Duan Dong, Hao Chunxi, Shi Wenyu, Wang Haiyang, Sun Zhanbo
School of Science, MOE Key Laboratory for Non-Equilibrium Synthesis and Modulation of Condensed Matter, Key Laboratory of Shaanxi for Advanced Functional Materials and Mesoscopic Physics, Xi'an Jiaotong University Xi'an 710049 PR China
RSC Adv. 2018 Mar 21;8(21):11289-11295. doi: 10.1039/c8ra01219a.
A series of CoO catalysts modified by Sm were prepared by a combined dealloying and calcination approach, and the catalytic activities were evaluated using CO catalytic oxidation. The SmO/CoO catalysts were composed of a large number of nanorods and nanosheets, and exhibited a three-dimensional supporting structure with pores. The experimental results revealed that the addition of a small amount of Sm into the precursor AlCo alloy led to a dealloyed sample with improved catalytic activity, and the dealloyed AlCoSm ribbons (0.5 SmO/CoO) calcined at 300 °C showed the highest activity for CO oxidation with complete CO conversion at 135 °C, moreover, CO conversion almost no attenuation, even after 70 hours of catalytic oxidation, which is superior to that of CoO. The enhanced catalytic activity of the SmO/CoO catalyst can be attributed to the large specific surface area, more reactive oxygen species and Co ion, as well as electronic interactions between Sm and Co.
通过脱合金和煅烧相结合的方法制备了一系列经Sm改性的CoO催化剂，并采用CO催化氧化对其催化活性进行了评价。SmO/CoO催化剂由大量纳米棒和纳米片组成，呈现出具有孔隙的三维支撑结构。实验结果表明，向前驱体AlCo合金中添加少量Sm可得到催化活性提高的脱合金样品，在300℃煅烧的脱合金AlCoSm带材（0.5 SmO/CoO）在135℃时对CO氧化表现出最高活性，CO完全转化，而且即使经过70小时的催化氧化，CO转化率几乎没有衰减，优于CoO。SmO/CoO催化剂催化活性增强可归因于大比表面积、更多的活性氧物种和Co离子，以及Sm和Co之间的电子相互作用。
