ethylene mainly focuses on the modification of Pd catalysts; little attention has been paid to the development of alternative catalysts with low-cost metals. Herein, a series of Ag-Ni/SiO2 bimetallic catalysts, with varied Ni/Ag atomic ratios, were prepared by wetness co-impregnation method. Their activity for the selective hydrogenation of acetylene in an ethylene-rich stream was evaluated, which showed that the introduction of Ag decreased the formation of both ethane and methane, thus increased the ethylene selectivity. The ethylene selectivity over the AgNi0.25/SiO2 catalyst was increased by > 600% when compared with the corresponding monometallic Ni-0.25/SiO2 as well as the simple physical mixture of the monometallic Ag/SiO2 and Ni-0.25/SiO2 catalysts. As was verified by a combination of the X-ray diffraction, high angular annular dark field scanning transmission electron microscopy, energy-dispersive X-ray spectroscopy under scanning transmission electron microscopy results, decreased Ni content induced the sintering of the bimetallic nanoparticles while with uniform dispersion. Temperature-programmed reduction results demonstrated that, compared with the corresponding monometallic catalysts, both the reduction of AgOx and NiOx were promoted in the Ag-Ni/SiO2 bimetallic catalysts. In-situ Fourier-transform infrared spectroscopy results also illustrated obvious interaction between Ag and Ni. The contact between Ag and Ni may account for the enhanced ethylene selectivity.
关键词[WOS]: PD CATALYSTS ;  CHEMOSELECTIVE HYDROGENATION ;  UNSATURATED-HYDROCARBONS ;  ALKYNE HYDROGENATION ;  PALLADIUM CATALYSTS ;  CU/AL2O3 CATALYSTS ;  NICKEL-CATALYSTS ;  DIMETHYL OXALATE ;  ALLOY CATALYSTS ;  EXCESS ETHYLENE
语种: 英语
WOS记录号: WOS:000410252900011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/149967
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, Dalian Inst Chem Phys, State Key Lab Catalysis, IChEM Collaborat Innovat Ctr Chem Energy Mat, Dalian 116023, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China

Recommended Citation:
Pei, Guang Xian,Liu, Xiao Yan,Wang, Aiqin,et al. Selective hydrogenation of acetylene in an ethylene-rich stream over silica supported Ag-Ni bimetallic catalysts[J]. APPLIED CATALYSIS A-GENERAL,2017,545:90-96.
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