Preparation And Performance Study Of Nickel-Based And Cobale-Based Catalysts For Carbon Dioxide Reforming Of Methane

Carbon dioxide reforming of methane reaction can be effectively utilized to eliminate greenhouse gases and natural gas, to solve the energy crisis and improving the climate issue has broad application prospects and widespread concern.In this paper, CH4/CO2 reforming reaction catalytic system, the system examines the active ingredients, carriers, adjuvants affect the catalytic properties.In this thesis, prepared by incipient wetness impregnation CH4/CO2 reforming catalyst of the two systems, by XRD, N2 adsorption-desorption, chemisorption (H2-O2titration, H2-TPR), SEM, TEM-EDAX, TG-DSC characterizations analyzes the catalyst phase composition, texture properties, metal dispersion, reduction, morphology and coke, etc. Catalysts of CH4/CO2 reforming reaction activity and stability were the same inquiry vector different effects on the catalytic properties of the active ingredient.OMA as a carrier to prepare a series of nickel-based catalysts x% Ni/OMA (x= 5、10、15、20) and cobalt-based catalysts x%　Co/OMA (x= 5、10、5、20), the results show:OMA showed strong metal-support interaction; atmospheric, space velocity of 6000ml/g/h, at 800℃ reaction 20h, conversion and selectivity 10%Ni/OMA were not significantly reduced.The conversion rate of CH4 and CO2 remained at 98%,85%, H2/CO nearly 1.CH4 and CO2 conversion rate of 15% Co/OMA catalyst remained at 96%,35%, H2/CO approaching 1.2, it shows the catalytic activity preferably. As a whole,10% Ni/OMA catalytic activity higher than 15% Co/OMA.Because the OMA shows acidic, which will help methane adsorption and activation, but not easy to CO2 adsorption and conversion, so using Y2O3 additive as carrier to synthesis mesoporous yttrium aluminum oxide composite oxide (YAG), with YAG as the carrier prepared a series of nickel-based x%Ni/YAG (x= 5,10,15,20) and cobalt-based catalysts x%Co/YAG (x= 5,10,15,20) for carbon dioxide reforming of methane reaction. It is found that yttrium is added to improve the dispersion of the metal catalyst, reducing the reduction temperature of the active mental and enhance the performance of the catalyst to resistance carbon deposition, determined the optimum reaction temperature was 800℃. A series of nickel-based catalysts elect 20Ni/YAG.Conversion rate of CH4, CO2 of 20Ni/YAG catalyst remained at 98% and 85%. CH4, CO2 conversion rate of 15% Co/YAG reach 95% in percent,35 in percent and less amount of carbon deposition.Under the same reaction conditions, The catalytic activity of 20%Ni/YAG is better than 15Co/YAG and less the amount of carbon deposit.