Three-dimensionally ordered macroporous LaMnO3 with tunable oxygen vacancies via nitric acid-aided modulating and their catalytic combustion properties

• Published in: RSC advances Vol. 5; no. 119; pp. 9844 - 98411
• Main Authors: Yang, Renchun, Lu, Xiaojia, Zhang, Zhihua, Wang, Xiuxiang, Tang, Dingxing, Zhu, Lingting
• Format: Journal Article
• Language: English
• Published: 01.01.2015
• Subjects: Catalysis; Catalysts; Combustion; Nitric acid; Oxidation; Oxides; Oxygen; Vacancies
• ISSN: 2046-2069
• DOI: 10.1039/c5ra19561f

Three-dimensionally ordered macroporous (3DOM) LaMnO 3 oxides with tunable oxygen vacancies have been successfully fabricated via a facile nitric acid-aided modulating sol-gel method. The morphology, composition, pore structure and reducibility of the prepared catalysts were characterized by XRD, EDS, FE-SEM, XPS, TPR, and N 2 adsorption-desorption. The results indicate that the oxygen vacancies contents of the as-prepared catalysts are heavily dependent on the amount of nitric acid. Among the three LaMnO 3 catalysts, the LaMnO 3 -C sample shows the highest oxygen vacancies content and the better low-temperature reducibility. These findings reveal that the introduction of a little amount of nitric acid can effectively promote the formation of oxygen vacancies, ultimately resulting in an enhanced catalytic oxidation activity for ethyl acetate oxidation. Three-dimensionally ordered macroporous (3DOM) LaMnO 3 oxides with tunable oxygen vacancies have been successfully fabricated via a facile nitric acid-aided modulating sol-gel method.