铈锆固溶体的制备及其负载金催化剂的CO氧化性能  

Preparation of ceria-zirconia solid solution and CO oxidation performance of Au/Ce_xZr_(1-x)O_2 catalyst

作　　者：聂晓涛[1,2] 葛庆杰[1] 马现刚[1] 李卫力[1,2] 徐恒泳[1] 

机构地区：[1]中国科学院大连化学物理研究所洁净能源国家实验室,辽宁大连116023 [2]中国科学院大学,北京100049

出　　处：《天然气化工—C1化学与化工》2013年第3期6-11,共6页Natural Gas Chemical Industry

摘　　要：以共沉淀法制备的不同铈锆原子比的CexZr1-xO2为载体,采用直接阴离子交换法(DAE)制备了Au/CexZr1-xO2催化剂。通过X射线衍射、N2物理吸附和H2程序升温还原等技术分别对载体和催化剂进行了表征,同时评价了Au/CexZr1-xO2催化剂的CO氧化活性。结果表明,以硝酸铈铵为前驱体可制备单相铈锆固溶体,Zr的加入提高了CeO2的比表面积,改善了其孔结构。负载Au有利于促进铈锆固溶体的还原。在Au/CexZr1-xO2系列催化剂中,Au/Ce0.75Zr0.25O2催化剂表现出最佳的CO氧化性能。A series of CexZr1-xO2 composite oxide supports were prepared by co-precipitation method and their corresponding Au/ CexZr1-xO2 catalysts were prepared by direct anionic exchange（DAE） method.The supports and catalysts were characterized by XRD,N2 physisorption and H2-TPR,and the CO oxidation activity of the catalysts were measured in a fixed bed reactor.Results showed that single phase ceria-zirconia solid solution could be prepared using cerium（Ⅳ） ammonium nitrate as precursor.Addition of Zr increased the specific surface area of CeO2 and changed the pore structure of the support.Loading of Au was beneficial to the reduction of ceria-zirconia solid solution,thus facilitated CO oxidation on Au/CexZr1-xO2.Au/Ce0.75Zr0.25O2 exhibited the best CO oxidation activity among Au/CexZr1-xO2 catalysts.

关 键 词：硝酸铈铵 前驱体 铈锆固溶体 直接阴离子交换法 金催化剂 一氧化碳 氧化 

分 类 号：O643[理学—物理化学]