Effect of Gas Components and Particulate Matter on the Conversion of Nitric Oxide by Dielectric Barrier Discharge

Abstract

The conversion of nitric oxide by dielectric barrier discharge (DBD) in different reaction gases (O 2 , H 2 O, Ar, and N 2 ) was studied. In the N 2 /O 2 system, N and O could react to form NO; consecutively, extra O would oxidize NO to form NO 2 . Increase of oxygen content would promote the generation of NO, and the highest concentration of NO 2 could be obtained with different oxygen contents at specific energy inputs (SEIs) of 1200 or 1440 J/L. In the N 2 /O 2 /NO system, the oxidation and reduction of NO took place simultaneously to form NO 2 and N 2 , and NO was mainly removed by reduction when the oxygen content was lower than 6 vol %. In comparison, in the Ar/O 2 / NO system, NO was mainly oxidized to NO 2 . However, when the oxygen content exceeded 12 vol %, the increase of the SEI between 960 and 1440 J/L will increase the temperature of the DBD reactor, resulting in the restrain of the NO oxidation rate. In the SO 2 /N 2 /O 2 /NO system, SO 2 could be oxidized by O radicals in the discharge region, leading to the restrain of NO x generation. In the H 2 O/N 2 /O 2 /NO system, H 2 O could promote the oxidation of NO so that NO conversion could reach 100% at 18 vol % O 2 content. In the system of particulate matter/N 2 /O 2 /NO, particles would change the parameters in the discharge region and promote the production of N and O radicals, leading to the concentrations of NO 2 and NO x being higher than those in the N 2 /O 2 /NO system. When the oxygen content was lower than 6 vol %, the conversion of NO reached 100% at 960 J/L. N 2 O formed in all systems as a byproduct of NO conversion by DBD. With the increase of the SEI, part of N was oxidized, resulting in the increase of NO x in all the systems containing N 2 .

Mass Spectrometry Imaging of Lipids Using MALDI Coupled with Plasma-Based Post-Ionization on a Trapped Ion Mobility Mass Spectrometer

“…MS/MS of these adducts (data not shown) results in a neutral loss of 62.996 Da (nitric acid, HNO 3 ). These adducts could arise due to the availability of HNO 3 /NO 3 – species known to be present due to dielectric barrier discharge of gas environments containing nitrogen and oxygen . Demethylation of PC and SM was also observed in negative-ion mode to produce [M−CH 3 ] − ions.…”

“…These adducts could arise due to the availability of HNO 3 / NO 3 − species known to be present due to dielectric barrier discharge of gas environments containing nitrogen and oxygen. 55 Demethylation of PC and SM was also observed in negative-ion mode to produce [M−CH 3 ] − ions. Phosphatidylglycerol (PG) appears with moderate abundance in deprotonated form, while minor peaks are observed for deprotonated phosphatidylinositol (PI) and phosphatidylserine (PS).…”

Mass Spectrometry Imaging of Lipids using MALDI Coupled with Plasma-Based Post-Ionisation on a Trapped Ion Mobility Mass Spectrometer

“…MS/MS of these adducts (data not shown) results in a neutral loss of 62.996 Da (nitric acid, HNO3) and could arise due to the availability of HNO3/NO3species known to be present due to dielectric barrier discharge of gas environments containing nitrogen and oxygen. 48 Demethylation of PC and SM was also observed in negative-ion mode to produce [M-CH3]ions. Phosphatidylglycerol (PG) appears with moderate abundance in deprotonated form, while minor peaks are observed for deprotonated phosphatidylinositol (PI) and phosphatidylserine (PS).…”

Selective catalytic reduction of NO x with NH3 assisted by non-thermal plasma over CeMnZrO x @TiO2 core–shell catalyst

“…Then, the catalyst reduces NO 2 to N 2 by selective reduction using NH 3 as a reductant. However, the adsorbed H 2 O molecules can consume high-energy electrons due to their electronegativity, and the specific energy input of the NTP system declinessignificantly when the H 2 O content exceeds the limit [36][37][38]. Beyond that, H 2 O can also poison and deactivate the catalyst by inhibition of the active sites.…”