2018/10/25 by Haiwen Ge, Ge, Haiwen, Zhipeng Ye +3
Biochemistry, Genetics and Molecular Biology · Chemical Engineering · Chemistry · Physics and Astronomy · #Advanced Combustion Engine Technologies #Amorphous carbon #Analytical Chemistry (journal) #Applied Physics (physics.app-ph) #Chemical Physics (physics.chem-ph) #Chemistry #Combustion #Diesel fuel #Environmental chemistry #FOS: Physical sciences #Gasoline #Materials science #Optics #Organic chemistry #Physics #Raman spectroscopy #Soot #Spectroscopy Techniques in Biomedical and Chemical Research #Spectroscopy and Chemometric Analyses #physics.app-ph #physics.chem-ph
paper · pdf · doi:10.48550/arxiv.1810.10701
arxiv created 2018/10/25 · openalex publication_date 2018/10/25 · arxiv updated 2018/10/26 · openalex created_date 2018/11/02 · openalex updated_date 2026/08/06
We studied engine-out soot samples collected from a heavy-duty direct-injection diesel engine and a port-fuel injection gasoline spark-ignition engine. The two types of soot samples were characterized using Raman spectroscopy with different laser power. A Matlab program using least-square-method with trust-region-reflective algorithm was developed for curve fitting. We used a DOE (design of experiments) method to avoid local convergence. This method was used for two-band fitting and three-band fitting. The fitting results were used to determine the intensity ratio of D and G Raman bands. We find that high laser power may cause oxidation of soot samples, which gives higher D/G intensity ratio. Diesel soot has consistently higher amorphous/graphitic carbon ratio and thus higher oxidation reactivity, in comparison to gasoline soot, which is revealed by the higher D/G intensity ratio in Raman spectra measured under the same laser power.