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Citation: Jin Xiang-Lin, Ge Zhi-Hong, Chen Bao-Xin, Zhao Ya-Qin, Lu Kun-Quan. Surface Dispersion Studies of Bifunctional NiO-MoO₃/γ-Alumina Catalyst by EXAFS[J]. Acta Physico-Chimica Sinica, ;1990, 6(03): 347-349. doi: 10.3866/PKU.WHXB19900318 shu

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

1.
Institute of Physical Chemistry, Peking University, China; Institute of Physics, Academia Sinica, Beijing

Received Date: 10 October 1988
Available Online: 15 June 1990

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

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