Physical and Chemical Characterization of Gasoline and Diesel Engine Carbonaceous Particulate

Randy  Vander Wal, Penn State University

ORAL PRESENTATION: Oxidative reactivity, interaction with catalysts and environmental potential of engine produced particulate matter (PM) will depend upon the organic versus elemental carbon content and presence of other elements.  Relevant to all interests are physical structure and chemical composition.  HRTEM and associated image analysis tools yield structure spanning a 1000-fold length scale – from aggregate to nanostructure.  Spectroscopic techniques such as FTIR_ATR, and XPS yield complimentary chemical bonding information.  Elemental composition is yet a third characterization thread as alkali and alkaline earth elements, and non-metals can arise from oil additives, and from the parent fuel.  Tools, techniques and results for these three sectors of analysis will be illustrated upon PM originating from both gasoline and diesel engines, along with selected results of their impact on after-treatment systems.

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