期刊
MATERIALS RESEARCH BULLETIN
卷 111, 期 -, 页码 338-341出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2018.11.023
关键词
Structural; X-ray techniques; Nanoparticles; Intermediate species; Methane oxidation
资金
- National key research and development program [2016YFC0203900, 2016YFC0203902]
- National Natural Science Foundation of China [21703037, 21767029]
- leading project of Fujian Province [2017H0049]
- natural science foundation of Fujian [2018J10691]
MnO2 with nanocubes and nanorods were synthesized by a hydrothermal process, and their structures and catalytic performances in methane combustion were investigated. The activity results show that methane conversion over nanocubic MnO2 is more than 90% at 350 degrees C, which is much higher than that of MnO2 nanorods. N-2 physisorption, XPS and H-2-TPR results demonstrate that the superior catalytic performance of nanocubic MnO2 is associated with its higher BET surface area, smaller crystalline size, more surface oxygen vacancies and better low-temperature reducibility. In situ DRFIFTS results demonstrate that the carboxylates species are the main intermediate species in methane oxidation.
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