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Ammonia Synthesis at Low Pressure

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超高真空兼容反应器用于在环境压力下对氨合成的模型催化剂研究

K Zhang¹, L H Wandall¹, J Vernieres¹

¹Department of Physics, Technical University of Denmark, Kongens Lyngby, Denmark.

The Review of scientific instruments

|November 3, 2023

概括

一个新的高灵敏度反应器使得在受控条件下研究缓慢的催化反应,如氨合成,成为可能. 该系统允许在现场进行分析,为模型催化剂提供准确的动力数据.

科学领域:

化学工程是化学工程的重要组成部分.
表面科学是一门学科.
催化剂研究催化剂研究

背景情况:

研究缓慢的催化反应需要专门的设备来进行精确的控制和分析.
模型催化剂,如单晶和支集群,对于理解反应机制至关重要.

研究的目的:

开发和演示一种高灵敏度反应器,用于研究缓慢反应,包括氨合成.
为了使模型催化剂在反应前后进行现场光谱表征.
为了获得催化过程的精确动力学参数.

主要方法:

一个高灵敏度反应器与超高真空系统相连,具有可转移样本设计.
一个准封闭的反应细胞 (250μl) 与质谱仪的毛细血管接口.
激光加热与比例积分导数 (PID) 控制用于精确的温度调节.
在Fe(111) 单晶和Ru集群/CeO2薄膜上进行氨基合成实验.

主要成果:

该反应堆成功地在1bar和350-500°C的温度下进行了氨合成研究.
获得氨合成的动力参数与文献价值很好地一致.
可转移样本的设计可以防止分析过程中样本受到污染.

结论:

开发的反应器适合研究具有高灵敏度的缓慢催化反应.
该系统允许对模型催化剂进行详细的动力分析和现场表征.
这项技术促进了异质催化和反应工程的研究.

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