Gas treatment system and a method for using the same

摘要

In one embodiment, a method of treating a gas stream comprises: controlling an amount of the NH₃ entering a catalytic unit and converting NO₂ and the NH₃ to N₂ in the catalytic unit, wherein greater than or equal to about 60 wt % of NOx initially in the gas stream is converted to N₂. In one embodiment, a gas treatment system comprises: a plasma reactor disposed downstream of an engine; a cracking catalyst disposed downstream of the engine; and a catalytic unit capable of converting NO and HC to NH₃, and capable of converting NH₃ and NO₂ to N₂.