在温和条件下释放高效氨基合成的单原子和纳米粒子双催化剂
Yanliang Zhou1, Bo Yang2, Lu Wang2
1National Engineering Research Center of Chemical Fertilizer Catalyst, State Key Laboratory of Fluorine & Nitrogen Chemical, Fuzhou University, Fuzhou, Fujian 350002, China.
Journal of the American Chemical Society
|August 18, 2025
概括
在温和条件下使用单个原子和CeO2上的纳米颗粒的新型联催化剂能够有效合成氨 (NH3). 这种设计克服了 (N2) 和 (H2) 激活的挑战,以提高催化性能.
科学领域:
- 催化剂
- 材料科学
- 化学工程
背景情况:
- 传统上,哈伯-博什氨合成需要严苛的条件.
- 在温和条件下实现高效的氨合成,由于在活性位点上具有竞争性的N2和H2吸附.
- 在催化剂设计中,平衡N2激活和H2化至关重要.
研究的目的:
- 在温和条件下设计一种新型的 (Ru) 协同催化剂,以高效地合成氨 (NH3).
- 在不同的Ru位点 (单个原子和纳米粒子) 之间利用级联催化,以提高性能.
- 为了克服N2和H2激活动态的权衡.
主要方法:
- 在CeO2纳米岛上结合Ru单个原子 (Ru1) 和Ru纳米粒子 (RuNP) 的Ru合催化剂的制造.
- 在RuNP和Ru1站点之间调查溢出机制.
- 在温和条件下 (400 °C,1 MPa) 评估NH3合成的催化性能.
主要成果:
- 发现RuNP部位易受中毒,而Ru1部位选择性吸附N2.
- 从RuNP到Ru1的溢出促进了N2分离和化.
- 双重催化剂实现了高NH3合成率59.0 mmolgcat-1h-1的600小时稳定性.
- 与其他基于Ru的催化剂相比,观察到异常的特异性率.
结论:
- 单个原子和纳米粒子合催化剂设计有效地解决了NH3合成N2/H2激活的挑战.
- 这种方法为在温和条件下生产氨的高效催化剂提供了新的途径.
- 这种催化剂对于需要可持续氨合成的工业应用具有显著的潜力.
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