Ni Catalysts Supported on Mesoporous Nanocrystalline Magnesium Silicate in Dry and Steam Reforming Reactions

چکیده مقاله

Mesoporous nanocrystalline MgSiO3 with high surface area was synthesized by a hydrothermal method and employed as support in dry and steam reforming of methane. Ni/MgSiO3 catalysts were prepared by an impregnation method and characterized by different techniques. N2 adsorption analysis indicated that addition of nickel shifted the pore size distributions to smaller sizes. Temperatureprogrammed reduction analysis revealed that a higher nickel loading enhanced the reducibility of the catalyst. The catalytic performance was improved with increasing the nickel content. The Ni/MgSiO3 catalyst exhibited high stability in dry reforming but methane conversion declined with time-on-stream in the steam reforming reaction. Temperature-programmed oxidation profiles of spent catalysts indicated that the high amount of carbon deposited on the catalyst surface in dry and steam reforming was assigned to whisker-type carbon.