物理化学学报 >> 1990, Vol. 6 >> Issue (03): 347-349.doi: 10.3866/PKU.WHXB19900318

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用EXAFS方法研究双功能催化剂NiO-MoO3/γ-A2O3的表面分散那

金祥林; 葛志红; 陈宝欣; 赵雅琴; 陆坤权   

  1. 北京大学物理化学研究所；中国科学院物理研究所
  • 收稿日期:1988-10-10 修回日期:1989-02-23 发布日期:1990-06-15
  • 通讯作者: 金祥林

Surface Dispersion Studies of Bifunctional NiO-MoO3/γ-Alumina Catalyst by EXAFS

Jin Xiang-Lin; Ge Zhi-Hong; Chen Bao-Xin; Zhao Ya-Qin; Lu Kun-Quan   

  1. Institute of Physical Chemistry, Peking University, China; Institute of Physics, Academia Sinica, Beijing
  • Received:1988-10-10 Revised:1989-02-23 Published:1990-06-15
  • Contact: Jin Xiang-Lin

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Abstract: The surface dispersion of bifunctional NiO-MoO_3/γ-alumina catalysts prepared by different procedures was studied with Ni-K EXAFS spectroscopy. The contents of NiO(13.6%) and MoO_3(16.5%) were the same in the three samples, which were a little higher than the monolayer dispersion capacity of each component on γ-Al_2O_3. The dispersion temperature was 450 ℃. The sample impregnated with NiO first shows that the NiO is monolayer-dispersed on γ-Al_2O_3 surface and the outer layer is MoO_3. The sample impregnated with MoO_3 and the outer layer is NiO. There is strong interaction between MoO_3 and γ-Al_2O_3 which affects the dispersion of NiO on the surface. The sample impregnated with NiO and MoO_3 simultaneously shows that the Ni is not dispersed in the form of NiO but another compound on the surface.