Selective hydrogenation of acetylene on SiO_2-supported Ni-Ga alloy and intermetallic compound
Selective hydrogenation of acetylene on SiO_2-supported Ni-Ga alloy and intermetallic compound作者机构:Tianjin Key Laboratory of Applied Catalysis Science and TechnologyDepartment of Catalysis Science and EngineeringSchool of Chemical Engineering and TechnologyTianjin University
出 版 物:《Journal of Energy Chemistry》 (能源化学(英文版))
年 卷 期:2019年第28卷第2期
页 面:40-49页
核心收录:
学科分类:0820[工学-石油与天然气工程] 0808[工学-电气工程] 081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0827[工学-核科学与技术] 070303[理学-有机化学] 0703[理学-化学]
基 金:supported by the National Natural Science Foundation of China (21576193)
主 题:Selective hydrogenation Acetylene Ni-Ga alloy Ni3Ga intermetallic compound
摘 要:Ni/Si O_2 and bimetallic Ni_xGa/SiO_2 catalysts with different Ni/Ga atomic ratios(x = 10~2) were investigated for the selective hydrogenation of *** was found that Ni_xGa/SiO_2 showed higher selectivity to ethylene than Ni/Si O_*** is attributed to the formation Ni-Ga alloy and Ni3 Ga intermetallic compound(IMC) where there was a charge transfer from Ga to Ni,which is favorable for reducing the adsorption strength and amount of ethylene on Ni *** a result,the over-hydrogenation,the C–C bond hydrogenolysis and the polymerization were suppressed,and subsequently the selectivity to ethylene was *** the decrease of Ni/Ga atomic ratio,the activity and stability of the Ni_xGa/SiO_2 catalysts increased first and then decreased,while the ethylene selectivity tended to ***_5 Ga/SiO_2 exhibited the best *** the conditions of 180 °C,0.1 MPa,and a reactant(1.0 vol% acetylene,5.0 vol% H_2 and 94 vol% N_2) with the space velocity of 36,000 m L h^(-1) g^(-1),the acetylene conversion maintained at 100% on Ni_5 Ga/SiO_2 during 120 h time on stream and the selectivity to ethylene was 75%~81%after reaction for 68 *** was also found that the formation of Ni-Ga alloy and Ni_3 Ga IMC suppressed the incorporation of carbon to form NiCx,subsequently enhancing the catalyst ***,with increasing the Ga content,the catalyst acid amount and strength tended to increase,which promoted the polymerization and carbon deposition and so the catalyst deactivation.