A series of Ni/SiO//2 catalysts prepared by impregnation and precipitation methods has been studied by X-ray diffraction and temperature-programmed-reduction. The results clearly indicate that the preparation methods as well as Ni metal loading have great influence on the surface Ni species. Preparation of catalysts by precipitation tends to enhance the Ni-support interaction. In impregnated catalysts, the major Ni species is bulk-like NiO at all loadings. In precipitated ones, the major NI species are nickel antigorite-like species. Surface Ni species depend on Ni loading in the case of precipitated Ni/SiO//2. This may be due to the multiple sites available on the supports.
|Number of pages||4|
|Journal||Journal of the Chinese Institute of Chemical Engineers|
|State||Published - Jan 1987|