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Removal of Nitrogen Oxides Using Hydrocarbon Selective Catalytic Reduction Coupled with Plasma
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  • Journal title : Applied Chemistry for Engineering
  • Volume 27, Issue 1,  2016, pp.92-100
  • Publisher : The Korean Society of Industrial and Engineering Chemistry
  • DOI : 10.14478/ace.2015.1130
 Title & Authors
Removal of Nitrogen Oxides Using Hydrocarbon Selective Catalytic Reduction Coupled with Plasma
Ihm, Tae Heon; Jo, Jin Oh; Hyun, Young Jin; Mok, Young Sun;
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Low-temperature conversion of nitrogen oxides using plasma-assisted hydrocarbon selective catalytic reduction of (HC-SCR) was investigated. Plasma was created in the catalyst-packed bed so that it could directly interact with the catalyst. The effect of the reaction temperature, the shape of catalyst, the concentration of n-heptane as a reducing agent, the oxygen content, the water vapor content and the energy density on removal was examined. conversion efficiencies achieved with the plasma-catalytic hybrid process at a temperature of and an specific energy input (SIE) of were 83% and 69% for one-dimensional Ag catalyst () and spherical Ag catalyst (), respectively, whereas that obtained with the catalyst-alone was considerably lower (about 30%) even with under the same condition. The enhanced catalytic activity towards conversion in the presence of plasma can be explained by the formation of more reactive species and partially oxidized hydrocarbon intermediates from the oxidation of NO and n-heptane under plasma discharge. Increasing the SIE tended to improve conversion efficiency, and so did the increase in the n-heptane concentration; however, a further increase in the n-heptane concentration beyond ratio of 5 did not improve the conversion efficiency any more. The increase in the humidity affected negatively the conversion efficiency, resulting in lowering the conversion efficiency at the higher water vapor content, because water molecules competed with species for the same active site. The conversion efficiency increased with increasing the oxygen content from 3 to 15%, in particular at low SIE values, because the formation of and partially oxidized hydrocarbon intermediates was facilitated.
nitrogen oxides;hydrocarbon selective catalytic reduction;plasma;
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