催化作用
反应性(心理学)
X射线光电子能谱
化学
氢氧化物
协同催化
氧化还原
多相催化
氧气
无机化学
光化学
化学工程
有机化学
病理
工程类
替代医学
医学
作者
Dongqing Wang,Rongtan Li,Xiaoyuan Sun,Le Lin,Kun Li,Rankun Zhang,Rentao Mu,Qiang Fu
出处
期刊:ACS Catalysis
[American Chemical Society]
日期:2024-03-21
卷期号:14 (7): 5147-5155
被引量:6
标识
DOI:10.1021/acscatal.4c01084
摘要
Hydroxyl is ubiquitous in heterogeneous catalysis and significantly affects the catalytic performance of many important reactions. However, the complexity of practical catalysts makes direct investigation of the role of hydroxyl very challenging. In this work, partially hydroxylated CoOx nanoislands on Pt(111) with different well-defined hydroxide structures are constructed that are more reactive than pristine CoOx nanoislands for CO oxidation, as confirmed by high-pressure scanning tunneling microscopy and X-ray photoelectron spectroscopy measurements. For hydrogenated CoOx/Pt(111) containing a Co–OH bilayer, hydroxyl O (OH) and lattice O (OL) modified by hydroxyl have a similar reactivity with CO. OH in hydroxylated CoOx/Pt(111) containing HO–Co–OH trilayer has a higher reactivity than OL. In addition, the oxygen species located at edges of the nanoislands are more active than those located in the interior. The distinct OH promotion mechanisms are accordingly proposed, which are exploited to dramatically enhance the performance of real CoOx/Pt catalysts in CO oxidation via the introduction of H2 and H2O. These results provide insights into the relationship between the hydroxide structure, OH promotion mechanism, and catalytic reactivity, which contribute to the rational design of highly efficient catalysts.
科研通智能强力驱动
Strongly Powered by AbleSci AI