Power plants – Internal combustion engine with treatment or handling of... – Methods
Patent
1991-09-30
1992-09-01
Hart, Douglas
Power plants
Internal combustion engine with treatment or handling of...
Methods
60280, 60297, 422169, 4232137, F01N 328
Patent
active
051428644
ABSTRACT:
This invention relates to a process for minimizing hydrocarbon emissions from the exhaust streams of engines when the engines are first started, i.e., cold start. The process involves sequentially flowing the engine exhaust stream, which typically contains hydrocarbons, carbon monoxide and nitrogen oxide pollutants over a catalyst, the turbine side of a turbocharger and an adsorbent bed before discharging it into the atmosphere. The initial low temperature of the exhaust stream necessitates the use of the adsorbent bed. When the adsorbent bed (containing one or more molecular sieve beds) warms up (about 150.degree. C. to about 200.degree. C.), the majority of the exhaust stream is diverted around the adsorbent bed, while a minor portion is used to desorb the hydrocarbons adsorbed on the adsorbent bed and flowing these hydrocarbons through the compressor side of the turbocharger and then into the engine exhaust stream in front of the catalyst. When all the hydrocarbons are desorbed, the adsorbent bed is completely bypassed. The turbocharger lowers the temperature of the exhaust stream allowing hydrocarbons to be adsorbed for a longer period of time. The molecular sieves used in the invention are those that: 1) have a framework Si:Al ratio of at least 2.4; 2) are hydrothermally stable and 3) have a hydrocarbon selectivity greater than 1.
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Hart Douglas
McBride Thomas K.
Molinaro Frank S.
Snyder Eugene I.
UOP
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