| 负载型LaCoO_3的催化性能与EPR研究 |
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| 引用本文： | 明彩兵,叶代启,刘晖,周遗品,吴平霄.负载型LaCoO_3的催化性能与EPR研究[J].武汉理工大学学报,2010(8). |
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| 作者姓名： | 明彩兵 叶代启 刘晖 周遗品 吴平霄 |
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| 作者单位： | 仲恺农业工程学院环境科学与工程学院;华南理工大学环境科学与工程学院; |
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| 基金项目： | 广东省社会发展攻关计划项目(2302950B); 校优秀人才基金(G2360275) |
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| 摘 要： | 用柠檬酸法制备了Ce0.6Zr0.4O2(简称CZ)和Ce0.6Zr0.35Y0.05O2(简称CZY)固溶体,分别在Ce0.6Zr0.4O2和Ce0.6Zr0.35Y0.05O2固溶体上负载不同质量的LaCoO3。用热重法测试了催化剂对碳烟的催化活性。采用程序升温还原法(H2-TPR)、比表面(BET)、X-射线衍射仪(XRD)和电子顺磁共振仪(EPR)对催化剂进行了测试。结果表明:随着钙钛矿组分La、Co在铈锆固溶体或铈锆钇固溶体表面负载量的增加,催化剂催化燃烧碳烟的起燃温度下降,催化活性增强;TPR结果显示,CZ或CZY为载体的催化剂体系,随着表面La、Co组分含量的增加,可还原氧总量也相应增加,催化活性也对应增加,表明催化剂对碳烟的催化活性与催化剂表面的氧化还原性密切相关;EPR结果也显示由于钇的掺杂增加了铈锆固溶体表面缺陷,提高了O-离子的浓度,有利于催化活性提高。
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| 关 键 词： | 铈锆固溶体 Y3+ 掺杂 碳烟 负载 |
EPR Study and Catalytic Performance of Supported LaCoO_3 |
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| MING Cai-bing,YE Dai-qi,LIU Hui,ZHOU Yi-pin,WU Ping-xiao.EPR Study and Catalytic Performance of Supported LaCoO_3[J].Journal of Wuhan University of Technology,2010(8). |
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| Authors: | MING Cai-bing YE Dai-qi LIU Hui ZHOU Yi-pin WU Ping-xiao |
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| Affiliation: | MING Cai-bing1,YE Dai-qi2,LIU Hui1,ZHOU Yi-pin1,WU Ping-xiao2(1.College of Environmental Science , Engineering,Zhongkai University of Agriculture , Engineering,Guangzhou 510225,China,2.College of Environmental Science , Engineering,South China University of Technology,Guangzhou 510640,China) |
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| Abstract: | Ce0.6Zr0.35Y0.05O2 and Ce0.6Zr0.4O2 solid solution were prepared by citric method,and then La,Co components were coated on cerium-zirconium oxides.The catalytic activity of catalysts on soot were determined by thermogravimetry(TG).Catalysts were further investigated by techniques such as temperature-programmed reduction(H2-TPR),BET surface area,X-ray diffraction(XRD),and Electron Paramagnetic Resonance Spectrometer(EPR).Results indicate the catalytic performance of catalysts is more activated with the incre... |
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| Keywords: | ceria-zirconia solid solution Y3+ doping soot coated |
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