Tuning surface active oxygen of lanthanum oxide via partial dissolution and regrowth of crystallites

作     者：Zhiming Gao, Huili Li Key Laboratory of Cluster Science, Ministry of Education of China Department of Chemistry, School of Science, Beijing Institute of Technology, Beijing 100081, China 

作者机构：Key Laboratory of Cluster Science Ministry of Education of China Department of Chemistry School of Science Beijing Institute of Technology Beijing 100081 China 

出 版 物：《Journal of Natural Gas Chemistry》 (天然气化学杂志（英文版）)

年 卷 期：2011年第20卷第5期

页      面：483-486页

核心收录：

学科分类：0808[工学-电气工程] 081704[工学-应用化学] 07[理学] 0817[工学-化学工程与技术] 08[工学] 0807[工学-动力工程及工程热物理] 0703[理学-化学] 070301[理学-无机化学] 

主　　题：solid state reaction surface oxygen crystallite regrowth TPR metal oxide 

摘      要：A commercial lanthanum oxide was modified into X%-La2O3 samples via partial dissolution and regrowth of crystallites, wherein the X value denotes the weight percent of the initial metal oxide powder dissolved by nitric acid. BET measurements and TEM observations indicate that the 20%-La2O3 sample has an increased specific surface area, relatively thin and small crystallites in size. TPD/TPR profiles also show that the 20%-La2O3 sample has more surface active oxygen than the 0%-La2O3 sample. Among the four X%-La2O3 samples, the highest activity for methane oxidation was obtained over the 20%-La2O3 sample. Therefore, the present work proves that the method of partial dissolution and regrowth of crystallites are effective to modify surface property of lanthanum oxide.