制备方法对NiCoPrLa类水滑石及其衍生复合氧化物结构及催化性能的影响  

Influence of Different Synthetic Methods on the Structure and Catalytic Properties of Hydrotalcite-like Compounds and their Derived Mixed Oxides

作　　者：彭楠楠[1] 李凝[1] 邓明海[1] 韦立宁[1] 蒋武[1] 

机构地区：[1]桂林理工大学化学与生物工程学院,广西桂林541004

出　　处：《分子催化》2012年第5期414-422,共9页Journal of Molecular Catalysis(China)

基　　金：国家自然科学基金项目(21166006);广西科技开发项目(桂科攻11107021-1-5)

摘　　要：用微波法,水热法和微波水热法合成NiCoPrLa类水滑石,并用XRD,TG,TPO,TPR,TPD和FT-IR等对NiCoPrLa类水滑石的晶相结构、热稳定性及相应的衍生复合氧化物的晶相结构、还原性能、吸附性能和抗积碳性能等进行了表征,同时以乙醇水蒸气重整制氢为探针反应考察了制备方法对NiCoPrLa类水滑石的衍生复合氧化物的初活性和选择性的影响.结果表明,制备方法影响类水滑石的结构和热稳定性,水热法制备的类水滑石结晶度较好,微波水热法制备的类水滑石具有较好热稳定性,其中微波水热法所制备的类水滑石衍生复合氧化物具有较好的催化活性和抗积炭性能,在350℃温度下乙醇转化率达到86%.NiCoPrLa hydrotalcites were synthesized by microwave、 microwave-hydrothermal and hydrothermal treatment.In order to study the crystalline phase and thermal stability of the hydrotalcite-like compounds and the crystalline phase、 reducibility、 adsorptive property and carbon deposition resisting property of the derived mixed oxides,the obtained samples were characterized by XRD,TG,TPO,TPR,TPD and FT-IR.At the meantime,the ethanol steam reforming was taken as the proble reaction to investigate the initial activity and the selectivity of mixed oxides derived from NiCoPrLa hydrotalcite-like compounds prepared by different methods.The results showed that the structure and thermal stability of the hydrotalcite were influenced by preparation methods.The hydrothermal method could synthesis hydrotalcite with good crystallinity,microwave-hydrothermal method could improve the thermal stability of the hydrotalcite-like compounds,the catalyst synthesized by microwave-hydrothermal method had a better catalytic performance and carbon deposition resisting property,and the ethanol conversion of the catalyst achieved 86% at 350 ℃.

关 键 词：制备方法 类水滑石 衍生复合氧化物 

分 类 号：O643.32[理学—物理化学]