Catalytic performance of MnOx-NiO composite oxide in lean methane combustion at low temperature
Catalytic performance of MnOx-NiO composite oxide in lean methane combustion at low temperature
复制标题
MnOx-NiO复合氧化物对贫甲烷低温燃烧的催化性能
DOI：
10.1016/j.apcatb.2012.09.021
复制
发表时间：
2013-01
影响因子：
22.1
通讯作者：
Wang, Jianguo
中科院分区：
文献类型：
--
作者：
Zhang, Jing;Hu, Ti;ou;Fan, Weibin;Wang, Jianguo
采用共沉淀法制备了一系列MnOx-NiO复合氧化物催化剂，并将其用于甲烷低温催化燃烧。与相应的单一NiO和MnOx氧化物相比，适当组成的MnOx-NiO复合氧化物在贫甲烷氧化中表现出更高的催化性能。XRD和HRTEM结果表明MnOx-NiO以Ni-Mn-O固溶体形式存在。XAFS和XPS结果表明，MnOx-NiO中锰的含量对锰的氧化态和氧化镍的晶体缺陷有显著影响。Mn/（Mn+Ni）原子比为0.13的MnOx-NiO催化剂由于Ni和Mn物种之间的强相互作用而具有丰富的高分散的高价（Mn 4+）和高配位数的锰物种以及一定的镍空位。H2-TPR和O2-TPD结果表明，MnOx-NiO复合氧化物比NiO具有更好的还原性和氧迁移率。所有这些特征表明，NiO和MnO在MnOx-NiO复合氧化物中具有显著的协同作用，这有助于其在贫甲烷燃烧中的高性能。
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 MnOxoxides, 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. H2-TPR and O2-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 MnOxin the MnOx–NiO composite oxide, which contributes to its high performance in the lean methane combustion.
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影响因子：
5.3
作者：
N. Yamazoe;Y. Teraoka
通讯作者：
N. Yamazoe;Y. Teraoka
影响因子：
5.5
作者：
Choudhary, VR;Uphade, BS;Pataskar, SG
通讯作者：
Pataskar, SG
影响因子：
22.1
作者：
Li Xue;Changbin Zhang;Hong He;Y. Teraoka
通讯作者：
Li Xue;Changbin Zhang;Hong He;Y. Teraoka
影响因子：
5.5
作者：
Martin J. Keyser;R. Everson;R. Espinoza
通讯作者：
Martin J. Keyser;R. Everson;R. Espinoza
影响因子：
22.1
作者：
Tang, XF;Li, YG;Shen, WJ
通讯作者：
Shen, WJ