Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487, United States.
Department of Metallurgical and Materials Engineering, The University of Alabama, Tuscaloosa, AL 35487, United States.
J Colloid Interface Sci. 2018 Dec 1;531:204-215. doi: 10.1016/j.jcis.2018.07.046. Epub 2018 Jul 19.
The effects of support structure and reducibility, oxidation and reduction treatment and ruthenium loading amount were studied in SiO nanospheres and CeO nanorods supported ruthenium catalysts on CO oxidation. 0.4, 1.0 and 5.0 wt% Ru were impregnated on SiO nanospheres and CeO nanorods using precipitation method and then the samples were oxidized in air. Half of the oxidized samples were also further reduced under hydrogen atmosphere to compare the effect of reduction treatment on the catalytic activity. Detailed XRD, Raman, TEM, H-TPR, and CO oxidation analyses were carried out to understand the effects of RuO-support interaction, oxidation and reduction treatment and ruthenium loading amount on the catalytic performance. Compared to SiO nanospheres supported ruthenium catalysts, both the oxidized and reduced RuO/CeO catalysts exhibited superior catalytic performance in terms of CO conversion and low-temperature hydrogen consumption. After the reduction treatment in H, the RuO/CeO catalysts is further activated for low-temperature CO conversion. Especially, the 5.0 wt% Ru/CeO-reduction sample can achieve ∼9% CO conversion at near room temperature. The enhanced low-temperature activity of CeO nanorods supported ruthenium catalysts was correlated strongly to the surface defects on CeO nanorods, dispersion of RuO, and interfacial structures between CeO and RuO.
研究了在 SiO 纳米球和 CeO 纳米棒负载的钌催化剂上，支撑结构和可还原性、氧化还原处理以及钌负载量对 CO 氧化的影响。采用沉淀法将 0.4、1.0 和 5.0wt%的 Ru 浸渍在 SiO 纳米球和 CeO 纳米棒上，然后将样品在空气中氧化。一半的氧化样品也在氢气气氛下进一步还原，以比较还原处理对催化活性的影响。详细的 XRD、拉曼、TEM、H-TPR 和 CO 氧化分析用于了解 RuO-载体相互作用、氧化还原处理以及钌负载量对催化性能的影响。与 SiO 纳米球负载的钌催化剂相比，氧化和还原的 RuO/CeO 催化剂在 CO 转化率和低温氢气消耗方面表现出优异的催化性能。在 H 中还原处理后，RuO/CeO 催化剂进一步活化，用于低温 CO 转化。特别是，5.0wt% Ru/CeO-还原样品在接近室温时可实现约 9%的 CO 转化率。CeO 纳米棒负载钌催化剂的低温活性增强与 CeO 纳米棒上的表面缺陷、RuO 的分散以及 CeO 和 RuO 之间的界面结构密切相关。
