期刊論文
| 學年 | 113 |
|---|---|
| 學期 | 2 |
| 出版（發表）日期 | 2025-03-24 |
| 作品名稱 | Electronic structural modulation for CO-CO2 conversion of copper-modified nanoceria studied by in situ x-ray absorption spectroscopy |
| 作品名稱（其他語言） | |
| 著者 | Thanigai Arul Kumaravelu; Jeng-Lung Chen; Chi-Liang Chen; Shih-Yun Chen; Da-Hua Wei; Shih-Hsien Chen; Ta Thi Thuy Nga; Wu-Ching Chou; Chung-Li Dong |
| 單位 | |
| 出版者 | |
| 著錄名稱、卷期、頁數 | Inorganic Chemistry 64(11), p.5375-5385 |
| 摘要 | Metal-supported cerium dioxide catalysts are widely used in industrial processes. This study investigates copper–cerium dioxide (Cu-CeO2) as a promising catalyst for CO oxidation, noted for its cost-effectiveness and low activation temperature. However, the reaction mechanism remains unclear. We examine the effects of copper ion doping into CeO2 nanoparticles at 0, 5, 15 at%, synthesized via precipitation. X-ray diffraction (XRD) analysis confirmed sample purity, revealing partial amorphization at a higher doping level. Lower Cu concentration in CeO2 facilitated CO oxidation at a lower temperature. X-ray absorption spectroscopy (XAS) investigated the electronic and atomic structures, showing that CeO2 with a lower Cu doping resulted in a higher lattice oxygen content and moderate Cu ion reduction. Increased Cu doping decreased Ce–O coordination numbers, while Cu–O radial distance was larger at lower doping. In situ XAS identified moderate reduction of Ce and Cu, elucidating CO oxidation via the Langmuir–Hinshelwood (LH) mechanism at lower Cu concentration. The superior low-temperature CO oxidation performance is attributed to moderate Ce and Cu ion reduction coupled with increased oxygen adsorption on the catalyst surface. These findings provide insights into the relationship between the dopant concentration, electronic structure, and catalytic activity for optimizing ceria-based catalysts for efficient CO oxidation. |
| 關鍵字 | |
| 語言 | en |
| ISSN | 0020-1669; 1520-510X |
| 期刊性質 | 國外 |
| 收錄於 | SCI |
| 產學合作 | |
| 通訊作者 | |
| 審稿制度 | 是 |
| 國別 | USA |
| 公開徵稿 | |
| 出版型式 | ,電子版,紙本 |
| 相關連結 |
機構典藏連結 ( http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/129543 ) |