流化床中甲烷裂解制氢与催化剂再生过程研究

Process for hydrogen production from methane decomposition in a fluidized bed and catalyst regeneration by air were studied. Two nickel catalysts, 25Ni/CuAl2O3 and 75Ni/CuAl2O3,were used in the process.Methane decomposition and catalyst reactivation reactions were conducted at the same temperature,500℃and 650℃ respectively. Gas volume was controlled in 370mL/min(STP). The results reveal that the catalytic stability of low nickel content catalyst excels that of high nickel content catalyst and its catalytic activity reduces with temperature increasing and operation cycles. But after 5 th operation cycle, methane conversion trends to be a constant value. At same time it is found that switch time affects the methane conversion, i.e. there is an optimal switch time of 5 min. The samples formed after methane decomposition are characterized by XRD and TEM. Finally the results were discussed.