在减少的石墨烯氧化物上固定单层CoMoS,以有效和稳定地将红素衍生的化合物转化为
Jing Cao1, Peiling Liu1, Fangmei Teng1
1Department of Chemistry and Chemical Engineering, Hunan Institute of Science and Technology, Yueyang 414006 Hunan, China.
一种新的单层CoMoS催化剂在疏水性减少石墨烯氧化物 (SL-CoMoS/rGO) 上显示出极好的活性和稳定性,用于化合物的氧化 (HDO). 这种催化剂在温和条件下有效地将4-甲基转化为.
科学领域:
- 催化剂
- 材料科学
- 化学工程
背景情况:
- 素衍生物的氧化 (HDO) 对于产生烯至关重要.
- 开发高活性和稳定的MoS2基催化剂仍然是一个重大挑战.
- 现有的催化剂经常因硫损失和颗粒烧结而失活.
研究的目的:
- 制造一种强大的催化剂,用于高效的酸.
- 研究在疏水性降解石墨烯氧化物 (SL-CoMoS/rGO) 上固定单层 CoMoS 的催化性能和稳定性.
- 了解结构与活动的关系以及增强性能背后的机制.
主要方法:
- 在疏水性降解石墨烯氧化物 (SL-CoMoS/rGO) 上结的单层 CoMoS 的合成.
- 在4 - 甲基的氧化过程中测试催化剂作为模型反应.
- 催化剂的结构和活性部位的特征.
- 密度函数理论 (DFT) 计算以阐明反应机制.
主要成果:
- 在210°C和3.0MPa下,SL-CoMoS/rGO催化剂实现了98.3%的转化率和99.2%的托选择性.
- 由于MoS2的高分散率和高效的化,形成了Co-Mo-S活跃中心,削弱了Mo-S键并增加了硫空缺.
- DFT计算证实了4-甲基的有利吸附,并降低了确定速率的能量障碍.
- 催化剂在六个HDO循环后表现出极好的稳定性,没有明显的失活.
结论:
- SL-CoMoS/rGO 催化剂具有较高的活性,选择性和稳定性.
- 增强的性能归因于独特的Co-Mo-S活性位点和rGO支持的疏水性质.
- 催化剂的耐用性与在温和反应条件下减少硫损失和颗粒烧结有关.
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