N<sub>2</sub>O在Mg-Fe复合氧化物上的催化分解

王建; 冯鸣; 张海杰; 徐秀峰

N₂O在Mg-Fe复合氧化物上的催化分解

烟台大学应用催化研究所, 山东烟台 264005

基金项目: Supported by the Research Project from Department of Science and Technology of Shandong Province (2012GSF11708)

详细信息

中图分类号: O643
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出版历程
- 收稿日期: 2014-08-15
- 修回日期: 2014-10-30
- 刊出日期: 2014-12-30

Catalytic decomposition of N₂O over Mg-Fe mixed oxides

Institute of Applied Catalysis, Yantai University, Yantai 264005, China

摘要

摘要: 用共沉淀法制备了一组Mg-Fe复合氧化物催化剂,用于N₂O催化分解,考察了催化剂组成、焙烧温度、负载助剂钾等参数对其催化活性的影响。采用N₂物理吸附、X射线衍射、H₂-程序升温还原等技术对催化剂进行了结构表征。结果表明,500 ℃焙烧的Mg_0.6Fe_0.4Fe₂O₄催化剂对于N₂O分解反应有较高活性,而K改性的催化剂活性均有所降低,且K的负载量越高,改性催化剂的活性越低,这是由于负载的K粒子抑制了表面铁物种的还原,降低了催化剂的比表面积。在有氧无水、水氧共存条件下连续反应10 h,Mg_0.6Fe_0.4Fe₂O₄的催化活性和稳定性均显著高于FeO_x催化剂。
- N₂O催化分解 /
- Mg-Fe复合氧化物 /
- K改性 /
- Mg_xFe_1-xFe₂O₄ /
- 催化活性
Abstract: A series of Mg_xFe_1-xFe₂O₄ spinel oxides were prepared and characterized by means of nitrogen physisorption, X-ray diffraction (XRD) and temperature-programmed reduction of hydrogen (H₂-TPR). The effect of composition, calcination temperature, and potassium doping on the catalytic activity of the Mg-Fe mixed oxides in N₂O decomposition was investigated. The results indicated that the Mg_0.6Fe_0.4Fe₂O₄ catalyst calcined at 500 ℃ exhibits highest activity in N₂O decomposition. Unexpectedly, the catalyst activity is depressed by the addition of potassium, as the potassium doping may inhibit the reduction of surface iron oxides and reduce the surface area of K-modified catalysts. Long-term tests at 500 ℃ for 10 h also illustrate that Mg_0.6Fe_0.4Fe₂O₄ is superior to FeO_x catalyst either in the oxygen-alone or in the oxygen-steam concomitant atmosphere.
- N₂O decomposition /
- Mg-Fe mixed oxides /
- K doping /
- Mg_xFe_1-xFe₂O₄ /
- catalytic activity

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参考文献(14)

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