A series of novel Ni/CeOe-Al2O3 composite catalysts were synthesized by one-step citric acid complex method, The as-synthesized catalysts were characterized by N2 physical adsorption/desorption, X-ray diffraction （XRD）, Fourier transform infrared （FT-IR） spectroscopy, hydrogen temperature-programmed reduction （Hz-TPR）, X-ray photoelectron spectroscopy （XPS） and thermogravimetry analysis （TGA）. The effects of nickel content, calcination and reaction temperatures, gas hourly space velocity （GHSV） and inert gas dilution of N2 on their performance of catalytic partial oxidation of methane （CPOM） were investigated. Catalytic activity test results show that the highest methane conversion （〉85%）, the best selectivities to carbon monoxide （〉87%） and to hydrogen （〉95%）, the excellent stability and perfect Hz/CO ratio （2.0） can be obtained over Ni/CeO2-Al2O3 with 8 wt% Ni content calcined at 700 ℃ under the reaction condition of 750 ℃, CH4/O2 ratio of 2 ： 1 and gas hourly space velocity of 12000 mL.h-1 .g-1. Characterization results show that the good catalytic performance of this composite catalyst can be contributed to its large specific surface area （~108 m2.g-1）, small crystallite size, easy reducibility and low coking rate.
A series of novel AgCl/AgaCO3 heterostructured photocatalysts with different AgCl contents （5 wt%, 10 wt%, 20 wt%, and 30 wt%） were prepared by facile coprecipitation method at room temperature. The resulting products were characterized by powder X-ray diffraction （XRD）, scanning electron microscopy （SEM）, X-ray photoelectron spectroscopy （XPS）, and ultraviolet-visible diffuse reflectance spectroscopy （UV-Vis DRS）, respectively. The photocatalytic activity of the samples was evaluated by photocatalytic degradation of methyl orange （MO） under UV light irradiation. With the optimal AgCl content of 20 wt%, the AgCl/AgECO3 composite exhibits the greatest enhancement in photocatalytic degradation efficiency. Its first-order reaction rate constant （0.67 h^-1） is 5.2 times faster than that of Ag2CO3 （0.13 h^-1）, and 16.8 times faster than that of AgCl （0.04 h^-1）. The formation of AgCl/AgaCO3 heterostructure could effectively suppress the recombination of the photo-generated electron and hole, resulting in an increase in photocatalytic activity.
