期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 129, 期 -, 页码 172-181出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.apcatb.2012.09.021
关键词
Nickel oxide; Manganese oxide; MnOx-NiO composite oxide; Lean methane; Catalytic combustion
资金
- National Basic Research Program of China [2010CB226900, 2011CB201400]
- National Natural Science Foundation of China [21227002]
- Natural Science Foundation of Shanxi Province of China [2011011006-3, 2012021005-3]
- Chinese Academy of Sciences [KJCX2.YW.H16, YZ200933]
A series of MnOx-NiO composite oxide catalysts were prepared by co-precipitation method and used in the catalytic combustion of lean methane at low temperature. Compared with the corresponding single NiO and MnOx oxides, the MnOx-NiO composite oxide with proper composition exhibits much higher catalytic performance in the lean methane oxidation. XRD and HRTEM results demonstrate that MnOx-NiO is in the form of a Ni-Mn-O solid solution. XAFS and XPS results indicate that the content of manganese in MnOx-NiO has a significant influence on the oxidation state of manganese and the crystal defect of nickel oxide. MnOx-NiO catalyst with an atomic Mn/(Mn + Ni) ratio of 0.13 is provided with abundant highly dispersed manganese species of higher valence (Mn4+) and higher coordination number as well as certain nickel vacancies, due to the strong interaction between Ni and Mn species. H-2-TPR and O-2-TPD results show that the MnOx-NiO composite oxide exhibits better reducibility and oxygen mobility than NiO. All these characterizations suggest a prominent synergism between NiO and MnOx in the MnOx-NiO composite oxide, which contributes to its high performance in the lean methane combustion. (C) 2012 Elsevier B.V. All rights reserved.
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