Supported and unsupported manganese oxides for catalytic ammonia combustion
Supported and unsupported manganese oxides for catalytic ammonia combustion
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DOI：
10.1016/j.catcom.2017.11.009
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发表时间：
2018-02-01
影响因子：
3.7
通讯作者：
Machida, Masato
中科院分区：
文献类型：
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作者：
Hinokuma, Satoshi;Shimanoe, Hiroki;Machida, Masato
我们研究了有载体和无载体的锰氧化物（MnOx）与氨（一种无碳能源）的催化燃烧性能。具有较高氧化态的无载体MnOx往往表现出较高的氨催化燃烧活性（MnO₂＞Mn₂O₃＞MnO）。X射线衍射（XRD）和吸收精细结构（XAFS）分析表明，燃烧反应后MnO₂还原为Mn₂O₃。在负载于各种材料上的MnOx（5 wt% Mn）中，MnOx/CeO₂表现出最高的活性。对反应前后的X射线光电子能谱（XPS）分析表明，CeO₂负载的MnOx的氧化态是Mn²⁺和Mn³⁺的混合物。
We study the catalytic combustion properties of supported and unsupported manganese oxides (MnOx) with NH3 (a carbon-free energy source). Unsupported MnOx with higher oxidation states tends to exhibit higher catalytic NH3 combustion activity (MnO2 > Mn2O3 > MnO). X-ray diffractometry (XRD) and absorption fine structure (XAFS) analysis show that MnO2 reduces to Mn2O3 after the combustion reaction. Among the MnOx (5 wt% Mn) supported on various materials, MnOx/CeO2 exhibited the highest activity. Analysis of XPS (X-ray photoelectron spectroscopy) spectra before and after the reaction suggests that the oxidation state of CeO2-supported MnOx is a mixture of Mn2+ and Mn3+.