通过选择性Caryl-O(C) 键裂变:吸附的调节
Yuanqing He1, Xu Zeng2, Zhuoran Lu1
1State Key Laboratory of Chem/Bio-Sensing and Chemometrics, Advanced Catalytic Engineering Research Center of the Ministry of Education, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, China.
Journal of the American Chemical Society
|November 5, 2024
概括
研究人员开发了一种水性电化学方法来打破素的氧 (Caryl-O(C)) 键. 这种策略增强了素模型化合物的吸附,显著提高了基和醇等有价值产品的产量.
科学领域:
- 电化学
- 催化剂
- 生物质利用
背景情况:
- 在素的β-O-4连接中,氧 (Caryl-O(C)) 键的裂变对于提高降解产品的价值至关重要.
- 由于高结合能和基质过度减少,电化学Caryl-O(C) 键断裂具有挑战性.
研究的目的:
- 开发一种水性电化学还原策略,用于打破素中的Caryl-O(C) 键.
- 通过提高产品产量和选择性来增强木质素的价值.
主要方法:
- 使用密度功能理论 (DFT) 计算和石英晶体微平衡 (QCM) 测量以了解分子吸附和反应机制.
- 在水性未分割电池中使用的铜I) 改性铜II) 氧化物 (CuO) 纳米电催化剂.
- 应用现场同步辐射里埃变换红外光谱 (SR-FTIR) 来确定反应途径.
主要成果:
- 使用CuO电催化剂,显著增强了Caryl-O(C) 键的吸附,并降低了质子攻击能量屏障.
- 使用CuO纳米棒在-0.4V与RHE实现了高 (95.3%) 和醇 (88.6%) 的产量,性能优于裸体Cu催化剂.
- 在木木质素电解中成功应用,产生10.9%重量%的瓜亚基糖醇,选择性>63.0%.
结论:
- 开发的水性电化学还原策略有效地破坏了素模型化合物和实际素中的Caryl-O(C) 键.
- 在CuO中的残留Cu (I) 在调节分子吸附和促进键裂变方面发挥着关键作用.
- 这项工作提供了一种高效和温和的素价值化方法,为获得有价值的芳香化学物质提供了有希望的途径.
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