一个单位MoO2催化中心的合成和结构-活动特征
Yiqi Liu1, Jiaqi Li1, Anusheela Das2
1Department of Chemistry and the Institute for Catalysis in Energy Processes (ICEP), Northwestern University, Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|December 16, 2021
概括
这项研究引入了一种新型的减少氧化石烯 (rGO/MoO2) 的单位二氧化催化剂. 这种先进的异质催化剂具有高活性和可回收性,可用于还原性碳结合反应.
科学领域:
- 不同质的催化
- 材料科学
- 表面化学
背景情况:
- 单位异质催化剂提供了一种跨越同质和异质催化物的途径.
- 在复杂的支物,如减少氧化石墨烯 (rGO) 上进行催化剂的表征存在挑战.
- 了解移植的表面物种对于合理的催化剂设计至关重要.
研究的目的:
- 在减少的氧化石烯 (rGO/MoO2) 上移植的单位二氧化物 (Mo(O2) 物种的合成和特征.
- 研究rGO/MoO2催化剂的结构,电子和表面特性.
- 评估rGO/MoO2系统在还原性碳结合中的催化性能和稳定性.
主要方法:
- 描述技术包括XPS,DRIFTS,粉末XRD,N2物理吸收,NH3-TPD,接触角度,Mo EXAFS和DFT计算.
- 使用还原性碳结合反应评估了催化活性.
- 评估了活性场所的可访问性和催化剂的可回收性.
主要成果:
- XPS证实了Mo(VI) 的氧化状态,而DRIFTS和DFT则确定了孤立的cis- ((OMoO) 部分.
- Mo EXAFS数据支持孤立的 (C-O) 2-Mo (O) 2物种的存在.
- rGO/MoO2催化剂具有高活性 (TOF ~1.81 × 10^3 h^-1) 和强度,具有69%的催化显著的Mo位点.
结论:
- rGO/MoO2 是一个结构上明确的单位异质催化剂.
- 催化剂显示了高效和可回收的还原性碳结合的巨大潜力.
- 这种系统推进了下一代单位异质催化剂的设计原理.
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