首页|Preparation of NiOx/SiO2-Al2O3 catalysts by a homogenous precipitation method and their catalytic activity for ethylene oligomerization
Preparation of NiOx/SiO2-Al2O3 catalysts by a homogenous precipitation method and their catalytic activity for ethylene oligomerization
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NiOx/SiO2-Al2O3 catalysts with different pore structures(BET specific surface area: 303-709 m~2 g~(-1),average pore size: 2.2-5.1 nm),acid properties(total amount of acid sites: 0.99-1.66 mmol g~(-1)),and NiO particle sizes(4.6-14.7 nm)were prepared,and the structural factors influencing their catalytic activity for ethylene oligomerization were studied.SiO2-Al2O3 support was prepared by means of a homogeneous precipitation method,and supports with different physicochemical properties were obtained by changing the preparation conditions.Ni was loaded by means of an impregnation method.Catalytic reactions were performed in a fixed-bed down-flow reactor operated at 300 ℃ and 0.1 MPa.NiOx/SiO2-Al2O3 catalysts prepared with the homogenous precipitation method had a higher surface area,more uniform pore size,and a larger amount of acid sites,and they showed a higher activity not only compared with NiOx/SiO2-Al2O3 catalysts prepared by means of our previous coprecipitation method but also compared with Ni-A1SBA-15,the best heterogenous catalyst for ethylene oligomerization reported to data.The catalytic activities of the NiOx/SiO2-Al2O3 catalysts strongly depended on the BET specific surface area and the amounts of acid sites.The optimal amounts of weak,medium-strength,strong,and total acid sites were 0.5,0.3,0.4,and 1.2 mmol g~(-1),respectively.Examination of the structure-activity relationships of the catalysts suggested that their catalytic activity was promoted by close contact between the Ni and acid sites.
Interdisciplinary Research Center for Catalytic Chemistry,National Institute of Advanced Industrial Science and Technology(AIST),1-1-1 Higashi,Tsukuba,Ibaraki,305-8565,Japan
Innovative Research Excellence,Power Unit & Energy,Honda R&D Co.,Ltd.,1-4-1 Chuo,Wako,Saitama,351-0113,Japan
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