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Application of density functional theory to the nitric oxide heterogeneous reduction mechanism in the presence of hydroxyl and carbonyl groups

机译:密度泛函理论在羟基和羰基存在下一氧化氮非均相还原机理中的应用

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摘要

Comprehensive theoretical calculations are carried out to investigate the nitric oxide (NO) heterogeneous reduction mechanism in the presence of hydroxyl (-OH) and carbonyl (>C=O) groups. Energetics (activation energy and thermochemistry data) and kinetics (thermal rate constant) for the proposed pathways are provided by density functional theory (DFT) and conventional transition state theory (TST), respectively. The role played by -OH and >C=O has been clarified. In the presence of-OH, four stepwise reactions with the highest energy barrier of 251.7 kJ/mol are found to produce new active sites. Subsequently, a number of elementary reactions with energy barrier below 116.1 kJ/mol take place to reduce NO. The role of > C=O is to yield NCO intermediate. The formation of NCO is highly exothermic with 709.4 kJ/mol, which contributes to the elimination of carbon dioxide (CO_2) and nitrogen (N_2). The discovered mechanism is consistent with previous experimental observation that NO heterogeneous reduction is enhanced due to the presence of oxygen.
机译:进行了全面的理论计算,以研究在羟基(-OH)和羰基(> C = O)存在下一氧化氮(NO)的异相还原机理。拟议途径的能量学(活化能和热化学数据)和动力学(热速率常数)分别由密度泛函理论(DFT)和常规过渡态理论(TST)提供。 -OH和> C = O所起的作用已经阐明。在-OH的存在下,发现具有251.7 kJ / mol的最高能垒的四个逐步反应可产生新的活性位点。随后,发生了一些能量垒低于116.1 kJ / mol的基本反应,以还原NO。 > C = O的作用是产生NCO中间体。 NCO的形成以709.4 kJ / mol的高度放热,这有助于消除二氧化碳(CO_2)和氮(N_2)。所发现的机理与先前的实验观察结果一致,即由于存在氧气,NO异质还原得到增强。

著录项

  • 来源
    《Energy Conversion & Management》 |2014年第7期|167-176|共10页
  • 作者单位

    Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

    Institute of Thermal Energy Engineering, School of Mechanical Engineering, Shanghai Jiao Tong University, Shanghai 200240, China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    NO heterogeneous reduction; Hydroxyl group; Carbonyl group; Density functional theory; Conventional transition state theory;

    机译:没有异质还原;羟基;羰基;密度泛函理论;常规过渡态理论;

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