In spite of the energy crises and the recession, there has been a
global, explosive growth in the amount of motor vehicles. In the
past 50 years, the amount has increased from 50 to 700 million
vehicles. For economical reasons they will probably continue to be
used for a considerable number of years, despite the poor yield of
internal combustion engines resulting in the inevitable production
of some gaseous pollutants. The subsequent increase of gaseous
pollutants in our atmosphere caused by exhaust gas from automobiles
has enhanced the problem of the elimination of these pollutants
produced by internal combustion engines. Catalysis has proven to be
the best solution to lower the content of exhaust gas in
pollutants.
As its predecessors, CAPoC4 proved to be a suitable platform for
discussing technological improvements and developments along with
future perspectives and challenges. In the light of new results and
further legislative regulations, the following topics were
intensely discussed:
*low light-off behaviour based on improved catalysts and substrate
formulations
*efficient adsorber systems for storage of hydrocarbon
emissions
*electrically heated catalyst systems ahead the main catalyst or,
alternatively, close coupled catalysts (at the manifold of the
engine)
- lean DeNOx catalysts allowing for decomposition of NOx in the
oxygen-rich exhaust of direct injection gasoline engines and high
speed injection diesel engines or, alternatively, NOx
trapping/reduction in a hybrid approach
* collection and destruction of dry particulates or soot.
There is no doubt that clean vehicle technology is a vital part
of improving air quality. Challenges remain and call
fortechnological answers. Catalytic air pollution control is still
an area providing a considerable incentive for innovative work.
General
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