【作者】 李丽娜；

【导师】 龚茂初；

【作者基本信息】 四川大学 ， 物理化学， 2003， 硕士

【摘要】 本论文主要研究了以Fe₂O₃为活性组分，以不同的氧离子传导材料和储氧材料为载体的整体式燃烧催化剂在甲烷催化燃烧中的催化性能。并且讨论了不同的反应条件对两种类型的催化剂催化活性的影响。通过XPS、TPR等技术研究造成催化剂活性不同的原因以及经过高温老化以后失活的机理。 研究结果表明，在以Fe₂O₃为活性组分具有氧离子传导功能的YSZ-Al₂O₃为载体制备的催化剂在老化前后催化活性的顺序为Fe₂O₃／YSZ-Al₂O₃＞Fe₂O₃／ZrO₂-Al₂O₃＞Fe₂O₃／γ-Al₂O₃。说明ZrO₂和Y₂O₃的加入能够增强催化剂的催化活性以及抗老化的性能。XPS结果表明ZrO₂和Y₂O₃的同时添加能增加和稳定Fe₂O₃的表面浓度，从而导致催化剂的高活性和高稳定性。 Fe₂O₃为活性组分，以储氧材料CeO₂-ZrO₂作载体，制得Fe₂O₃／CeO₂-ZrO₂催化剂。在载体中添加E和M。结果表明将E和M同时加入载体中，比载体中单独加E和单独加M的催化剂活性有明显提高。E的加入可以减弱M与Fe₂O₃的相互作用，减少了FeMO₂的生成。M多种价态的转变成为提高催化剂活性的关键因素。 对于以氧离子传导材料和储氧材料为载体的两种甲烷燃烧催化剂，在一定的反应条件下具有有最佳的催化效果：空速为6000h^-1，反应气的烷氧比为1：4，稀释气含量为60％。更多还原

【Abstract】 Fe2O3 is used as active compound in monolith catalyst for the combustion of methane. Two kinds of catalytic supports (oxygen ion conduction material and oxygen storage material) have been studied. Different reaction factors greatly affect the catalytic activity. The results of XPS and TPR have revealed the reasons for different activity of fresh and aged catalysts.Catalysts for methane combustion are prepared by Fe2O3 supported on r-Al2O3,ZrO2-Al2O3,YSZ( Yttria stabilize Zirconia) -A12O3, respectively. Among the three kinds of catalysts Fe2O3 /YSZ-Al2O3 has showed the highest activity and best thermal stability. The XPS result demonstrats that the addition of ZrO2 and Y2O3 can increase and stabilize the surface concentration of Fe2O3 and decrease the interaction between iron species and r-Al2O3 support.Oxygen storage material (CeO2-ZrO2) is used as support. It is doped with E and M. The catalytic activity of addition of E and M in support together is better than addition the tow elements respectively. Addition of E can decrease the interaction of M and Fe2O3. The different valence of M is the key factor of improving catalytic activity.These two kinds of methane combustion catalysts show the best active at following reaction factors. Space velocity is 60, 000h-1. Ration of CH4 and O2 is 1:4. Quantity of balance gas(N2) is 60%.更多还原