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X.K. Wang. N. F. Shen and G.J Lei(Dept. of Materials Science and Engineering , Zhengzhou Institute of Technology , Zhengzhou 450002 , China)H. C. Gu(Dept. of Materials Science and Engineering. Xi'an Jiaotong University , Xi'an 710049 , China Manuscript received 27 September 1995)
金属学报(英文版)
The catalytic activity of amorphous Ni_63 Zr_32 La_5 ribbon for hydrogenation of ethyne to ethylene can be greatly enhanced when the alloy ribbon is pretreated with dilute acid solution,heated under negative atmosphere pressure and subjected to hydrogen reduction successively. The change of surface state of the ribbon during the activation has been analysed by AES and XPS. The surface of as-received ribbon is covered with a thin film of La_2 O_3. After pretreatment. the surface concentrations of both Ni and Zr increase obviously, whereas the surface concentration of La decreases markedly.Finally, on the surface of activated catalyst the Ni and NiO disperse finely on the matrix consisting of oxides of both Zr and La and a small amount of fluorides of Zr and La.
关键词: :amorphous Ni_(63) Zr_(32) La_5 alloy;catalyst;activation mechanism
