| 吴藏藏,张海杰,王建,郑丽,徐秀峰.MnxCo2.5-xAl0.5O4尖晶石型三元复合氧化物催化分解N2O[J].分子催化,2016,30(2):131-139 |
| MnxCo2.5-xAl0.5O4尖晶石型三元复合氧化物催化分解N2O |
| Catalytic Decomposition of N2O over MnxCo2.5-xAl0.5O4 Ternary Spinel Oxides |
| 投稿时间：2016-01-30 修订日期：2016-02-28 |
| DOI： |
| 中文关键词: N2O催化分解 尖晶石型三元复合氧化物 MnxCo2.5-xAl0.5O4 溶胶凝胶法 K改性催化剂 |
| 英文关键词:Catalytic decomposition of N2O ternary spinel oxides MnxCo2.5-xAl0.5O4 sol-gel method K-modified catalysts |
| 基金项目:山东省科技发展计划项目(2012GSF11708)，烟台大学研究生科技创新基金项目(GIFYTU). |
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| 中文摘要: |
| 用溶胶凝胶法制备了一组MnxCo2.5-xAl0.5O4尖晶石型三元复合氧化物，用于有氧气氛下的N2O催化分解反应。用N2物理吸附、X射线衍射(XRD)、扫描电镜(SEM)、H2程序升温还原(H2-TPR)、O2程序升温脱附(O2-TPD)、X射线光电子能谱（XPS）等技术对催化剂进行了结构表征，考察了催化剂组成、母液pH、K负载量等制备参数对其催化活性的影响。结果表明：K的加入弱化了催化剂表面的金属-氧化学键，有利于表面氧物种的脱除，使改性催化剂有较高的催化活性和抗水性，其中母液pH=2、K/(Mn Co)之比为0.02的K/Mn0.2Co2.3Al0.5O4催化剂具有较高的催化活性，该催化剂在有氧、有氧有水气氛400C连续反应50h，N2O转化率分别达98.5%和76.5%。 |
| 英文摘要: |
| A series of MnxCo2.5-xAl0.5O4 ternary spinel oxides were prepared by sol-gel method for N2O catalytic decomposition in the presence of oxygen. These catalysts were characterized by means of techniques such as nitrogen physisorption, X-ray diffraction(XRD), scanning electron microscopy(SEM), temperature-programmed reduction of hydrogen(H2-TPR), temperature-programmed desorption of oxygen(O2-TPD), and X-ray photoelectron spectroscopy(XPS). The effect of preparation parameters such as compositions, pH values of mother liquid, and potassium loadings on their catalytic activity in N2O decomposition has been investigated. The results show that K-modified catalysts exhibit better reducibility and higher resistance towards water due to the weakness of surface metal-oxygen bonds in contrast to un-modified catalyst, the K/Mn0.2Co2.3Al0.5O4 prepared using mother liquid of pH=2 and K/(Mn Co) molar ratio of 0.02 is most active. In addition, 98.5% and 76.5% conversions of N2O over 0.02K/Mn0.2Co2.3Al0.5O4 could be maintained after 50h at 400C in atmosphere of oxygen and oxygen-steam together, respectively. |
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