Low-loaded Pd（0.05 wt.%）/Al2O3 catalysts modified by ceria were prepared by impregnation method.Gas phase hydrogenation of acrylonitrile to propionitrile was selected as probe reaction to study the effect of the lig...Low-loaded Pd（0.05 wt.%）/Al2O3 catalysts modified by ceria were prepared by impregnation method.Gas phase hydrogenation of acrylonitrile to propionitrile was selected as probe reaction to study the effect of the light rare earth element cerium on the cataltic activity and stability.Experimental results indicated that addition of a small mount of ceria improved the catalytic activity and stability greatly.The best content of ceria was 3 wt.%,and consecutive impregnation method was prior to co-impregnation method.展开更多
Ni/Al\-2O\-3 catalyst was prepared by impregnating α \|Al\-2O\-3 with Ni(NO\-3)\-2 aqueous solution, and characterized by temperature programmed reduction (TPR), X\|ray diffraction (XRD) and X\|ray photoelectron spec...Ni/Al\-2O\-3 catalyst was prepared by impregnating α \|Al\-2O\-3 with Ni(NO\-3)\-2 aqueous solution, and characterized by temperature programmed reduction (TPR), X\|ray diffraction (XRD) and X\|ray photoelectron spectroscopy (XPS) techniques. The effects of Ni content, calcination temperature and activation conditions (such as reduction temperature and time) on coke deposition on the catalyst were studied. The results showed that the interaction between Ni and Al\-2O\-3 benefits to improve the stability and the resistance to coke deposition of the catalyst, though the activity of the catalyst was decreased to a certain extent.展开更多
文摘Low-loaded Pd（0.05 wt.%）/Al2O3 catalysts modified by ceria were prepared by impregnation method.Gas phase hydrogenation of acrylonitrile to propionitrile was selected as probe reaction to study the effect of the light rare earth element cerium on the cataltic activity and stability.Experimental results indicated that addition of a small mount of ceria improved the catalytic activity and stability greatly.The best content of ceria was 3 wt.%,and consecutive impregnation method was prior to co-impregnation method.
文摘Ni/Al\-2O\-3 catalyst was prepared by impregnating α \|Al\-2O\-3 with Ni(NO\-3)\-2 aqueous solution, and characterized by temperature programmed reduction (TPR), X\|ray diffraction (XRD) and X\|ray photoelectron spectroscopy (XPS) techniques. The effects of Ni content, calcination temperature and activation conditions (such as reduction temperature and time) on coke deposition on the catalyst were studied. The results showed that the interaction between Ni and Al\-2O\-3 benefits to improve the stability and the resistance to coke deposition of the catalyst, though the activity of the catalyst was decreased to a certain extent.
基金supported by the National Natural Science Foundation of China(21067004,21263005,21003095)Science and Technology Foundation of Jiangxi Provincial Department of Education(GJJ12344)+1 种基金Program of Jiangxi Provincial Young Scientists Cultivating Object(20122BCB23015)Young Science and Technology Project of Jiangxi Province Natural Science Foundation(20133BAB21003)~~
