Four phase process for controlling emissions during cold...

Details Four phase process for controlling emissions during cold... Four phase process for controlling emissions during cold...

B - Operations, Transporting

01

D

B01D 53/04 (2006.01) B01J 20/18 (2006.01) F01N 3/18 (2006.01) B01D 53/36 (1990.01)

Patent

CA 2051552

"FOUR PHASE PROCESS FOR CONTROLLING EMISSIONS DURING COLD START OF INTERNAL COMBUSTION ENGINE" ABSTRACT A pollutant containing engine exhaust stream is treated upon cold startup by first flowing the engine exhaust stream, which is relatively cool, over an adsorbent zone [5] which comprises an adsorbent bed, i.e., a molecular sieve bed, capable of preferentially adsorbing pollutants such as hydrocarbons. This provides a first exhaust stream which is flowed over a primary catalyst [7] which converts the pollutants to innocuous compounds and then discharging the resultant treated exhaust stream to the atmosphere. When the adsorbent bed reaches a temperature of 150 to 200°C, the entire engine exhaust stream is completely diverted over the primary catalyst [7]. When the inlet temperature tothe primary catalyst [7] has reached 350 to 400°C, a minor portion of the engine exhaust stream is diverted over the adsorbent bed to desorb the pollutants adsorbed on the bed and carry them over the primary catalyst where they are converted to innocuous components. After a certain amount of time, the entire engine exhaust stream is again diverted over the primary catalyst [7], thereby isolating the adsorbent bed to minimize deterioration. The adsorbent zone [5] may also have a secondary catalyst bed arranged immediately after it.

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