Abstract:
A series of MTiO
3 (M=Mg, Ca, Sr, Ba) supported Ni catalysts (with a Ni loading of 5%) for methane reforming with carbon dioxide (DRM) were prepared by the impregnation method. The Ni/MTiO
3 catalysts were characterized by XRD, N
2 sorption, H
2-TPR, CO
2-TPD, XPS and TG; the effect of alkaline earth metals (
M) on the catalytic performance of Ni/MTiO
3 in the DRM was then investigated. The results indicate that the metal-support interaction, the surface Ni atomic concentration and the mobility of lattice oxygen species on the Ni/MTiO
3 catalysts are related to the alkaline earth metal M used in the MTiO
3 supports. The Ni/CaTiO
3 catalyst shows superior performance in DRM to other catalysts, which is ascribed to the strong metal-support interaction, large amount of reduced active Ni and relatively high mobility of lattice oxygen species. In contrast, the SrTiO
3 support has a relatively large particle size, leading to poor Ni dispersion on the Ni/SrTiO
3 catalyst as well as weak metal-support interaction, low lattice oxygen mobility, and less surface active Ni atoms; as a result, the Ni/SrTiO
3 catalyst exhibits relatively poor performance in DRM.