Raman Spectral Analysis of Particulates of Diesel Engine with DOC and CDPF After-Treatment Devices

Abstract:

In order to study the effect of the after-treatment devices on the diesel engine particulates, a series of measurements were conducted. The after-treatment systems were an oxidation catalyst and two different catalytic contents of CDPFs. In this study, the effects of DOC and CDPFs on particulates were investigated by Raman spectra in order to clarify the composition and structure of the particulates. The results show that the Raman spectra of particulates are all made up of five peaks, while the Raman shift of the peaks observed no obvious change. The two groups of CDPFs led to the same increased trend of I_D2/I_G and I_D4/I_G, while the contrary trend of I_D1/I_G,, I_D3/I_G and I_ALL/I_G, indicating that different catalytic effect changing the process of structure and components of the particulates. While after DOC+CDPFs, the ratios of I_D1/I_G, I_D2/I_G, I_D1/I_G, I_D4/I_G and I_ALL/I_Gare all increased, this indicates that DOC also has certain effect on the degree of graphitization, but more organic compounds are formed after DOC+CDPFs, that is, the reactivity of particulates increases.

• Periodical: Advanced Materials Research (Volume 651)
• Pages: 401-407
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.651.401
• Online since: January 2013
• Authors: Zhi Hao Ma, Ying Chao, Lei Li, Bin Xu, Xin Xu, Fan Hua Ma
• Keywords: CDPF, Diesel Engine, DOC, Particulates, Raman Spectra

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