Abstract Copper–ceria (CuO–CeO2) catalysts have been known to be very effective for the oxidation of CO, and their chemical behavior has been extensively studied during the last decades. However, the effect of different CeO2 crystal surfaces on the catalytic activity of CuO–CeO2 for the oxidation of CO is still unclear and should be further elucidated. In this study, we deposited 1 wt% Cu on mostly {100}-exposed CeO2 nanocubes (1CuCe NC) and mostly {110}-exposed CeO2 nanorods (1CuCe NR), respectively. Both 1CuCe NC and 1CuCe NR have been used as catalysts for the oxidation of CO and achieved 100% and 50% CO conversion at 130 dC, respectively. The differences in the catalytic activity of 1CuCe NC and 1CuCe NR were analyzed using temperature-programmed reduction of H2 and temperature-programmed desorption of CO techniques. The results confirmed the excellent reducibility of the 1CuCe NC catalyst, which was attributed to the weak interactions between Cu and the CeO2 support. Moreover, in situ diffuse reflectance infrared Fourier-transform spectroscopy studies indicated that the {100} planes of 1CuCe NC facilitated the generation of active Cu(I) sites, which resulted in the formation of highly reactive Cu(I)-CO species during the oxidation of CO. Both the excellent redox properties and effective CO adsorption capacity of the 1CuCe NC catalyst increased its catalytic reactivity.

中文翻译：

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深入了解作为 CO 氧化反应催化剂的 CuO-CeO2 纳米立方体和纳米棒的面相关反应性

摘要 众所周知，铜-氧化铈 (CuO-CeO2) 催化剂对 CO 的氧化非常有效，并且在过去的几十年中对其化学行为进行了广泛的研究。然而，不同CeO2晶体表面对CuO-CeO2氧化CO催化活性的影响尚不清楚，有待进一步阐明。在这项研究中，我们分别在大部分暴露于 {100} 的 CeO2 纳米立方体（1CuCe NC）和大部分暴露于 {110} 的 CeO2 纳米棒（1CuCe NR）上沉积了 1wt% 的铜。1CuCe NC 和 1CuCe NR 均已用作 CO 氧化的催化剂，并在 130 dC 下分别实现了 100% 和 50% 的 CO 转化率。使用 H2 程序升温还原和 CO 程序升温解吸技术分析了 1CuCe NC 和 1CuCe NR 催化活性的差异。结果证实了 1CuCe NC 催化剂具有优异的还原性，这归因于 Cu 和 CeO2 载体之间的弱相互作用。此外，原位漫反射红外傅里叶变换光谱研究表明，1CuCe NC 的 {100} 面促进了活性 Cu(I) 位点的生成，从而导致在CO的氧化。1CuCe NC催化剂优异的氧化还原性能和有效的CO吸附能力提高了其催化反应活性。