CO2 Reforming of CH4 over MgO-Doped Ni/MAS-24 with Microporous ZSM-5 Structure

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Mesoporous aluminosilicate with ZSM-5 structure was synthesized from ZSM-5 nanoclusters and used as support, which possessed strong acidity, large surface areas, and high hydrothermal stability. A series of 0–12 wt % MgO–10 wt % Ni/MAS-24 were prepared via a sol–gel method and characterized by XRD, N2 adsorption, FT-IR, H2-TPR, CO2-TPD, UV–vis, TG/DSC, and HRTEM techniques. The effects of catalyst composition and reaction temperature on the catalytic performance in CO2/CH4 reforming were studied. The catalytic stability over 9 wt % MgO-10Ni/MAS-24 for 60 h indicated that the conversion of CH4 and CO2 maintained 93% and 99%, respectively, the selectivity of H2 and CO for 99% at 800 °C, although the conversion of CH4 decreased to 83% in the later 30 h due to high dispersion of Ni particles via synergistic action between MgO and NiO nanoparticles as well as basic effect on the surface, which prevented Ni0 active particles from aggregating and coke formation during the CH4/CO2 reforming reaction.