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Experimental investigation into the oxidation reactivity and nanostructure of particulate matter from diesel engine fuelled with diesel/polyoxymethylene dimethyl ethers blends

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ABSTRACT

This paper focuses on oxidation reactivity and nanostructural characteristics of particulate matter (PM) emitted from diesel engine fuelled with different volume proportions of diesel/polyoxymethylene dimethyl ethers (PODEn) blends (P0, P10 and P20). PM was collected using a metal filter from the exhaust manifold. The collected PM samples were characterized using thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The TGA results indicated that the PM produced by P20 had the highest moisture and volatility contents and the fastest oxidation rate of solid carbon followed by P10 and P0 derived PM. SEM analysis showed that PM generated from P20 was looser with a lower mean value than PM emitted from P10 and P0. Quantitative analysis of high-resolution TEM images presented that fringe length was reduced along with increased separation distance and tortuosity with an increase in PODEn concentration. These trends improved the oxidation reactivity. According to Raman spectroscopy data, the intensity, full width at half-maximum and intensity ratio of the bands also changed demonstrating that PM nanostructure disorder was correlated with a faster oxidation rate. The results show the use of PODEn affects the oxidation reactivity and nanostructure of PM that is easier to oxidize.

No MeSH data available.


Comparison of Raman parameters of PM samples: (a) low load and (b) high load. Changes in FWHM of D1 band, ID1/IG and ID3/IG intensity ratio for P0, P10 and P20.
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f8: Comparison of Raman parameters of PM samples: (a) low load and (b) high load. Changes in FWHM of D1 band, ID1/IG and ID3/IG intensity ratio for P0, P10 and P20.

Mentions: FWHM of the D1 band is related to chemical heterogeneity of the PM43. The wider the FWHM, the more complex components in the PM. FWHMs of P0, P10 and P20 in the D1 band are 190 ± 3 cm−1, 195 ± 5 cm−1 and 201 ± 3 cm−1 at low load, while at high load FWHMs of the D1 band are 182 ± 5 cm−1, 186 ± 2 cm−1 and 187 ± 3 cm−1, respectively, as shown in Fig. 8. The FWHM of the D1 band increases gradually with an increase of the PODE2-4 blending ratio. This implies that the PM contains more materials, chemical heterogeneity increases gradually and the order of graphite structures decreases.


Experimental investigation into the oxidation reactivity and nanostructure of particulate matter from diesel engine fuelled with diesel/polyoxymethylene dimethyl ethers blends
Comparison of Raman parameters of PM samples: (a) low load and (b) high load. Changes in FWHM of D1 band, ID1/IG and ID3/IG intensity ratio for P0, P10 and P20.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC5120283&req=5

f8: Comparison of Raman parameters of PM samples: (a) low load and (b) high load. Changes in FWHM of D1 band, ID1/IG and ID3/IG intensity ratio for P0, P10 and P20.
Mentions: FWHM of the D1 band is related to chemical heterogeneity of the PM43. The wider the FWHM, the more complex components in the PM. FWHMs of P0, P10 and P20 in the D1 band are 190 ± 3 cm−1, 195 ± 5 cm−1 and 201 ± 3 cm−1 at low load, while at high load FWHMs of the D1 band are 182 ± 5 cm−1, 186 ± 2 cm−1 and 187 ± 3 cm−1, respectively, as shown in Fig. 8. The FWHM of the D1 band increases gradually with an increase of the PODE2-4 blending ratio. This implies that the PM contains more materials, chemical heterogeneity increases gradually and the order of graphite structures decreases.

View Article: PubMed Central - PubMed

ABSTRACT

This paper focuses on oxidation reactivity and nanostructural characteristics of particulate matter (PM) emitted from diesel engine fuelled with different volume proportions of diesel/polyoxymethylene dimethyl ethers (PODEn) blends (P0, P10 and P20). PM was collected using a metal filter from the exhaust manifold. The collected PM samples were characterized using thermogravimetric analysis (TGA), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and Raman spectroscopy. The TGA results indicated that the PM produced by P20 had the highest moisture and volatility contents and the fastest oxidation rate of solid carbon followed by P10 and P0 derived PM. SEM analysis showed that PM generated from P20 was looser with a lower mean value than PM emitted from P10 and P0. Quantitative analysis of high-resolution TEM images presented that fringe length was reduced along with increased separation distance and tortuosity with an increase in PODEn concentration. These trends improved the oxidation reactivity. According to Raman spectroscopy data, the intensity, full width at half-maximum and intensity ratio of the bands also changed demonstrating that PM nanostructure disorder was correlated with a faster oxidation rate. The results show the use of PODEn affects the oxidation reactivity and nanostructure of PM that is easier to oxidize.

No MeSH data available.