文献类型：会议论文

英文题名：Easy precipitation method for preparation of cerium added La2O2SO4 used for oxygen storage

作者：Shen, Weihua[1];Naito, Shuichi[2]

机构：[1]E China Univ Sci & Technol, Sch Chem Engn, 130 Meilong Rd, Shanghai 200237, Peoples R China;[2]Kanagawa Univ, Dept Mat & Life Chem, Kanagawa Ku, Yokohama, Kanagawa 2218686, Japan

会议论文集：3rd International Conference on Material Science, Environment Science and Computer Science (MSESCS 2014)

会议日期：JAN 11-12, 2014

会议地点：Wuhan, PEOPLES R CHINA

语种：英文

外文关键词：lanthanum oxysulfate/oxysulfide; Ce; Oxygen storage; Precipitation; Palladium

摘要：The present work gives a simple precipitation method for preparation of lanthanum oxysulfate and cerium modified lanthanum oxysulfate by using lanthanum nitrate and ammonium sulfate as precursor in the presence of ammonia. The XRD, TEM, XPS, and N-2 sorption measurements have been adopted to characterize those materials. The present work demonstrates that cerium addition can promote the oxidation and reduction process between lanthanum oxysulfide(La2O2S) and lanthanum oxysulfate (La2O2SO4). The cerium doped La2O2SO4/La2O2S oxygen storage system showed the replacement of cerium for some La site to form a stable structure and no sulfur leakage took place in the process of redox cycle. The oxidation temperatures of La2O2S to La2O2SO4 decrease more than 150 degrees C for cerium doping samples; and the reduction temperature of La2O2SO4 to La2O2S in hydrogen decreases about 50 degrees C. The redox cycle between Ce3+ and Ce4+ has been considered response to the promotion of the redox cycle.