Aftertreatment system for simultaneous emissions control in stationary rich burn engines

摘要

A catalyst system may include a three-way catalyst that may receive exhaust gases from an engine and convert the exhaust gases to first converted exhaust gases. An ammonia slip catalyst may receive the first converted exhaust gases and convert the first converted exhaust gases to second converted exhaust gases. A hydrocarbon oxidation catalyst may receive the second converted exhaust gases and convert the second converted exhaust gases to third converted exhaust gases.

主权项

1. A system comprising:
a three-way catalyst that receives exhaust gases from an engine and converts the exhaust gases to first converted exhaust gases; an ammonia slip catalyst that receives the first converted exhaust gases and converts the first converted exhaust gases to second converted exhaust gases; a hydrocarbon oxidation catalyst that receives the second converted exhaust gases and converts the second converted exhaust gases to third converted exhaust gases wherein the hydrocarbon oxidation catalyst comprises a precious metal loading comprising palladium and platinum, and a ratio of the palladium to the platinum is greater than one; and a mid-bed air injection system that injects air into the first converted exhaust gases upstream of the ammonia slip catalyst and injects air into the second converted exhaust gases upstream of the hydrocarbon oxidation catalyst.