| N2O decomposition over K/Na-promoted Mg/Zn-Ce-cobalt mixed oxides catalysts |
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| 作者姓名： | Jinli Zhang Hui Hu Jie Xu Gaoming Wu Zhaowei Zeng |
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| 作者单位： | School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Shanghai LongKing Environmental Protection Co., Ltd., Shanghai 200331, China;Wuhan Iron and Steel (Group) Corp., Wuhan 430083, China;School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| 基金项目： | This work was supported by the Hi-Tech Research and Development Program (863) of China (No. 2012AA062501), the Natural Science Foundation of Hubei Province (No. 2009CDB246) and the Postgraduates Innovation Foundation of Huazhong University of Science and Technology of China (No. HF-08-11-2011-261). |
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| 摘 要： | Three groups of cobalt mixed oxide catalysts（Mg/Zn-Co, Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-Co）were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on cobalt mixed catalysts for nitrous oxide（N2O）decomposing to N2 and O2were investigated. The experimental results revealed that the catalytic activity for N2 O decomposition was promoted as Co2＋was replaced partially by Zn2＋/Mg2＋, moreover, the characterization analysis by XRD and XPS showed that Zn2＋/Mg2＋replaced Co2＋successfully into the spinel structure of Co3O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around Co and an improvement of the catalytic activity. Of the investigated cobalt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-Co catalyst.
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| 关 键 词： | 复合氧化物催化剂 四氧化三钴 N2O分解 氧化铈 锌 镁 混合催化剂 催化活性 |
| 收稿时间： | 22 May 2013 |
| 修稿时间： | 14 November 2013 |
N2O decomposition over K/Na-promoted Mg/Zn-Ce-cobalt mixed oxides catalysts |
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| Jinli Zhang,Hui Hu,Jie Xu,Gaoming Wu,Zhaowei Zeng.N2O decomposition over K/Na-promoted Mg/Zn-Ce-cobalt mixed oxides catalysts[J].Journal of Environmental Sciences,2014,26(7):1437-1444. |
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| Authors: | Jinli Zhang Hui Hu Jie Xu Gaoming Wu and Zhaowei Zeng |
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| Institution: | School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China;Shanghai LongKing Environmental Protection Co., Ltd., Shanghai 200331, China;Wuhan Iron and Steel (Group) Corp., Wuhan 430083, China;School of Environmental Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China |
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| Abstract: | Three groups of cobalt mixed oxide catalysts (Mg/Zn-Co, Mg/Zn-Ce-C, K/Na-Mg/Zn-Ce-Co) were prepared by sol-gel or impregnation methods. The synergistic effects of transition metal, rare earth metal and alkali metal on cobalt mixed catalysts for nitrous oxide (N2O) decomposing to N2 and O2 were investigated. The experimental results revealed that the catalytic activity for N2O decomposition was promoted as Co2+ was replaced partially by Zn2+/Mg2+, moreover, the characterization analysis by XRD and XPS showed that Zn2+/Mg2+ replaced Co2+ successfully into the spinel structure of Co3O4 and promoted significantly the catalytic activity. Especially, the addition of CeO2 and K2O/Na2O decreased the binding energy and resulted in an increase in the density of the electron cloud around Co and an improvement of the catalytic activity. Of the investigated cobalt mixed catalysts, the best catalytic activity was shown by 2% K-Zn0.5-Ce0.05-Co catalyst. |
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| Keywords: | N2O Catalytic decomposition CeO2 Alkali metal |
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