LaXCoO_3(X=Mg,Ca,Sr,Ce)催化剂的制备及其催化乙醇水蒸气重整制氢  

Preparation of LaXCoO_3(X = Mg, Ca, Sr, Ce) catalysts and their performance for steam reforming of ethanol to hydrogen

作　　者：马飞[1,2] 丁振武[1,3] 储伟[1,3] 郝世雄[1,4] 齐涛[2] 

机构地区：[1]四川大学化工学院,四川成都610065 [2]中国科学院过程工程研究所湿法冶金清洁技术国家工程实验室,北京100190 [3]四川省环境保护环境催化材料工程技术研究中心,四川成都610064 [4]四川理工学院化工系,四川自贡643000

出　　处：《催化学报》2014年第10期1768-1778,共11页

基　　金：国家重点基础研究发展计划(973计划;2011CB201202)~~

摘　　要：以PEG 400为分散剂,采用一步柠檬酸络合法制备了LaXCoO3(X=Mg,Ca,Sr,Ce;La:X=3:2)复合催化剂.采用X射线衍射、红外光谱、扫描电镜、X射线光电子能谱、N2吸附-脱附和H2程序升温还原等技术对复合催化剂进行了表征,考察了不同元素A位取代对LaCoO3钙钛矿结构的影响,进而研究了其对乙醇水蒸气重整制氢的催化性能和稳定性.结果表明,在高含量取代时,只有Ce取代的样品能够保持单一的钙钛矿晶型;Ca或Sr取代的样品产生的Co3O4分离相有利于复合催化剂活性中心钴的还原;Sr或Ce取代的样品在反应中表现出较好的活性和稳定性,Sr取代的样品活性更高.Perovskite nanocomposite catalysts LaXCoO3 （X = Mg, Ca, Sr, or Ce; n（La）：n（X） = 3：2） have been prepared by a citric acid-complexing method and used for steam reforming of ethanol （SRE）, lead-ing to hydrogen generation. The samples were characterized by X-ray diffraction, infrared spec-troscopy, scanning electron microscopy, X-ray photoelectron spectroscopy, N2 adsorp-tion-desorption, and H2 temperature-programmed reduction. The effects of elemental substitution in the LaCoO3 perovskite were studied, and the catalytic performance and primary stability of the hydrogen production from SRE were investigated. In the highly substituted samples, only the Ce-doped sample was isolated as the pure perovskite phase. The presence of a Co3O4 phase in the Ca-doped or Sr-doped samples was beneficial for the reduction of the active Co component, while Sr-doped or Ce-doped samples showed good activity and stability. The sample incorporating Sr demonstrated better catalytic performance than those of other samples.

关 键 词：柠檬酸络合法 钙钛矿 钴 复合催化剂 乙醇水蒸气重整 氢气 

分 类 号：O643.36[理学—物理化学] TQ116.2[理学—化学]