Threshold Effect of Ni/ AC in Methane Reforming with CO2
1. College of Chemical and Environmental Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China; 2. Research Institution Cleaning Energy Environment Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
Abstract In order to research the threshold effect of supported nickel catalyst for methane-carbon dioxide reforming reaction, the nickel catalysts supported on activated carbon were analyzed by nitrogen adsorption-desorption (BET) and X-ray diffraction (XRD). The effects of the solvents of dipping solution and nickel loading on the surface structure, nickel dispersion degree and dispersion threshold were studied. The results showed that when acetone was used as the solvent, the nickel dispersion degree was higher than used purity water. The effective area and dispersion threshold of active components also were increased. The calculated value with the close-packed model suggested that Ni preferred to disperse as a sub monolayer, but not a close-packed monolayer. The results of CH4-CO2 reforming experiments indicated that catalytic activity was higher by using acetone as the solvent than purity water. It showed that the threshold effect of the supported Ni/AC catalysts existed in the CH4-CO2 reforming.
