乙烷氧化脱氢用Ni/Al_2O_3催化剂中活性镍物种前驱体(英文)  

Precursors of active Ni species in Ni/Al_2O_3 catalysts for oxidative dehydrogenation of ethane

作　　者：Lucie Smoláková árka Botková Libor apek Peter Priecel Agnieszka Soltysek Martin Kout Lenka Matějová 

机构地区：[1]Department of Physical Chemistry,Faculty of Chemical Technology,University of Pardubice [2]Nanotechnology Centre,V B-Technical University of Ostrava

出　　处：《催化学报》2013年第10期1905-1913,共9页

基　　金：financial support of the project ‘Router’ Development of Research Teams at the University of Pardubice(Project No.CZ.1.07/2.3.00/30.0058);the support in the framework of the project Opportunity for Young Researchers(CZ.1.07/2.3.00/30.0016);supported by Operational Programme Education for Competitiveness and co-financed by the European Social Fund and the state budget of the Czech Republic

摘　　要：Ni/Al2O3 catalysts for oxidative dehydrogenation(ODH) of ethane were prepared by impregnation of Al2O3 with nickel acetate or nickel nitrate,and by mechanical mixing of NiO and Al2O3.The Ni-based catalysts were characterized by N2 adsorption-desorption,X-ray diffraction,diffuse reflectance UV-visible diffuse reflectance spectroscopy,and temperature-programmed reduction of hydrogen.The results showed that formation of crystalline NiO particles with a size of < 8 nm and/or non-stoichiometric NiO species in the Ni/Al2O3 catalysts led to more active species in ODH of ethane under the investigated reaction conditions.In contrast,tetrahedral Ni species present in the catalysts led to higher selectivity for ethene.Formation of large crystalline NiO particles(22-32 nm) over Ni/Al2O3 catalysts decreased the selectivity for ethene.Ni/Al2O3 catalysts for oxidative dehydrogenation(ODH) of ethane were prepared by impregnation of Al2O3 with nickel acetate or nickel nitrate,and by mechanical mixing of NiO and Al2O3.The Ni-based catalysts were characterized by N2 adsorption-desorption,X-ray diffraction,diffuse reflectance UV-visible diffuse reflectance spectroscopy,and temperature-programmed reduction of hydrogen.The results showed that formation of crystalline NiO particles with a size of &lt; 8 nm and/or non-stoichiometric NiO species in the Ni/Al2O3 catalysts led to more active species in ODH of ethane under the investigated reaction conditions.In contrast,tetrahedral Ni species present in the catalysts led to higher selectivity for ethene.Formation of large crystalline NiO particles(22–32 nm) over Ni/Al2O3 catalysts decreased the selectivity for ethene.

关 键 词：ALUMINA ETHANE OXIDATIVE DEHYDROGENATION NICKEL species 

分 类 号：O643.36[理学—物理化学]