Ni/ZrO_2/Al_2O_3催化剂在CO_2重整CH_4反应中催化性能研究  

Catalytic Performance of Ni/ZrO_2/Al_2O_3 for CO_2 Reforming of Methane

作　　者：李凝[1] 王鹏[1] 王强 

机构地区：[1]桂林工学院材料与化学工程系,广西桂林541004 [2]江西有色测试中心,江西南昌330201

出　　处：《化工技术与开发》2008年第3期1-4,40,共5页Technology & Development of Chemical Industry

基　　金：广西科学基金项目(桂科自0728217)资助

摘　　要：Ni/ZrO2/Al2O3催化剂在二氧化碳重整甲烷反应中,其催化活性和稳定性均优于Ni/ZrO2和Ni/Al2O3催化剂。XRD、TPD、TPR结果表明,在Ni/ZrO2/Al2O3催化剂上能形成较稳定的活性中心,负载型纳米ZrO2/Al2O3复合载体中,ZrO2以四方相形式出现,粒径为5 nm,微波和超声波的作用能诱导ZrO2和Al2O3产生新的碱性中心,有利于二氧化碳的吸附和提高活性组分的分散度。TG-DSC结果表明Ni/ZrO2/Al2O3催化剂上表面炭主要是活性较高的α炭,而Ni/ZrO2和Ni/Al2O3催化剂表面炭主要是活性较低的β炭和γ炭。In the CO2 reforming with methane, the catalytic activity and stability of the Ni/ZrO2/Al2O3 catalyst was better than those of Ni/ZrO2 and Ni/Al2O3. The catalyst was characterized by XRD, TPD and H2-TPR. There was a strong interaction between active phases and the composite supports in the Ni/ZrO2/Al2O3 catalyst. The specific surface of ZrO2/Al2O3 was larger; the particle size of ZrO2 was about 5 nm with tetragonal structure. Microwave could induce alkalescence center and enhanced the interaction between nano-ZrO2 particles and Al2O3. The dispersion of NiO reached to the threshold value and the catalyst displayed a high catalytic activity and better suppressing carbon deposition properties. The surface carbon on the Ni/ZrO2/Al2O3 catalysts was α- carbon with higher activity, while the surface carbons were β and γ-carbon with lower activity on the Ni/ZrO2 and Ni/Al2O3 catalysts.

关 键 词：Ni/ZrO2/Al2O3 CO2 重整CH4 积炭性 

分 类 号：TQ426[化学工程]