期刊
MATERIALS RESEARCH BULLETIN
卷 46, 期 10, 页码 1714-1722出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2011.05.039
关键词
Nanostructures; Oxides; Chemical synthesis; Catalytic properties; Crystal structure
资金
- National Natural Science Foundation of China [20871118]
- National Natural Science Foundation of China-NSAF [10776034]
- Natural Science Foundation of Shandong Province [ZR2009BL013]
- Key Laboratory of Photochemical Conversion and Optoelectronic Materials, TIPC, Chinese Academy of Sciences
Flower-like manganese oxide nanospheres as assembled by layered MnO2 sheets have been successfully fabricated via a facile route using a hydrothermal treatment at 120 degrees C for 12 h. XRD, FE-SEM, TEM and BET were used to investigate the crystalline structure, morphology, specific surface area, and porosity of the products. The products have a BET surface area of ca. 94.6 m(2)/g. Effects of preparation conditions including hydrothermal temperature, reaction time, pH value and kinds of anion were investigated on the morphology, structure and crystalline phase. It was found that control over the morphology and structure of product can be achieved by tuning reaction conditions. On the basis of experimental results, the formation mechanism of the products was investigated and discussed. The manganese oxide nanomaterials showed high catalytic activities for oxidative decomposition of formaldehyde. The crystallographic structure of the products had great influence on the catalytic performance in formaldehyde oxidation. Thereinto, the catalytic activity of the cryptomelane-type MnO2 was higher than other crystalline manganese oxides below 120 degrees C. (C) 2011 Elsevier Ltd. All rights reserved.
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