溶胶-凝胶法制备NixCo1-xCoAlO4尖晶石型复合氧化物及其催化分解N2O性能

张海杰; 王建; 徐秀峰

溶胶-凝胶法制备Ni_xCo_1-xCoAlO₄尖晶石型复合氧化物及其催化分解N₂O性能

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: 2014-09-18
- 修回日期: 2014-11-05
- 刊出日期: 2015-01-30

Catalytic decomposition of N₂O over Ni_xCo_1-xCoAlO₄ spinel oxides prepared by sol-gel method

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

Funds: Supported by the Research Project from Department of Science and Technology of Shandong Province (2012GSF11708).

摘要

摘要: 用溶胶凝胶法制备了一组Ni_xCo_1-xCoAlO₄尖晶石型复合氧化物,并采用表面润湿浸渍K₂CO₃溶液进行了K掺杂改性,用于有氧气氛下的N₂O催化分解反应.采用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)等技术对催化剂进行了表征,考察了催化剂组成、母液pH值、K负载量等制备参数对其催化活性的影响.结果表明,母液pH值为3、K/(Ni+Co)物质的量比为0.1的K/Ni_0.15Co_0.85CoAlO₄催化剂具有较高的N₂O分解活性,450 ℃ N₂O可完全分解.助剂K的加入弱化了催化剂表面金属氧键,提高了催化剂的还原性、催化活性和抗水性.
- N₂O分解 /
- Ni_xCo_1-xCoAlO₄ /
- 溶胶-凝胶法 /
- 尖晶石型复合氧化物 /
- 钾改性
Abstract: Ni_xCo_1-xCoAlO₄ spinel oxides with different compositions were prepared by sol-gel method and further modified with K₂CO₃ by incipient impregnation. The Ni_xCo_1-xCoAlO₄ spinel oxides were characterized by means of nitrogen physisorption, X-ray diffraction (XRD), scanning electron microscopy (SEM), and temperature-programmed reduction by hydrogen (H₂-TPR); the effect of preparation parameters such as composition, mother liquid pH value, and potassium loading on their catalytic activity in N₂O decomposition was investigated. The results show that the K/Ni_0.15Co_0.85CoAlO₄ catalyst prepared with a pH value of 3 and a K/(Ni+Co) molar ratio of 0.1 is most active for N₂O decomposition; over it, N₂O can be completely decomposed into nitrogen and oxygen at 450 ℃ in the presence of oxygen. K-modified catalysts exhibit high catalytic activity, good reducibility and resistance towards water, as K species may be able to weaken the surface metal-oxygen bonds.
- N₂O decomposition /
- Ni_xCo_1-xCoAlO₄ /
- sol-gel method /
- spinel oxide /
- K modification

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参考文献(16)

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