Characterization of particulate matter from direct injected gasoline engines

Carolin Wang-Hansen; Per Ericsson; Björn Lundberg; Magnus Skoglundh; Per-Anders Carlsson; Bengt Andersson

doi:10.1007/s11244-013-9994-4

Characterization of particulate matter from direct injected gasoline engines
Artikel i vetenskaplig tidskrift, 2013

The reactivity and reaction kinetics of particulate matter (PM) from direct injected gasoline (GDI) engines has been studied by O2 and NO2 based temperature programmed and isothermal step-response experiments, and the PM nano-structure has been characterized using HRTEM. The reactivity of the PM samples collected in filters during on-road driving was found to increase in the following order: Printex U\diesel\gasoline PI & gasoline DI\ethanol for O2 based combustion. The activation energies for O2 and NO2 based oxidation of PM collected from a GDI engine in an engine bench set-up was estimated to 146 and 71 kJ/mol respectively, which is comparable to corresponding values reported for diesel and model soot. Similar nano-structure features (crystallites plane dimensions, curvature and relative orientation) as observed for diesel soot were observed for gasoline PM.

Soot combustion

Particulate filter

Gasoline soot

Oxidation kinetics

Carbonaceous matter

Exhaust aftertreatment