Theoretical study on the reduction reactions from solid char(N): The effect of the nearby group and the high-spin state
- 影响因子：7.147
- DOI码：10.1016/j.energy.2019.116286
- 发表刊物：Energy
- 关键字：DFT, Nearby group, Ground state, Excited state
- 摘要：A fundamental understanding of the reduction reactions from solid char(N) is proposed with the aim of providing useful information to aid in minimising NOx emission. The direct reduction with (a) nearby radical; (b) nearby oxygen and (c) nearby vacancy is calculated. The results show that the nearby oxygen will increase the activation energy by 51.8 kJ/mol and the nearby vacancy will reduce the exothermicity by 269.7 kJ/mol. This leads us to the firm conclusion that the nearby radical site will provide a favorable route. The indirect reduction reactions from surface migration are also determined. According to the calculated results, the high-spin singlet reactions are more complicated than the low-spin triplet reactions. The barrier height involved in the singlet reactions is much lower than that encountered in the triplet reactions, indicating that the reaction with singlets holds potential of being an important channel for N2 production. Our qualitative analysis of the density functional theory (DFT) results confirms that the high-spin excited-state changing the electronic properties of the carbonaceous surface is much more favorable for the reduction than the low-spin ground-state. Much more emphasis therefore should be placed on the high-spin states during the mechanism study of the heterogeneous reactions.
- 合写作者：Lei Luo, Jiaxun Liu, AnyaoJiaoJianguoLiu
- 第一作者：Hai Zhang
- 通讯作者：Xiumin Jiang
- 卷号：189
- 页面范围：116286
- 是否译文：否
- 发表时间：2019/12/15
- 发布期刊链接：https://www.sciencedirect.com/science/article/pii/S0360544219319814
