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OALib Journal期刊
ISSN: 2333-9721
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cu/co/mn基氧载体释氧动力学及机理研究
, PP. 235-242
Keywords: 动力学机理,活化能,化学链氧解耦,富氧燃烧,氧载体
Abstract:
？以溶胶凝胶法制备了cuo/cual2o4、co3o4/coal2o4以及mn2o3/al2o3氧载体,在流化床反应器中co2气氛下研究了不同温度下氧载体释氧特性,并通过分析得到各氧载体的释氧动力学机理函数、活化能及指前因子等重要参数。释氧过程中,氧载体cuo/cual2o4中cuo、cual2o4均为活性相,释氧后转化为cu2o及cualo2,而co3o4/coal2o4及mn2o3/al2o3中coal2o4和al2o3均为惰性相,仅有co3o4和mn2o3参与释氧并分别转化为coo和mn3o4。三种氧载体的释氧过程均可由成核-核生长机理描述,释氧初期氧载体经化学反应形成新的活性核心,随后活性核心聚集形成还原态的氧载体团簇。各氧载体释氧的机理函数g(x)有不同的表达式,cuo/cual2o4、co3o4/coal2o4、mn2o3/al2o3释氧的活化能e分别为226.37、130.06和65.90kj/mol,相对应的指前因子a分别为2.99×106、4.96×103和27.37s-1。
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