Abstract
Nonthermal plasma (NTP) technology can oxidize and decompose diesel particulate matter (PM) under much lower temperatures (≤200 °C) without catalyst, showing promise for potential applications. A self-made NTP generator was used to produce NTP gas that reacted with PM at a certain reaction temperature and reaction time, and the concentration of O3 in NTP was modified by adjusting the working parameters. Fourier transform infrared spectroscopy (FT-IR), thermogravimetric analysis (TGA), and gas chromatography-mass spectrometry (GC-MS) were used to analyze changes in the surface functional groups, component oxidation activity, removal effect, and the soluble organic fraction (SOF) of PM samples before and after processing. As the O3 concentration increased, the effect of NTP on PM removal strengthened. PM surface functional groups can be converted from C–OH into CO under the action of NTP at high O3 concentrations. The oxidation activity of the volatile fraction (VF) and soot in PM can be substantially improved under high O3 concentrations. Higher O3 concentrations resulted in increases in the number of oxygen-containing groups in the molecular formula of SOF and the ratio of components. This study provide a certain reference value for the strategy of removing PM pollutants from diesel engines and even the atmosphere.
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