| THE EFFECT OF ADDITIVE La_2O_3 ON THE DISPERSION AND THERMOSTABILITY OF NICKEL IN METHANATION CATALYST |
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| 作者姓名： | 谢有畅 钱民协 唐有祺 |
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| 作者单位： | Group of Surface Structure，Institute of Physical Chemistry，Department of Chemistry，Peking University，Group of Surface Structure，Institute of Physical Chemistry，Department of Chemistry，Peking University，Group of Surface Structure，Institute of Physical Chemistry，Department of Chemistry，Peking University |
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| 摘 要： | It is showed that La_2O_3 and NiO could disperse on γ-Al_2O_3 as a monolayer and theirutmost monolayer capacities determined by quantitative XRD are 0.28g/100m~2 and 0.09g/100m~2respectively. In the methanation catalyst, Ni/La_2O_3/γ-Al_2O_3, the La_2O_3 is dispersed on thesurface of γ-Al_2O_3 as a monolayer and the metallic nickel crystallites are supported on thesurface with La_2O_3. It has been found by the XRD peak broadening that the average size ofnickel crystallites on the surface with La_2O_3 is much smaller than that without La_2O_3. Thismay be one of the main reasons for the increase of activity and thermostability of the La_2O_3containing methanation catalyst. This idea of modifying support surface by monolayercompound can also be applied to other catalysts.
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