Nanostructures and oxidation kinetics of diesel particulate matters

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P. Karin H. Oki K. Hanamura C. Charoenphonphanich

Abstract

Diesel particulate matters (PMs) must be removed from the exhaust gas emitted from diesel engines to protect the environment and human health; therefore, regulation of vehicle emissions has become increasingly strict. The nanostructures of diesel particulate matters emitted from an actual diesel engine and a diffusion flame burner were investigated by using a transmission electron microscopy (TEM) for better understanding. The single particulate’s sizes of both engine and burner were approximately 20-80 nm. The various size of particulate might be strongly related to drag and shear forces of fluid flow, Brownian motion force of gases molecules and electrostatic forces of charges carbon elements, even though such forces is the order of Pico-Newton. Thermo-gravimetric analysis (TGA) was used to investigate chemical kinetics of PM oxidation. The apparent activation energies of engine’s PM oxidation were approximately 105kJ/mol and 248kJ/mol for hydrocarbon and carbon zones, respectively. On the other hand, the apparent activation energies of lamp’s PM oxidation were approximately 139kJ/mol and 218kJ/mol, respectively. Consequently, much amount of soluble organic fraction (SOF) emitted from an actual engine may be strongly affected to the low apparent activation energy at the low temperature oxidation zone. Similarly, an internal combustion engine operates with very high temperature and pressure. Structure of soot emitted from diesel engine may be strong carbon bonding resulting in increasing of the apparent activation energy of carbon oxidation.

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RESEARCH ARTICLES

References

[1] Heywood, J.B. (1998). Internal Combustion Engine Fundamental, McGraw-Hill series in mechanical engineering, Singapore.

[2] Smith, O.I. (1981). Fundamentals of soot formation in flames with application to diesel engine particulate emissions, Progress in Energy and Combustion Science, Vol. 7, pp.275-291.

[3] Maricq, M.M. (2007). Review Chemical Characterization of particulate emissions from diesel engine: A review, Journal of Aerosol Science, Vol.38, pp.1079-1118.

[4] Kittelson, D.B. (1998). Engines and nanoparticles: A review, Journal of Aerosol Science, Vol.29, pp.575-588.

[5] Majewski, W.A. and Khair, M.K. (2006). Diesel Emissions and Their Control, SAE Order No.R-303, SAE International. Warrendale USA.

[6] Ishiguro, T. Takatori, Y. and Akihama, K. (1997). Microstructure of Diesel Soot Particles Probed by Electron Microscopy: First Observation of Inner Core and Outer Shell, Combustion and Flame, 108, pp.231-234.

[7] Vander Wal, R.A. Yezerets, A. Currier, N.W. Kim, D.H. and Wang, C.H. (2007). HRTEM Study of diesel soot collected from diesel particulate filters, Carbon, 45, pp.70-77.

[8] Ball, R.T. and Howard, J.B. (1971). Electric charge of carbon particles in flames, Symposium (International) on Combustion, Vol.13, Issue 1, pp.353-362.

[9] Maricq, M.M. (2006). On the electrical charge of motor vehicle exhaust particles, Journal of Aerosol Science, Vol.37, pp.858-874.

[10] Konstandopoulos, A.G. Kostoglou, M. Vlachos, N. and Kladopoulos, E. (2005). Progress in Diesel Particulate Filter Simulation, SAE Technical paper, 2005-01-0946.

[11] Konstandopoulos, K.G. Zarvalis, D. Kladopoulou E. and Dolios, L. (2006). A multi-reactor assembly for screening of diesel particulate filters, SAE Technical paper, 2006-01-0874.

[12] Tushima, S. Nakamura, I. Sakashita, S. Hirai, S. and Kitayama, D. (2010). Lattice Boltzmann simulation on particle transport and captured behaviors in a 3dreconstructed micro porous DPF, SAE Technical paper, 2010-01-0534.

[13] Hanamura, K. Karin, P. Cui, L. Rubio, P. Tsuruta, T. Tanaka, T. and Suzuki, T. (2009). Micro- and macroscopic visualization of particulate matter trapping and regeneration processes in wall-flow diesel particulate filters, International Journal of Engine research, Professional Engineering Publishing, Vol.10, No.5/2009, pp.305-321.

[14] Karin, P. Cui, L. Rubio, P. Tsuruta, T and Hanamura, K. (2009). Microscopic Visualization of PM Trapping and Regeneration in Micro-Structural Pores of a DPF Wall, SAE International Journal of Fuels and Lubricants, SAE International, Vol.2, No.1, pp.661-669.

[15] Fino, D. and Specchai, V. (2008). Review open issues in oxidative catalysis for diesel particulate abatement, Powder technology, Vol.180, pp.64-73.

[16] Suzuki, J. and Matsumoto, S. (2004). Development of catalysts for diesel particulate NOx reduction, Topics in Catalyst, Vol.28, pp.171-176.

[17] Neeft, J.P.A. Nijhuis, T.X. Smakman, E. Makkee, M. and Moulijn, J.A. (1997). Kinetics of the oxidation of diesel soot, Fuel, Vol.76, No.12, pp.1129-1136.

[18] Darcy, P. Costa, P.D. Mellottee, H. Trichard J.M. and Mariadassou, G.D. (2007). Kinetics of catalyzed and non-catalyzed oxidation of soot form a diesel engine, Catalysis Today, Vol.119, pp.252-256.

[19] Yezerets, A. Currier, N.W. and Eadler, H.A. (2003). Experimental Determination of the Kinetics of Diesel Soot Oxidation by O2 – Modeling Consequences, SAE Technical paper, 2003-01-0833

[20] Lorentzou, S. Pagkoura, C. Zygogianni, A. Kastrinaki, G. and Konstandopoulos, A.G. (2008). Catalytic nano-structured materials for next generation diesel particulate filters, SAE Technical paper, 2008-01-0417.

[21] Karin, P. and Hanamura, K. (2010). Particulate Matter Trapping and Oxidation on Catalyst-Membrane, SAE International Journal of Fuels and Lubricants, SAE International, Vol.3, No.1, pp.368-379.

[22] Karin, P. and Hanamura, K. (2010). Particulate Matter Trapping and Oxidation on a Diesel Particulate Filter, The First TSME International Conference on Mechanical Engineering, 2010.

[23] Oki, H. Karin, P. and Hanamura, K. (2010). Visualization of Oxidation of Soot Nanoparticles Trapped on a Diesel Particulate Membrane Filter, SAE International Journal of Engine, SAE International, 2011-01-0602.

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