Tuning surface active oxygen of lanthanum oxide via partial dissolution and regrowth of crystallites |
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Authors: | Zhiming Gao Huili Li |
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Affiliation: | Key Laboratory of Cluster Science, Ministry of Education of China; Department of Chemistry, School of Science, Beijing Institute of Technology, Beijing 100081, China |
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Abstract: | 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. |
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Keywords: | solid state reaction surface oxygen crystallite regrowth TPR metal oxide |
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