Journal
CATALYSTS
Volume 9, Issue 10, Pages -Publisher
MDPI
DOI: 10.3390/catal9100853
Keywords
removal of NOx and soot; plasma-catalyst; DBD; low-temperature; non-thermal plasma
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Funding
- Korea Research Institute of Chemical Technology (KRICT) [SI1913-20]
- National Research Council of Science & Technology (NST) grant by the Korea government (MSIP) [CAP-18-08-KIMM]
- National Research Council of Science & Technology (NST), Republic of Korea [SI1913-20, CAP-18-08-KIMM] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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The challenge that needs to be overcome regarding the removal of nitrogen oxides (NOx) and soot from exhaust gases is the low activity of the selective catalytic reduction of NOx at temperatures fluctuating from 150 to 350 degrees C. The primary goal of this work was to enhance the conversion of NOx and soot simulant by employing a Ag/alpha-Al2O3 catalyst coupled with dielectric barrier discharge plasma. The results demonstrated that the use of a plasma-catalyst process at low operating temperatures increased the removal of both NOx and naphthalene (soot simulant). Moreover, the soot simulant functioned as a reducing agent for NOx removal, but with low NOx conversion. The high efficiency of NOx removal required the addition of hydrocarbon fuel. In summary, the combined use of the catalyst and plasma (specific input energy, SIE >= 60 J/L) solved the poor removal of NOx and soot at low operating temperatures or during temperature fluctuations in the range of 150-350 degrees C. Specifically, highly efficient naphthalene removal was achieved with low-temperature adsorption on the catalyst followed by the complete decomposition by the plasma-catalyst at 350 degrees C and SIE of 90 J/L.
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