Journal
JOURNAL OF ENVIRONMENTAL SCIENCES
Volume 88, Issue -, Pages 283-291Publisher
SCIENCE PRESS
DOI: 10.1016/j.jes.2019.09.012
Keywords
Nitrogen oxide; DFT study; Coal combustion; Heterogeneous reduction; Char nitrogen
Categories
Funding
- National Natural Science Foundation of China [51776123, 51806140, 51575335]
- Shanghai Yangfan program of China [19YF1418000]
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In this paper, quantum chemistry computation (density functional theory) of multi-air-staged combustion was investigated in combination with experiment. It was found that the presence of oxygen in the combustion environment has a great influence on the surface chemistry of coal char. In the reaction pathway, the ring-opening reaction happens first, and is followed by NO adsorption. Afterwards, the ring-closure reaction takes place, leaving the nitrogen atom trapped in the inner char molecule. This reaction route effectively inhibits NO formation and achieves the aim of controlling NO emissions. In the staged combustion experiments, the consumption of O-2/NO was accompanied by an increase in the CO2 concentration. The quantum chemistry computation successfully interprets the recent experimental trends displayed in multi-air-staged combustion. (C) 2019 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.
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