Mesoporous nanocrystalline MgSiO 3 with high surface area was synthesized by a hydrothermal method and employed as support in dry and steam reforming of methane. Ni/MgSiO 3 catalysts were prepared by an impregnation method and characterized by different techniques. N 2 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/MgSiO 3 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.

10% Ni-MgSiO 3 10% Ni/1% MgO-MgSiO 3 10% Ni/3% MgO-MgSiO 3 10% Ni/6% MgO-MgSiO 3 TPO analysis MgO promoted catalysts exhibited higher catalytic activity and lower carbon formation compared to unpromoted catalyst in dry reforming reaction

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Nickel catalysts prepared on high‐surface‐area mesoporous MgSiO3 were synthesized and applied in methanation of CO2. N2 adsorption analysis confirmed the presence of the mesoporous structure on the synthesized samples and revealed that the increase in nickel content resulted in a shift of the pore size distributions to smaller pore sizes. Temperature‐programmed reduction analysis illustrated an improvement in reducibility of the catalysts by a higher nickel content. Catalytic results indicated enhanced CO2 conversion with the increase in nickel percentage up to 15 wt %. The catalysts with higher percentage of nickel provided lower CO2 conversion and CH4 selectivity. The %15Ni/MgSiO3 catalyst exhibited high catalytic stability under optimized conditions.