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首页> 外文期刊>RSC Advances >Electrospinning of CeO2 nanoparticle dispersions into mesoporous fibers: on the interplay of stability and activity in the HCl oxidation reaction
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Electrospinning of CeO2 nanoparticle dispersions into mesoporous fibers: on the interplay of stability and activity in the HCl oxidation reaction

机译：CeO2纳米粒子分散在中孔纤维中的静电纺丝：在HCl氧化反应中的稳定性和活性的相互作用

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CeO2 nanoparticles with diameters of ca. 6 nmwere synthesized using a microwave-based synthetic route, enabling dispersions in various unipolar solvents. From these dispersions, CeO2 nanofibers were prepared by electrospinning followed by heat treatment at 550 degrees C in air, possessing mesoporosity with BET surface areas larger than 100m(2) g(-1). This mesoporosity is due to a nanoscale separation between the nanoparticles and the spinning polymer. The well-defined CeO2 fibers were used as catalysts in the HCl oxidation reaction (Deacon process), and the catalytic parameters (space-time yield (STY), oxygen storage capacity (OSC), and the so-called complete oxygen storage capacity (OSCc)) were compared with recently reported nanoscopic CeO2 materials. It is found that the fibers and also the particles themselves show comparably high activity (STY), which correlates with a high OSCc value, in comparison with CeO2 materials possessing larger particle sizes. This correlation implies that the entire particles, not only the surface, are involved in oxidation reactions. In the HCl oxidation reaction, the fiber morphology is degraded and the surface area is substantially decreased, but the activity is still quite high after 60 h on stream, and no chlorination is detectable by X-ray Diffraction, in contrast to CeO2 materials with larger particle sizes. These findings demonstrate that the stability and activity of CeO2-based catalysts can only be scrutinized by a material comprising both a high surface area and well-defined morphology.
机译：纳米CeO 2颗粒的直径约的6使用基于微波的合成路线合成nmwere，使在各个单极溶剂中的分散。从这些分散体中，通过静电纺丝后进行热处理，在550℃下在空气中氧化铈制备纳米纤维，具有与BET表面积超过100m（2）放大的中孔隙克（-1）。这中孔是由于纳米颗粒和纺丝聚合物之间的纳米级的分离。该明确定义的氧化铈纤维作为在盐酸氧化反应（Deacon法）催化剂，催化参数（时空产率（STY），储氧能力（OSC），和所谓的完整的储氧能力（口腔鳞状细胞癌））与最近报道的纳米氧化铈材料进行了比较。据发现，所述纤维以及还有微粒本身表现出相当高的活性（STY），该具有高OSCC值相关，与具有较大的颗粒尺寸的CeO 2的材料进行比较。这个相关性，整个粒子，不仅表面，参与氧化反应。在盐酸氧化反应中，纤维形态变差，表面积显着减小，但活动仍然在流60小时后相当高，没有氯化是通过X射线衍射检测的，而相比之下，氧化铈的材料具有较大的颗粒尺寸。这些结果表明，CeO2基催化剂的稳定性和活性可以仅由一种材料，包括既具有高表面积和良好限定的形态被审查。

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  • 来源
    《RSC Advances》 |2018年第1期|共13页
  • 作者

    Moeller Maren; Tarabanko Nikolay; Wessel Claas; Ellinghaus Ruediger; Over Herbert; Smarsly Bernd M.;

  • 作者单位

    Justus Liebig Univ Giessen Phys Chem Inst D-35392 Giessen Germany;

    Justus Liebig Univ Giessen Phys Chem Inst D-35392 Giessen Germany;

    Justus Liebig Univ Giessen Phys Chem Inst D-35392 Giessen Germany;

    Justus Liebig Univ Giessen Phys Chem Inst D-35392 Giessen Germany;

    Justus Liebig Univ Giessen Phys Chem Inst D-35392 Giessen Germany;

    Justus Liebig Univ Giessen Phys Chem Inst D-35392 Giessen Germany;

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