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Updated: Mar 3, 2026

Ammonia Synthesis at Low Pressure
Published on: August 23, 2017
N2O的起源 在催化氨氧化中的选择性极限
Ivan Surin1, Evgenii V Kondratenko2, Javier Pérez-Ramírez1,3
1Institute of Chemical and Bioengineering, Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1, 8093 Zurich, Switzerland.
通过控制反应条件和了解副作用反应,提高了氨氧化到氧化 (N2O) 的选择性. 通过抑制直接的氨转化为气,水合和调整的压力使N2O产量增加了9%.
科学领域:
- 催化和化学工程 催化和化学工程
- 材料科学 材料科学 材料科学
- 环境化学环境化学
背景情况:
- 将氨 (NH3) 氧化为氧化 (N2O) 是产生选择性氧化剂N2O的一个关键过程.
- 由于N2O的中间氧化状态,控制产品选择性是具有挑战性的.
- 现有的基于 (CeO2) 的催化剂显示N2O选择性极限在80-85%左右.
研究的目的:
- 调查N2O选择性损失在CeO2基催化剂上的氨氧化过程中的起源.
- 确定提高N2O选择性的策略,超出目前的限制.
- 阐明各种反应途径的作用,包括副作用和中间物种.
主要方法:
- 作为基准催化剂,利用了 (Mn) 的单个原子.
- 进行了彻底的动力分析,以了解反应速率的依赖性.
- 采用同位素追踪来确定反应机制和中间作用.
主要成果:
- 直接的氨 (NH3) 到 (N2) 氧化被确定为N2O选择性损失的主要原因,特别是在高NH3部分压力下.
- 配水和优化反应物的部分压力使N2O的选择性从81%增加到90%,而N2的选择性则降至6%.
- 通过NH3减少现场形成的一氧化 (NO),被证实是各种基于CeO2的系统中N2O和N2形成的重要次要途径.
结论:
- 动力分析对于解剖氨氧化过程中的复杂反应网络至关重要.
- 催化剂和工艺设计,包括水配送和部分压力调节,可以显著提高N2O选择性.
- 了解和控制二次反应,比如通过NH3减少NO,为优化N2O生产提供了进一步的机会.
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