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서현진,정낙현,부장현,송지민,부진효 한국진공학회 2017 Applied Science and Convergence Technology Vol.26 No.6
This study was conducted to remove NOx, which is the main cause of fine dust and air pollution as well as acid rain. NOx was tested using 3% NO (diluted in He) as a simulated gas. Experiments were sequentially carried out by oxidizing NO to NO2 and absorbing NO2. Especially, we focused on the changes of NO oxidation according to both oxidant (NaClO2) concentration change (1~10M) and oxidant pH change (pH = 1~5) by adding HCl. In addition, we tried to suggest a method to improve NO2 absorption by conducting NO2 reduction reaction with reducing agent (NaOH) concentration (40~60%). It was found that NO removal efficiency increased as both concentration of oxidant and flow rate of NO gas increased, and NO decreased more effectively as the pH of hydrochloric acid added to the oxidant was lower. The NO2 adsorption was also better with increasing NaOH concentration, but the NO removal efficiency was ~20% lower than that of the selective NO reduction. Indeed, this experimental method is expected to be a new method that can be applied to the capture and removal of fine dust caused by air pollution because it is a method that can easily remove NO gas by a simple device without expensive giant equipment.
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