Krawczyk Paweł A, Wyrwa Jan, Kubiak Władysław W
Faculty of Materials Science and Ceramics, AGH University of Krakow, Al. Mickiewicza 30, 30-059 Kraków, Poland.
Materials (Basel). 2024 Apr 19;17(8):1883. doi: 10.3390/ma17081883.
This study investigated the catalytic properties of low-temperature oxidation of carbon monoxide, focusing on (YLaNdGdSm)CoO synthesized via a glycothermal method using 1,4-butanediol and diethylene glycol at 250 °C. This synthesis route bypasses the energy-intensive sintering process at 1200 °C while maintaining a high-entropy single-phase structure. The synthesized material was characterized structurally and chemically by X-ray diffraction and SEM/EDX analyses. The material was shown to form nanofibers of (YLaNdGdSm)CoO, thereby increasing the active surface area for catalytic reactions, and crystallize in the model Pbnm space group of distorted perovskite cell. Using a custom setup to investigate catalytic properties of (YLaNdGdSm)CoO, the CO oxidation behavior of those high-entropy perovskite oxide was investigated, showing an overall conversion of 78% at 50 °C and 97% at 100 °C. These findings highlight the effective catalytic activity of nanofibers of (YLaNdGdSm)CoO under mild conditions and their versatility in various catalytic processes of robust CO neutralization. The incorporation of rare-earth elements into a high-entropy structure could impart unique catalytic properties, promoting a synergistic effect that enhances performance.
本研究考察了一氧化碳低温氧化的催化性能，重点研究了在250℃下通过使用1,4 - 丁二醇和二甘醇的甘醇热法合成的(YLaNdGdSm)CoO。该合成路线绕过了在1200℃下耗能的烧结过程，同时保持了高熵单相结构。通过X射线衍射和扫描电子显微镜/能谱分析（SEM/EDX）对合成材料进行了结构和化学表征。结果表明，该材料形成了(YLaNdGdSm)CoO纳米纤维，从而增加了催化反应的活性表面积，并在畸变钙钛矿晶胞的Pbnm空间群模型中结晶。使用定制装置研究(YLaNdGdSm)CoO的催化性能，考察了这些高熵钙钛矿氧化物的CO氧化行为，结果表明在50℃时总转化率为78%，在100℃时为97%。这些发现突出了(YLaNdGdSm)CoO纳米纤维在温和条件下的有效催化活性及其在各种强大的CO中和催化过程中的多功能性。将稀土元素掺入高熵结构中可以赋予独特的催化性能，促进协同效应从而提高性能。
