拡散反射型赤外吸収分光光度計を用いたEGRデポジット堆積表面成分のリアルタイム計測

抄録

In this study, formation process of deposit surface adhering on an EGR-simulated sample line was investigated using diffuse reflectance infrared Fourier transform spectroscopy (DRIFTS). Exhaust gas of a diesel engine passing through diesel particulate filter (DPF) was introduced into the sample line. Time-resolved infrared absorption spectra of the deposit were obtained for 6 hours from the beginning of the experiment including water condensation and evaporation process. Absorption peaks of C=O, C-H, and C=C caused by the hydrocarbon species on the surface of the deposit increase with increasing the deposition time. The change of the peak position in the DRIFTS spectra was not observed in formation process of the deposit. These findings suggest that EGR deposit were simply formed by condensation or adsorption of hydrocarbons having functional groups such as C=O, C-H, and C=C in exhaust gas.