The Influence of Fuel Type on Diesel Particulate Characteristics and Reactivity with O2 and NO2

Friday, September 7, 2018

Dr. Andrea Strzelec

Department of Mechanical Engineering

Mississippi State University

Hand 1144; 3:30 PMAndrea

Abstract: The NO2 oxidation kinetics and burning mode for diesel particulate from light-duty and medium-duty engines fueled with either ultra low sulfur diesel or soy methyl ester biodiesel blends have been investigated and are shown to be significantly different from oxidation by O2, which show fuel source dependence.  Oxidation kinetics were measured using a flow-through packed bed microreactor for temperature programmed reactions and isothermal differential pulsed oxidation reactions. The burning mode was evaluated using the same reactor system for flowing BET specific surface area measurements and HR-TEM with fringe analysis to evaluate the nanostructure of the nascent and partially oxidized particulates. The low activation energy measured, specific surface area progression with extent of oxidation, HR-TEM images and difference plots of fringe length and tortuosity paint a consistent picture of higher reactivity for NO2, which reacts indiscriminately immediately upon contact with the surface, leading to the Zone I or shrinking core type oxidation. In comparison, O2 oxidation is shown to have relatively lower reactivity, preferentially attacking highly curved lamella, which are more reactive due to bond strain, and short lamella, which have a higher proportion of more reactive edge sites. This preferential oxidation leads to Zone II type oxidation, where solid phase diffusion of oxygen via pores contributes significantly to slowing the overall oxidation rate, by comparison. In addition, I will describe some of my other research ventures, current and future.

Bio: Andrea Strzelec is an Assistant Professor the Department of Mechanical Engineering and principle investigator of the Combustion & Reaction Characterization Laboratory (CRCL) at the Center for Advanced Vehicular Systems (CAVS) at Mississippi State University. Previous to her academic career, she did postdoctoral fellowships at Oak Ridge and Pacific Northwest National Laboratories. She received her interdisciplinary Combustion Engineering Ph.D. from the University of Wisconsin-Madison, working through the Engine Research Center. She teaches thermodynamics, heat transfer, internal combustion engines, and combustion science. Dr. Strzelec’s sustainable energy research interests are in the area of heterogeneous reaction kinetics and characterization with specific focus on automotive combustion and emissions aftertreatment; low temperature catalysis; particulate filtration; pyrolysis; and remediation of hydrocarbon contamination. She has been PI (7), Co-PI (2) or Co-I (5) of 14 sponsored research projects totaling ~$1.65M, with ~$720k pro-rated to her. Her work has been published in top journals, including Topics in Catalysis, Energy & Fuels, Fuel, and International Journal of Engine Research.

Dr. Strzelec is the Vice Chair of the SAE Exhaust Aftertreatment and Emissions Committee, Associate Editor of the Journal of Emissions Control Science & Technology, a recipient of the 2016 SAE Forrest R. McFarland Service Award, 2015 SAE Ralph R. Teetor Educational Award and the recipient of the Texas A&M Mechanical Engineering 2015 Brittian Undergraduate Teaching Award.

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