Takawane Smita, Miyamoto Masatoshi, Kondo Atsushi, Urita Koki, Ohba Tomonori
Graduate School of Science, Chiba University, Yayoi, Inage, Chiba 263-8522, Japan.
Department of Science and Technology, Faculty of Science and Technology, Oita University, Oita 870-1192, Japan.
Nanomaterials (Basel). 2025 Mar 22;15(7):479. doi: 10.3390/nano15070479.
The continuous increase in global energy consumption has caused a considerable increase in CO emissions and environmental problems. To address these challenges, adsorbents and catalytic materials that can effectively reduce the CO levels in the atmosphere should be developed. Metal-organic frameworks (MOFs) have emerged as promising materials for CO capture owing to their high surface areas and tunable structures. Herein, the CO adsorption properties of MIL-100(Fe) and UiO-66(Zr) were investigated. Both MOFs exhibited excellent thermal stability and high CO adsorption capacities at 300 K, and they maintained good adsorption properties at 500 K compared to those of activated carbon fiber owing to their high adsorption potentials. A slight change in the UiO-66(Zr) structure and no change in the MIL-100(Fe) structure were observed under the CO atmosphere at 500 K. At that time, CO emissions and changes in the carboxyl and OCO functional groups were observed on MIL-100(Fe), suggesting a mechanism of CO reduction to CO on the bare Fe(II) sites. These findings confirm the potential of MOFs for the thermo-catalytic reduction of CO to achieve effective CO capture and conversion.
全球能源消耗的持续增长导致二氧化碳排放量显著增加以及环境问题。为应对这些挑战，应开发能够有效降低大气中一氧化碳水平的吸附剂和催化材料。金属有机框架材料（MOFs）因其高比表面积和可调节结构而成为有前景的一氧化碳捕获材料。在此，研究了MIL-100(Fe)和UiO-66(Zr)的一氧化碳吸附性能。两种MOF在300 K时均表现出优异的热稳定性和高一氧化碳吸附容量，并且由于其高吸附潜力，与活性炭纤维相比，在500 K时仍保持良好的吸附性能。在500 K的一氧化碳气氛下，观察到UiO-66(Zr)结构有轻微变化，而MIL-100(Fe)结构没有变化。此时，在MIL-100(Fe)上观察到一氧化碳排放以及羧基和OCO官能团的变化，这表明在裸露的Fe(II)位点上一氧化碳还原为二氧化碳的机制。这些发现证实了MOF在热催化还原一氧化碳以实现有效一氧化碳捕获和转化方面的潜力。
