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Ultrasmall Metal-Doped CeO2 Nanoparticles for Low-Temperature CO Oxidation
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-16 , DOI: 10.1021/acsanm.0c02090 Georgia Basina 1 , Kyriaki Polychronopoulou 2, 3 , Abdallah F. Zedan 4, 5 , Konstantinos Dimos 6 , Marios S. Katsiotis 7 , Apostolos P. Fotopoulos 8 , Issam Ismail 1 , Vasileios Tzitzios 1, 9
ACS Applied Nano Materials ( IF 5.3 ) Pub Date : 2020-10-16 , DOI: 10.1021/acsanm.0c02090 Georgia Basina 1 , Kyriaki Polychronopoulou 2, 3 , Abdallah F. Zedan 4, 5 , Konstantinos Dimos 6 , Marios S. Katsiotis 7 , Apostolos P. Fotopoulos 8 , Issam Ismail 1 , Vasileios Tzitzios 1, 9
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Ultrasmall ceria (CeO2) and metal-doped CeO2 nanoparticles in the sub-3 nm size regime were synthesized via a facile, single-step, liquid-phase thermal decomposition reaction in a monosurfactant medium, which plays the role of a solvent and coordination molecule. The nanoparticles were characterized by a combination of techniques including powder X-Ray diffraction, Raman spectroscopy, and high-resolution transmission electron microscopy, and their catalytic activity was tested for the CO oxidation reaction. The results show that all the materials are highly crystalline in the as-synthesized form and monodispersed with a near-spherical shape. N2 sorption studies and porosity analysis confirm that the prepared materials after thermal treatment at 450 °C possess a very high specific surface area, up to 240 m2 g–1, and additionally a hierarchical mesoporous structure. The CeO2 and doped-CeO2 particles demonstrate superior catalytic activity for the low-temperature CO oxidation. Among the different kinds of doping, the Cu–Co co-doped CeO2 nanoparticles are the most active for the CO oxidation (T50 ≈ 54 °C and Ea = 39.5 kJ mol–1) followed by the Cu and Sm-doped CeO2 ones.
中文翻译：
超小型金属掺杂CeO 2纳米颗粒，用于低温CO氧化
通过在单表面活性剂介质中进行的简便，一步式液相热分解反应，合成了亚3纳米尺寸范围的超小二氧化铈（CeO 2）和金属掺杂的CeO 2纳米颗粒，该表面活性剂起着溶剂和溶剂的作用。配位分子。通过包括粉末X射线衍射，拉曼光谱和高分辨率透射电子显微镜的技术组合来表征纳米颗粒，并测试了它们对于CO氧化反应的催化活性。结果表明，所有材料均为合成形式的高度结晶并以近球形单分散。N 2吸附研究和孔隙度分析证实，在450°C热处理后，制备的材料具有非常高的比表面积，最大240 m 2 g –1，并且具有分层的介孔结构。CeO 2和掺杂的CeO 2颗粒对低温CO氧化表现出优异的催化活性。之间的不同种类的掺杂的，所述铜钴共掺杂的CeO 2纳米颗粒是最活跃的CO氧化（Ť 50 ≈54℃和Ë一个= 39.5千焦摩尔-1），接着在Cu和Sm掺杂CeO 2个。
更新日期：2020-11-25
中文翻译：
超小型金属掺杂CeO 2纳米颗粒，用于低温CO氧化
通过在单表面活性剂介质中进行的简便，一步式液相热分解反应，合成了亚3纳米尺寸范围的超小二氧化铈（CeO 2）和金属掺杂的CeO 2纳米颗粒，该表面活性剂起着溶剂和溶剂的作用。配位分子。通过包括粉末X射线衍射，拉曼光谱和高分辨率透射电子显微镜的技术组合来表征纳米颗粒，并测试了它们对于CO氧化反应的催化活性。结果表明，所有材料均为合成形式的高度结晶并以近球形单分散。N 2吸附研究和孔隙度分析证实，在450°C热处理后，制备的材料具有非常高的比表面积，最大240 m 2 g –1，并且具有分层的介孔结构。CeO 2和掺杂的CeO 2颗粒对低温CO氧化表现出优异的催化活性。之间的不同种类的掺杂的，所述铜钴共掺杂的CeO 2纳米颗粒是最活跃的CO氧化（Ť 50 ≈54℃和Ë一个= 39.5千焦摩尔-1），接着在Cu和Sm掺杂CeO 2个。
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