摘要
采用水热合成法制备不同NiO含量的Ni Zr0 4 Ce0 6 O2 Al2 O3催化剂 ,使用X射线衍射 (XRD)和H2 的程序升温还原 (H2 TPR)对样品进行表征 ,研究了NiO的含量对催化剂结构和CH4 CO2 重整性能的影响。结构表征表明 ,少量Ni组分能在催化剂表面分散并进入CeO2 ZrO2 固熔体晶格间隙而被固熔体包裹 ,并使固熔体晶粒变小 ,促进了固熔体的低温还原 ,而过量的NiO暴露在外生成NiO颗粒。活性测试结果表明 ,NiO含量少的样品活性随反应进行有较高的增长。选择适当空速 ,能使CH4 CO2 以 1∶1反应。
Ni/Zr 0 4 Ce 0 6 O 2 Al 2O 3 catalyst samples with different amount of NiO were prepared by hydrothermal method and characterized by X ray diffraction and H 2 temperature programmed reduce techniques The influence of addition of NiO on structures of catalysts and activity of CO 2 reforming of methane were studied It is found that a small amount of NiO can disperse on surface and enter the crystal lattice space of solid solution and be enwrapped by CeO 2 ZrO 2 solid solution, consequently restricts the growth of CeO 2 ZrO 2 solid solution grain and promote reducibility of solid solution at low temperature, whereas excess amount of NiO exposes outside and forms crystallites of NiO A obvious increasing of activity over catalyst with lesser amount NiO is found At a certain space velocity the conversion of CH 4 and CO 2 at same molar ratio can been obtained
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2002年第5期468-472,共5页
Journal of Fuel Chemistry and Technology
