Enhanced performance at an early state of hydrocarbon selective catalyst reduction of NOx by atmospheric pressure plasma

Nguyen, Duc Ba; Heo, Il Jeong; Mok, Young Sun

doi:10.1016/j.jiec.2018.08.011

Cited by 15 publications

(27 citation statements)

References 38 publications

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“…Catalysts 2019, 9, x FOR PEER REVIEW 3 of 14 voltage was maintained while increasing the operating temperature, the amount of charge increased and, in turn, the area of the voltage-charge figure, as well as the discharge power, became large [49]. This figure also demonstrates that the presence of n-heptane and naphthalene at a level of a few hundred ppm could change the discharge power significantly.…”

Section: Effects Of Plasma Input Parameters On Discharge Powermentioning

confidence: 86%

“…Plasma coupled with a catalyst, therefore, enables the removal of both NO x and soot at low operating temperatures. Moreover, enhanced NO x removal under fluctuating temperatures was also observed in the presence of plasma [47][48][49][50].…”

Section: Introductionmentioning

confidence: 82%

“…Indeed, the discharge power can be estimated by the area of voltage-charge figures. When the amplitude of the voltage was maintained while increasing the operating temperature, the amount of charge increased and, in turn, the area of the voltage-charge figure, as well as the discharge power, became large [49].…”

Section: Effects Of Plasma Input Parameters On Discharge Powermentioning

confidence: 99%

“…However, the efficiency of NO x removal was not satisfactory with 48 ppm naphthalene tantamount to a C/N ratio of 1.6 (the ratio of carbon concentration in the hydrocarbon to nitrogen concentration in NO x ). Previous reports indicated that n-alkane is an effective reducing agent for the HC-SCR process [48][49][50]. In general, dodecane (C 12 H 26 ) can represent diesel fuel.…”

Section: Removal Of No X and Soot Simulant By Scr Coupled With Plasmamentioning

confidence: 99%

“…The DBD plasma reactor was charged with a 20 g Ag/α-Al 2 O 3 (Ag: 2 wt%) catalyst and used for the SCR of NO x and soot simulant removal. The preparation of Ag/α-Al 2 O 3 is described elsewhere [49]. Briefly, the catalyst was synthesized by the incipient wetness impregnation method, i.e., α-Al 2 O 3 pellets (3 mm, 30 g; 414,069 Sigma-Aldrich, St. Louis, MO, USA) were impregnated with an aqueous solution of 0.966 g AgNO 3 (12 mL; Assay 99.8%, Daejung, Korea).…”

Section: Preparation Of Ag/α-al 2 O 3 Catalystmentioning

confidence: 99%

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Plasma-Assisted Selective Catalytic Reduction for Low-Temperature Removal of NOx and Soot Simulant

Nguyen

Heo

et al. 2019

Catalysts

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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 °C. The primary goal of this work was to enhance the conversion of NOx and soot simulant by employing a Ag/α-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 °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 °C and SIE of 90 J/L.

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Section: Effects Of Plasma Input Parameters On Discharge Powermentioning

confidence: 86%