稀土烧绿石型催化剂上CO_2重整CH_4制合成气反应研究  

Pyrochlore-Type Lanthanum Zirconium Composite Oxide Catalysis Reaction of CO_2 Reforming of Methane to Synthesis Gas

作　　者：孟和[1] 胡瑞生[1] 张晓菲[1] 逯高清[2] 苏海全[1] 

机构地区：[1]内蒙古大学化学化工学院稀土材料化学与物理重点实验室,内蒙古呼和浩特010021 [2]澳大利亚昆士兰大学纳米材料研究中心

出　　处：《中国稀土学报》2006年第z2期62-67,共6页Journal of the Chinese Society of Rare Earths

基　　金：国家教育部春晖计划资助项目(Z2004-2-15028);内蒙自然科学基金资助项目(200408020203)

摘　　要：通过溶胶-凝胶法合成了La-Zr-O和Ni-La-Zr-O体系催化剂,采用XRD,BET和TPR技术对其物理化学性质进行了表征,以CO2重整CH4制合成气反应为探针反应对其重整活性进行了研究。结果表明,在空气中1100℃焙烧后,La-Zr-O体系催化剂形成了单相烧绿石结构复合氧化物,对CO2重整CH4制合成气反应表现出了优良的抗积炭能力,而以镍修饰后XRD方法只测量到了单相烧绿石结构La2Zr2O7衍射峰,说明NiO很有可能以无定形的细小晶粒均匀分散在La2Zr2O7表面。值得指出的是镍修饰后的烧绿石型催化剂对CO2重整CH4制合成气反应表现出了更加优良的催化活性,同时具有一定的抗积炭能力,优于相同方法制备的Ni-ZrO2和Ni-La2O3催化剂。La-Zr-O and Ni-Zr-O catalysts were prepared by sol-gel method and characterized by XRD,BET,TPR and catalytic activities for the reaction of CO_2 reforming of methane to synthesis gas.The results show that well-defined La_2Zr_2O_7 powders with a single-phase pyrochlore structure can be obtained at 1100 ℃ for 3 h in air and behave excellent resistance to carbon deposition for the reaction of CO_2 reforming of methane.The Ni modified Ni-La_2Zr_2O_7 catalyst obtained single-phase pyrochlore structure La_2Zr_2O_7 diffraction peaks,which proves that NiO may disperse in the surface of La_2Zr_2O_7 with the form of small amorphous crystal particles.The Ni modified Ni-La_2Zr_2O_7 catalyst shows better catalytic activity on reaction of CO_2 reforming of methane to synthesis gas at high temperature and resistance to carbon deposition than that of the Ni-ZrO_2 and Ni-La_2O_3 catalysts prepared by the same method.

关 键 词：烧绿石 甲烷重整 溶胶-凝胶法 合成气 稀土 

分 类 号：TQ426.82[化学工程]