多级孔La_(1-x)Sr_xCo_(1-y)Cu_yO_3的软模板法制备、表征及催化活性  

Preparation,Characterization and Catalytic Activity of Hierarchical Porous La_(1-x)Sr_xCo_(1-y)Cu_yO_3

作　　者：金云龙[1] 王丽[1] 王颖[1] 李星[1] 赵少俊[1] 杨文怡[1] Jin Yunlong Wang Li Wang Ying Li Xing Zhao Shaojun Yang Wenyi(Faculty of Material Science and Chemical Engineering, Ningbo University, Ningbo 315211, China)

机构地区：[1]宁波大学材料科学与化学工程学院,浙江宁波315211

出　　处：《中国稀土学报》2017年第3期344-353,共10页Journal of the Chinese Society of Rare Earths

基　　金：浙江省公益技术研究社会发展项目(2016C33024);国家自然科学基金(21607086);宁波市科技惠民项目(2016C51025);宁波市科技计划项目(2014C50037);宁波大学研究生创新基金项目(G16066)资助

摘　　要：分别在以P123为软模板和无P123的条件下制备8个钙钛矿型催化剂La_(1-x)Sr_xCo_(1-y)Cu_yO_3(x=0,0.1;y=0,0.2),用X射线衍射(XRD)、扫描电镜(SEM)、X射线能谱仪(EDS)、BET和X射线光电子能谱(XPS)进行了表征,并测试了它们对CO+NO反应的催化活性。结果表明,以P123为软模板制备的催化剂具有更多大孔径段的介孔和小孔径段的大孔,更大的孔容,更多的氧空位,同时表面La的偏析更少,表面Co的含量以及Co^(3+)/Co^(2+)比例更高。因而,催化剂的催化活性明显优于无模板法制备的催化剂,其中对NO转化率的提升尤为显著。Sr对La的适量取代可以促进CO的氧化反应,而Cu掺杂会降低CO和NO的转化率。Eight perovskite-type catalystsLa1-xSrxCo1-y CuyO3 （x = 0, 0.1 ; y = 0, 0.2） were prepared under the conditions with and without P123 as soft template respectively. They were characterized by X-ray diffraction （ XRD）, scanning electron microscopy （ SEM ）, energy dispersive spectrometry （ EDS ）, Brunauer-emmett-teller （BET） and X-ray photoelectron spectroscopy （XPS）. In addition, the catalytic activity for CO ＋ NO was tested. The results indicated that the Pi23-templated samples had more large mesopores, small macropores and oxygen vacancies, larger pore volume, reduced surface La segregation, increased content of surface Co and ratio of Co^3＋/ Co^2＋ in comparison with the template-free ones. Therefore, the catalytic activity of P123-templated samples is better than that of the template-free ones obviously, especially for NO. An appropriate amount of Sr substitution for La pro-motes the oxidation of CO, whereas copper-doping reduces the catalytic activity for CO ＋ NO.

关 键 词：钙钛矿型催化剂 P123 软模板 催化活性 CO+NO 稀土 

分 类 号：O643.36[理学—物理化学]