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| Reforming of methane with carbon dioxide and oxygen was investigated over Ni/MgO-SiO2 catalysts using fixed bed and fluidized bed reactors. The conversions of CH4 and CO2 in a fluidized bed reactor were close to thermodynamic equilibrium, the activity and stability of catalyst in the fixed bed reactor was lower than that in the fluidized bed reactor due to carbon deposition and nickel sintering. TGA and TEM techniques were used to characterize spent catalysts, results showed that a lot of whisker carbon was found on catalyst in the rear of the fixed bed reactor, and no deposited carbon was observed on catalysts in the fluidized bed reactor after reaction. It is suggested that this phenomenon is relate to a permanent circulation of catalyst particle between the oxygen-rich and oxygen-free zones. That is, fluidization of catalysts in fluidized bed reactor favors to inhibiting deposited carbon and a thermal uniformity in the reactor. |
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| Keywords:Methane reforming, Ni/MgO-SiO2, fluidized bed reactor, syngas |
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