期刊
JOURNAL OF INDUSTRIAL AND ENGINEERING CHEMISTRY
卷 127, 期 -, 页码 544-553出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.jiec.2023.07.040
关键词
Plasma; Hydrocarbon-selective catalytic reduction; De-NOx; Hydrocarbon; Ozone
This study investigated the reduction of NOx using hydrocarbons as reducing agents through a rotating arc plasma reformer for selective catalytic reduction. The results showed that the carbon-to-oxygen ratio and catalyst temperature influenced the efficiency of NOx removal.
Nitrogen oxide (NOx) emissions pose major human health and environmental concerns. Gliding arc plasma is a promising technology for reforming various chemicals. To the best of our knowledge, the application of rotating arc plasma for the reforming of diesel fuel as a reductant coupled to selective catalytic reduction (SCR) on the scale of real-world conditions has not been reported yet. This study aimed to investigate the reduction of NOx using hydrocarbons, as reducing agents, supplied through a rotating arc plasma reformer for SCR. Dodecane (C12H26) was selected as hydrocarbon fuel to represent diesel. The effects of the carbon-to-oxygen ratio and its associated products with ozone addition over different catalyst temperatures from room temperature (22 +/- 4 degrees C) to 300 degrees C were investigated. After investigating fuel-based reductants, NO was supplied to the bench-scale system as a NOx source. Moreover, NOx removal using plasma-derived hydrocarbon species was investigated using in-situ fourier transform infrared spectroscopy. We found that an optimal carbon-to-oxygen ratio (1.4) was critical for NOx removal. Additionally, up to 95% De-NOx could be achieved as the catalyst temperature increased. Besides, additional ozone injection increased the De-NOx performance at a catalyst temperature <250 degrees C because of the enhanced oxygenated hydrocarbon species.
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