环境化学
明彩兵,叶代启,梁红,刘晖.过渡金属-铈复合氧化物对碳烟的催化燃烧性能和表征[J].环境科学学报,2010,30(1):158-164
过渡金属-铈复合氧化物对碳烟的催化燃烧性能和表征
- Catalytic combustion performance of soot over cerium-based transition metal composite oxide catalysts
- 基金项目：广东省社会发展攻关计划项目(No.2302950B)
- 作者
- 单位
- 明彩兵
- 仲恺农业工程学院 环境科学与工程学院, 广州 510225
- 叶代启
- 华南理工大学 环境科学与工程学院, 广州 510640
- 梁红
- 广州大学 化学化工学院, 广州 510006
- 刘晖
- 仲恺农业工程学院 环境科学与工程学院, 广州 510225
- 摘要：采用共沉淀法制备了不同过渡金属(Fe、V、Mn、Co、Cu)和铈的复合体氧化物催化剂,并用程序升温还原法(H2-TPR)、BET、XRD、拉曼光谱(RS)和光电子能谱(XPS)对催化剂进行了表征.同时,利用热重法测试了催化剂对碳烟的催化活性.实验结果表明,过渡金属的添加极大地提高了氧化铈的催化活性,其中,铈铁复合氧化物的催化活性最高.催化剂催化燃烧碳烟的活性与催化剂表面的耗氢量以及催化剂表面氧种OⅡ的含量紧密相关.
- Abstract：Transition metal (Fe,V,Mn,Co and Cu)/Ce composite oxide catalysts were prepared by co-precipitation. The catalytic activity of the catalysts for soot combustion was determined by thermogravimetry (TG). The results show that the added transition metal greatly enhances the catalytic reactivity of ceria. Among the catalysts,the iron-cerium composite oxide exhibits the most activity. Catalysts were investigated by techniques such as temperature-programmed reduction (H2-TPR),BETsurface area,X-ray diffraction (XRD),Raman spectroscopy (RS) and X-ray photoelectron spectroscopy (XPS). Characterization results indicate that the catalytic performance of the catalysts greatly depends on the reducibility and superficial oxygen as well as the percentage of OⅡ non-lattice oxygen.
- Key words：cerium composite oxide soot active oxygen transition metal
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