Catalytic Reforming Of Coke Oven Gas And CO₂ Over Coke Powder Loaded Ni

The natural endowment of energy structure in China is responsible for massive emissions of carbon dioxide,which puts forward higher requirement of the reasonable utilization of coke oven gas(COG).A large number of metallurgical coke powder do not conform to the requirement of the production process,resulting in the irrational utilization of CP(coke powder).Therefore,the CO2 reforming of coke oven gas was carried out over the catalyst in this paper,which used the metallurgical coke powder as the carrier supported Ni.Firstly,it was found that the activity of CP showed better catalytic performance than the blank test.The different catalyst preparation process was also investigated.It was showed that the ZZ-2 synthesized by impregnation before coke-forming has superior catalytic performance than the ZZ-1 those prepared by coke-forming before impregnation.Nevertheless,the mechanical strength of ZZ-2 is significantly lower than the ZZ-1.Existence of HZ in COG showed a remarkable influence to CO2 reforming of COG,that is the existence of H2 made CH4 and CO2 conversion improved while carbon deposition rate reduced.Then,we investigated the influence of the space velocity,the particle size of CP and Ni loading.The results show as follows:Space velocity of 1833 ml·g-1·h-1,particle diameter of 2 mm?3 mm and Ni loading 8%are most favourable to reactant gas conversion.The NiO reduction peak of the catalyst calcinated at the high temperature(800?)moved to the high temperature section combined with H2-TPR characterization methods.High temperature calcination is conducive to the growth of the NiO,while the catalytic activity by high temperature calcination is clearly inferior to the low.The conversion of methane and carbon dioxide is maintained at about 97%after continuous operation at 960? for 6000 minutes.Secondly,the catalytic activity of 120-CP and 180-CP enhanced greatly by studying on modified CP at the different temperature(CP,40-CP,120-CP and 180-CP)by 30%H2O2.The catalysts of modified CP supported 8%Ni were prepared by incipient-wetness impregnation method.The results found that the catalytic activity of 8%Ni/120-CP and 8%Ni/180-CP is slightly increasedFinally,adding metal additives Ce and Ca respectively based on 8%Ni/CP catalysts showed the different catalytic performance.The catalytic performance has achieved remarkable effect by adding 1%Ce;however,the result remained largely unchanged through the addition of 1%Ca.