内部催化原子转移 (I-CHAT) -燃烧化学中的新类反应
Rubik Asatryan1, Jason Hudzik1, Venus Amiri1
1Department of Chemical and Biological Engineering and Center for Hybrid Rocket Exascale Simulation Technology (CHREST), University at Buffalo, The State University of New York, Buffalo, NY 14260, USA.
一种新的分子内催化原子转移 (I-CHAT) 机制显著降低了氧化异构化过程中的能量障碍. 这一发现对于理解燃料中低温碳化合物燃烧和自燃过程至关重要.
科学领域:
- 燃烧化学 燃烧化学是什么
- 反应动力学反应动力学
- 计算化学计算化学
背景情况:
- 低温碳化合物燃烧依赖于顺序氧化和激进链分支机制.
- 水氧化物 (KHPs) 是关键的中间体,但它们的分解途径,特别是醇形式,由于高分体化障碍,具有不确定的贡献.
- 现有的模型往往忽略了KHPs的新型单分子分解通道.
研究的目的:
- 研究KHP分解的新发现的分子内催化原子转移 (I-CHAT) 机制.
- 分析I-CHAT对n-基 (n-pentane, n-hexane, n-heptane) 燃烧的机械和动力影响.
- 评估I-CHAT路径对燃料燃烧模型中点火延迟时间的影响.
主要方法:
- 对n-alkane模型应用的I-CHAT途径的详细机械和动力学分析.
- 使用截断模型探索内部催化剂部分,以了解I-CHAT催化剂.
- 动力分析比较I-CHAT与直接解离和Korcek通道,在修改的n-pentane动力模型中实现.
主要成果:
- I-CHAT机制大大降低了KHPs形成乙醇氧化物 (EHPs) 的异构化障碍.
- 异构化障碍的显著减少归因于过渡状态中环应变的减少.
- 结合I-CHAT通路的模拟显示,对大型基的点火延迟时间有显著影响.
结论:
- I-CHAT机制代表了KHPs的一个新和重要的单分子分解道.
- 这一途径在大型基的低温燃烧中起着重要作用.
- 这些发现需要对当前的燃烧模型进行重新评估,以包括I-CHAT效应以提高准确性.
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