【摘要】 对流化床中甲烷裂解制氢与催化剂再生过程进行了研究。选用25N i/Cu-A l2O3和75N i/Cu-A l2O3两种催化剂,分别在500℃和650℃进行甲烷裂解制氢与催化剂再生,反应与再生过程的温度与时间保持相同,催化剂再生时采用空气进行再生,气体流量均为370 mL/m in(STP)。实验结果表明,镍质量分数较低时催化剂表现出较好的稳定性,温度增加催化剂的稳定性降低。甲烷转化率随操作周期呈下降趋势,在500℃制氢与再生操作达到第五周期时,甲烷转化率趋于稳定。对切换时间的影响研究表明,切换时间存在一个最佳值,即切换5 m in时甲烷裂解制氢效率最高。对生成碳产品进行了XRD和TEM表征,并对实验结果进行了讨论。更多还原

【Abstract】 Process for hydrogen production from methane decomposition in a fluidized bed and catalyst regeneration by air were studied.Two nickel catalysts,25Ni/Cu-Al₂O₃ and 75Ni/Cu-Al₂O₃,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 370mL/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.更多还原