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Destruction of Carbonaceous Material and Nitrogen Oxides in Conditions of Diesel Exhaust
Sector:
Language:
English
Abstract
Post-treatment of diesel exhaust was studied on a laboratory
scale, using a reactor to simulate the post-combustion of soot
collected inside a monolithic particulate trap. A parametric study
of the trap regeneration was carried out. A periodic hydrocarbon
injection system was developed to assist the catalyzed trap
regeneration. This technique led to the trap regeneration with a
temperature of the entering gas of 150°C, which is very low. An
optimization of the injection process allowed one to minimize the
injected amount of hydrocarbons and to have good control of the
trap temperature.
Another advantage of the hydrocarbon injection is to provide
good conditions for reducing NO in an oxidizing atmosphere (10%
O2). The importance of the hydrocarbon content was pointed out by
a parametric study of NO conversion under a wide range of
hydrocarbon concentrations (1000 ppm to 2.5% in CH4
equivalents).