Graphical abstract<'/> In situ DRIFTS investigation of NH_3-SCR reaction over CeO_2/zirconium phosphate catalyst
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In situ DRIFTS investigation of NH_3-SCR reaction over CeO_2/zirconium phosphate catalyst

机译：CeO_2 /磷酸锆催化剂上NH_3-SCR反应的原位DRIFTS研究

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Graphical abstractThe CeO2modified zirconium phosphate catalysts exhibited excellent catalytic activity for selective catalytic reduction of NO with NH3at 150–450 °C. The interaction between CeO2and zirconium phosphate enhanced redox ability and surface acidity. The NH3-SCR reaction over the catalysts followed both the Eley-Rideal (E-R) and Langmuir-Hinshelwood (L-H) mechanisms.Display OmittedHighlights•CeO2/ZrP exhibited high activity for NH3-SCR.•The SCR reaction over 20CeO2/ZrP followed “L-H” and “E-R” routes.•The enhanced redox property promoted the adsorptive oxidation of NO.•The interaction between CeO2and zirconium phosphate enhanced the surface acidity.AbstractA series of ceria modified zirconium phosphate catalysts were synthesized for selective catalytic reduction of NO with ammonia (NH3-SCR). Over 98% NOxconversion and 98% N2selectivity were obtained by the CeO2/ZrP catalyst with 20 wt.% CeO2loading at 250–425 °C. The interaction between CeO2and zirconium phosphate enhanced the redox abilities and surface acidities of the catalysts, resulting in the improvement of NH3-SCR activity. Thein situDRIFTS results indicated that the NH3-SCR reaction over the catalysts followed both Eley-Rideal and Langmuir-Hinshelwood mechanisms. The amide (NH2) groups and the NH4+bonded to Brønsted acid sites were the important intermediates of Eley-Rideal mechanism.
机译： 图形摘要 < ce：simple-para id =“ spar0065” view =“ all”> CeO 2 改性的磷酸锆催化剂表现出优异的催化活性，可选择性催化还原NO。 NH 3 在150–450°C下进行。 CeO 2 与磷酸锆之间的相互作用增强了氧化还原能力和表面酸度。催化剂上的NH 3 -SCR反应遵循Eley-Rideal（ER）和Langmuir-Hinshelwood（LH）机理。 省略显示 突出显示 < ce：list id =“ lis0005”> • CeO < ce：inf loc =“ post”> 2 / ZrP对NH 3 -SCR表现出高活性。 < / ce：list-item> • SCR对20CeO 2 / ZrP遵循“ LH”和“ ER”路线。 • 增强的氧化还原特性促进了NO的吸附氧化。 • CeO 2 和磷酸锆增强了表面酸度。 摘要 合成了一系列氧化铈改性的磷酸锆催化剂，用于用氨（NH）选择性催化还原NO 3 -SCR）。超过98％的NO x 转化和98％的N 2 的选择性是通过CeO 2 / ZrP催化剂与20％wt。％CeO 2 在250–425 C下加载。 CeO 2 与磷酸锆之间的相互作用增强了催化剂的氧化还原能力和表面酸度，从而改善了NH 3 -SCR活动。 原位 DRIFTS结果表明，在催化剂上的NH 3 -SCR反应遵循Eley-Rideal和Langmuir -欣舍伍德机制。酰胺（NH 2 ）组和NH 4 + 结合到布朗斯台德酸位上是Eley-Rideal机制的重要中间体。

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  • 来源
    《Applied Surface Science》 |2018年第30期|1037-1045|共9页
  • 作者

    Qiulin Zhang; Jie Fan; Ping Ning; Zhongxian Song; Xin Liu; Lanying Wang; Jing Wang; Huimin Wang; Kaixian Long;

  • 作者单位

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

    Faculty of Environmental Science and Engineering, Kunming University of Science and Technology;

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  • 正文语种 eng
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  • 关键词

    Ceria; Zirconium phosphate; Surface acidity; NH3-SCR; NOxconversion;

    机译：二氧化铈;磷酸锆;表面酸度;NH3-SCR;NOx转化;

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