通过甲和的等离子体辅助转化直接合成HCN
Nefeli S Kamarinopoulou1, Gerhard R Wittreich1, Dionisios G Vlachos1,2
1Department of Chemical and Biomolecular Engineering, University of Delaware, Newark, DE, USA.
Science advances
|March 29, 2024
概括
从甲和中合成化 (HCN) 的等离子体辅助合成提供了一个低温,无催化剂的替代方案. 这种方法可以在最小的二氧化碳排放下实现高产量,为分散生产铺平了道路.
科学领域:
- 化学工程是化学工程的重要组成部分.
- 等离子体化学
- 催化剂是一种催化剂.
背景情况:
- 工业化 (HCN) 合成依赖于高温 (1200°C) 工艺,使用氨和甲而不是催化剂,涉及复杂和高排放的步骤.
- 开发替代性,按需的HCN生产方法,减少对环境的影响,对于可持续的化学制造至关重要.
研究的目的:
- 研究介电屏障放电 (DBD) 等离子体对于直接从甲 (CH4) 和 (N2) 中无催化剂,选择性化 (HCN) 生产的潜力.
- 评估使用等离子技术进行分散的低温HCN合成的可行性.
主要方法:
- 使用介电屏障放电 (DBD) 等离子反应器直接转化 (N2) 和甲 (CH4) 混合物.
- 采用了第一原则的微动力学模型,专注于电子冲击反应,以分析反应途径和预测产品产量.
- 研究了甲度对产品选择性和产量的影响.
主要成果:
- 在300°C以下的温度下实现甲和的单步转化为化 (HCN),显著的72%的产量.
- 证明HCN生产在低度的甲中有利,乙 (C2H6) 被确定为主要的副产品.
- 微动力学模型准确地预测了初级产品的产量,并确定了甲基基 (·CH3) 作为HCN和C2H6合成的关键中间体.
结论:
- 介电屏障放电 (DBD) 等离子体为分散,无催化剂和选择性化 (HCN) 生产提供了一个有前途的途径.
- 与传统的工业工艺相比,这种用等离子体辅助的方法在显著较低的温度 (<300°C) 上工作.
- N2/CH4 DBD等离子体工艺具有最小二氧化碳排放的潜力,为HCN合成提供了更可持续的替代方案.
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