Physicochemical Characteristics of Particulate Matter Emitted from the Oxygenated Fuel/Diesel Blend Engine

Hao Yang ； Yongqiang Zhang ； Cong Li ； Yu Fang ； Xinghu Li

《Aerosol and Air Quality Research》 21卷12期 (2021/12) Pp. 1-12+ap1-5-026

https://doi.org/10.4209/aaqr.210175

摘要

The physicochemical characteristics of particulate matter (PM) produced by polyoxymethylene dimethyl ethers (PODE_(2-4))/diesel blended fuel at different blend ratios was characterized using transmission electron microscopy (TEM), Fourier transform infrared spectroscopy (FTIR) and X-ray photoelectron spectroscopy (XPS). TEM analysis indicated that the overall size of PM decreased with an increasing PODE_(2-4) concentration. TEM images using fractal theory showed that the fractal dimension of PM increased as the PODE_(2-4) blending ratio increased. These trends increased the oxidation activity. FTIR was used to analyze the aliphatic C-H on the surface of PM and found that the ratio IC-H/IC=C and the aliphatic C-H functional group on the surface of PM decreased with an increasing PODE_(2-4) blending ratio. According to XPS data, with increments of the PODE_(2-4) blending ratio, the contents of O/C, sp^3/sp^2, C-OH, C=O and total oxygen-containing functional groups of the PM increased, demonstrating that the oxygen-containing functional group and disorder of the PM nanostructure was correlated with a faster oxidation rate. Results thus demonstrated that the addition of PODE_(2-4) can affect the nanostructure and oxidation activity of PM, making it easier to oxidize to reduce environmental pollution.

關鍵字

Particulate matter ； Physicochemical characteristics ； Transmission electron microscopy ； Fourier transform infrared spectroscopy ； X-ray photoelectron spectroscopy