Preparation of Mesoporous Al2O3 with High Specific Surface Area by Evaporation-induced Self-assembly Stategy and Its Application as Ni-Al2O3 Catalysts for CO2-CH4 Reforming

To improve the catalytic performance of nickel-based catalysts for carbon dioxide reforming of methane, four supports, PA0. 01, PA0. 02, PA0. 03 and PA0. 05, were prepared by evaporation-induced self-assembly strategy, and the same contents of Ni of the four corresponding catalysts were prepared by hydrothermal-precipitation method. The catalytic performance of these samples for CO2-CH4 reforming was tested at 800 degrees C. The supports and catalysts were characterized with ICP-AES, N-2 absorption-desorption method, NH3-TPD, XRD, H-2-TPR, TG-DTG and TEM techniques. It was shown that the specific surface area of PA0. 02 was large(320. 12 m(2)/g), and the corresponding PAC0. 02 catalyst with area of 280. 15 m(2)/g, which could provide more active sites and improve the activity of samples(the conversion of CH4 and CO2 of PAC0. 02 was up to 91. 92% and 94. 69%); the reduction peak area of NiAl2O4 in PAC0. 02 catalyst was higher than 80% of the total reduction area, indicating that the catalyst had better stability(the conversion of CH4 for PAC0. 02 was about 50% after 154 h experiment).