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首页> 外文期刊>Applied Surface Science >Influence of different impregnation modes on the properties of CuO-CeO2/gamma-Al2O3 catalysts for NO reduction by CO
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Influence of different impregnation modes on the properties of CuO-CeO2/gamma-Al2O3 catalysts for NO reduction by CO

机译：不同浸渍方式对CuO-CeO2 /γ-Al2O3催化剂上CO还原NO性能的影响

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摘要

A series of ceria modified CuO/gamma-Al2O3(CuO-CeO2/gamma-Al2O3) catalysts were prepared via stepwise impregnation (CuCeAl-SI) and co-impregnation (CuCeAl-CI) method and tested in the model reaction of NO reduction by CO. It was found that the influence of impregnation modes on the catalytic properties of CuCeAl samples mainly lies on the control of ceria particle sizes and modulation of the distribution of various copper species. In both impregnation modes, ceria was mainly spread on gamma-Al2O3 as small particles while copper species were highly dispersed. A quantitative estimation of copper species was tentatively provided via a combined surface acid leaching experiment and H-2-TPR characterization for the first time. The results showed that for CuCeAl-CI catalyst, about 55% and 25% copper species were dispersed on gamma-Al2O3 and nanosized ceria, respectively, while about 20% was migrated into ceria lattice during the calcination process. In contrast, in CuCeAl-SI sample, the corresponding values changed to about 25%, 70% and 5%, respectively. The synergistic effect between copper species and ceria can promote the improvement of catalytic performance, which results in higher activity of CuCeAl-SI than that of CuCeAl-CI catalyst. (C) 2017 Elsevier B.V. All rights reserved.
机译：通过逐步浸渍（CuCeAl-SI）和共浸渍（CuCeAl-CI）方法制备了一系列二氧化铈改性的CuO /γ-Al2O3（CuO-CeO2 /γ-Al2O3）催化剂，并在通过NO还原的模型反应中进行了测试发现浸渍方式对CuCeAl样品催化性能的影响主要在于控制氧化铈粒径和调节各种铜的分布。在两种浸渍方式下，二氧化铈主要以小颗粒的形式散布在γ-Al2O3上，而铜则高度分散。首次通过表面酸浸实验和H-2-TPR表征的组合，初步提供了铜种类的定量估计。结果表明，对于CuCeAl-Cl催化剂，分别有约55％和25％的铜物种分散在γ-Al2O3和纳米级二氧化铈上，而约20％的铜物种在煅烧过程中迁移到二氧化铈晶格中。相反，在CuCeAl-SI样品中，相应的值分别变为约25％，70％和5％。铜和二氧化铈之间的协同作用可以促进催化性能的提高，从而导致CuCeAl-SI的活性高于CuCeAl-CI催化剂的活性。 （C）2017 Elsevier B.V.保留所有权利。

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  • 来源
    《Applied Surface Science》 |2017年第31期|279-286|共8页
  • 作者

    Sun Jingfang; Ge Chengyan; Yao Xiaojiang; Zou Weixin; Hong Xi; Tang Changjin; Dong Lin;

  • 作者单位

    Nanjing Univ, Sch Chem & Chem Engn, Jiangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China;

    Yancheng Inst Technol, Sch Chem & Chem Engn, Yancheng 224051, Peoples R China;

    Chinese Acad Sci, Chongqing Inst Green & Intelligent Technol, Res Ctr Atmospher Environm, Chongqing 400714, Peoples R China;

    Nanjing Univ, Sch Chem & Chem Engn, Jiangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China;

    Nanjing Tech Univ, Sch Environm Sci & Engn, Nanjing 211816, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Chem & Chem Engn, Jiangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China;

    Nanjing Univ, Sch Chem & Chem Engn, Jiangsu Key Lab Vehicle Emiss Control, Nanjing 210093, Jiangsu, Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Impregnation modes; CuO-CeO2/gamma-Al2O3; NO plus CO; Co-impregnation; Stepwise impregnation;

    机译：浸渍方式;CuO-CeO2 /γ-Al2O3;NO加CO;共浸渍;逐步浸渍;

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