Abstract
Combustion and gasification characteristics of deposits from diesel exhaust were investigated from samples collected from Opel, VW Rabbit and Oldsmobile diesel engines. Properties which may influence soot reactivity such as morphology, specific surface area, organic adsorbate, and occlusions of inorganic origin were characterized. Effects of temperature, oxygen pressure, and stepwise combustion on reactivity were also determined. Ignition and combustion kinetics of various soot deposits were measured gravimetrically, and requirements for fast soot oxidation in the presence of exhaust gas were assessed. It was found that reliable completion of soot combustion after ignition depends largely on oxygen pressure and soot bulk density. Ignition temperature can be lowered by suitable catalysts. Organic molecules, adsorbed on the soot surface, may also have an important influence on soot deposit ignition. Results confirm that partial combustion products suspended in exhaust gas are not oxidized significantly under conditions prevailing in diesel exhaust.
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