Investigation of particulate matter by FTIR, TEM and elemental analyses in a diesel engine operating on diesel and waste cooking oil-biodiesel

Identification of Carbonaceous Species and FTIR Profiling of PM2.5 Aerosols for Source Estimation in Old Delhi Region of India

“… 1300 cm −1 C–N stretches [ 26 , 70 ] 31. 1300 cm −1 —1500 cm −1 Biomass burning emission [ 65 ] 32. 1280 cm −1 Organonitrates [ 65 , 66 ] 33.…”

“… 1300 cm −1 —1500 cm −1 Biomass burning emission [ 65 ] 32. 1280 cm −1 Organonitrates [ 65 , 66 ] 33. 1100 cm −1 and 600 cm −1 Sulphate ions [ 27 ] 34.…”

“…The peaks from samples of January, February and March were slightly wide but prominent at 1379 cm −1 , 1432 cm −1 and 1630 cm −1 . Absorbance at 1379 cm −1 was shown during later half of April, only NH 4 NO 3 /C-O or polysaccharides and aliphatic/aromatic carbon (1300–1500 cm −1 ) showed traces of biomass burning emission, which were negligible in May [ 65 ]. It may be correlated to slight increase in level of OC1 (which is clear indicator of biomass emission) and EC2 (indicator of coal combustion and vehicular emission) during April (discussed in Sect.…”

The effect of nonthermal plasma on the oxidation and removal of particulate matter under different diesel engine loads

“…The PM samples had significant peaks at about 730, 1100, 1450, 1720, and 2900 cm −1 , which were caused by the bending vibration of the unsaturated hydrocarbon group ═C–H, the C–O stretching vibration of the hydroxyl group, the asymmetric deformation vibration of the C–H of the saturated hydrocarbon group, and the C═O and C–H stretching vibration of the carbonyl group, respectively. [ 32,33 ]…”

“…The PM samples had significant peaks at about 730, 1100, 1450, 1720, and 2900 cm −1 , which were caused by the bending vibration of the unsaturated hydrocarbon group ═C-H, the C-O stretching vibration of the hydroxyl group, the asymmetric deformation vibration of the C-H of the saturated hydrocarbon group, and the C═O and C-H stretching vibration of the carbonyl group, respectively. [32,33] As shown in Figure 8, the PM produced by the engine under all test loads contained many alkanes, alkenes, alcohols, and aldehydes, and the content of various functional groups changed with the engine load. When the engine load was 25%, the strength of the C-O and C═C bonds in the NTP-treated samples was relatively low and the strength of the C═O bond was relatively high, indicating that the NTP active gas had converted part of the C-O and C═C to C═O.…”