金属氧化物对霍林河褐煤催化热解行为的影响  

Effect of metal oxides on catalytic pyrolysis of Huolin River lignite

作　　者：廖厚琪 吴华东[1,2] 於暕 张严[1,2] 郭嘉[1,2] 

机构地区：[1]武汉工程大学化工与制药学院,湖北武汉430073 [2]武汉工程大学绿色化工过程教育部重点实验室,湖北武汉430073

出　　处：《武汉科技大学学报》2016年第2期102-106,共5页Journal of Wuhan University of Science and Technology

基　　金：国家自然科学基金资助项目(51346005);湖北省自然科学基金资助项目(2014CFA090)

摘　　要：选用4种金属氧化物(CaO、Al2O3、Fe2O3、NiO)作为催化剂对霍林河褐煤进行热解,利用热重分析技术和动力学模型对褐煤热解行为进行分析,研究不同金属氧化物对褐煤热解催化效果的影响。结果表明,4种金属氧化物催化剂的加入均能有效提高褐煤热解的转化率,其对褐煤热解转化率的促进作用顺序为:NiO>CaO>Fe2O3>Al2O3;在褐煤整个热解过程中,CaO、Fe2O3及NiO均表现出良好的催化作用,而Al2O3仅在热缩聚阶段有一定的催化效果;褐煤在活泼热解阶段和热缩聚阶段的热解过程分别可用一级单一反应模型和二级单一反应模型进行描述,4种金属氧化物在活泼热解阶段对褐煤的催化效果为:NiO>Fe2O3>CaO>Al2O3,在热缩聚阶段对褐煤的催化效果为:Fe2O3>CaO>NiO>Al2O3。Four metal oxides (CaO,Al2 O3 ,Fe2 O3 and NiO)were selected as catalysts for the pyrolysis of Huolin River lignite.The pyrolysis behaviors of the lignite were analyzed by thermogravimetric a-nalysis technique and kinetic model.The effects of different metal oxides on the catalytic pyrolysis be-haviors of the lignite were investigated.The results show that the addition of any of these metal oxide catalysts can effectively improve conversion rate of the lignite pyrolysis,and their effects on the con-version rate of the lignite pyrolysis are NiO>CaO>Fe2 O3>Al2 O3 .CaO,Fe2 O3 and NiO have pro-motion effects for the whole pyrolysis process of the lignite,whilst Al2 O3 only shows a certain cata-lytic effect during the thermal condensation stage.The pyrolysis process during the active pyrolysis and thermal condensation stage can be described by the first-order reaction and second-order reaction model,respectively.The catalytic effect order of four metal oxides on the lignite pyrolysis during the active pyrolysis stage is NiO>Fe2 O3 >CaO>Al2 O3 ,while that during the thermal condensation stage is Fe2 O3>CaO>NiO>Al2 O3 .

关 键 词：褐煤 催化热解 热重分析 动力学 金属氧化物 催化剂 

分 类 号：TQ530.2[化学工程—煤化学工程]