尖晶石型Co_(0.7)Ce_(0.3)Co_2O_4催化剂的制备及其甲烷催化燃烧性能的研究  

Preparation of Spinel Type Co_(0.7)Ce_(0.3)Co_2O_4 Catalysts and Their Catalytic Performances in Methane Combustion

作　　者：丁佳[1] 罗来涛[1] 

机构地区：[1]南昌大学应用化学研究所,江西南昌330031

出　　处：《稀有金属》2009年第3期386-390,共5页Chinese Journal of Rare Metals

基　　金：高等学校博士学科点专项研究基金(20040403001);江西教育厅科研基金(2005035)资助项目

摘　　要：采用共沉淀法、溶胶凝胶法和溶液燃烧法制备了一系列Co_(0.7)Ce_(0.3)Co_2O_4催化剂,研究了制备方法对催化剂甲烷催化燃烧反应性能的影响,并运用XRD、BET和TPR等技术对催化剂进行了表征。结果表明,共沉淀法制备的Co_(0.7)Ce_(0.3)Co_2O_4催化剂有较好的催化活性和热稳定性,与溶胶凝胶法和溶液燃烧法制备的Co_(0.7)Ce_(0.3)Co_2O_4催化剂相比,共沉淀法制备的Co_(0.7)Ce_(0.3)Co_2O_4催化剂有较高的晶格畸变率和比表面积、较大的孔径和孔容、较小的晶粒度、较强的氧活动性和较低的甲烷催化燃烧反应的表观活化能。A. series of Co0. 7 Ce0.3 Co2O4 catalysts were prepared by the co-precipitation, sol-gel and solution combustion methods. The influence of preparation method of the catalysts on catalytic combustion of methane was studied： These samples were investigated by using the XRD, BET and TPR techniques. The results indicated that the catalytic activity and thermal stability of Co0. 7 Ce0.3 Co2O4 catalyst prepared by coprecipitation method were the best among all catalysts samples, which could be explained in terms of its higher lattice distortion and surface area, larger pore diameter and pore volume, smaller crystal size, stronger oxygen mobility and lower apparent activation energy of catalytic combustion of methane.

关 键 词：制备方法 尖晶石结构 钴 复合氧化物 甲烷催化燃烧 

分 类 号：O643.32[理学—物理化学]