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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：CeO 2 纳米颗粒分散体电纺成介孔纤维：在HCl氧化反应中稳定性和活性之间的相互作用

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CeO2 nanoparticles with diameters of ca. 6 nm were 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 °C in air, possessing mesoporosity with BET surface areas larger than 100 m2 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：使用基于微波的合成路线合成了直径为 ca。 6 nm的CeO 2 纳米粒子。该纳米粒子可以分散在各种单极性溶剂中。从这些分散体中，通过静电纺丝，然后在550°C的空气中进行热处理，制备了CeO 2 纳米纤维，该介孔具有BET表面积大于100 m < sup> 2 g ？1 。该介孔性是由于纳米颗粒和纺丝聚合物之间的纳米级分离。定义明确的CeO 2 纤维在HCl氧化反应（迪肯法）中用作催化剂，催化参数（时空产率（STY），储氧量）与最近报道的纳米CeO 2 纳米材料进行了比较。发现与具有较大颗粒的CeO 2 材料相比，纤维以及颗粒本身都具有较高的活性（STY），这与较高的OSCc值相关。大小。这种相关性意味着整个颗粒，不仅是表面，都参与了氧化反应。在HCl氧化反应中，纤维形态下降，表面积显着降低，但是在运行60 h后，活性仍然很高，与CeO相比，X射线衍射检测不到氯化。粒径较大的 2 材料。这些发现表明，基于CeO 2 的催化剂的稳定性和活性只能由同时具有高表面积和良好形态的材料来研究。

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