SULFUR TRIOXIDE TRAP FOR USE IN PREVENTING CATALYST DEACTIVATION BY AMMONIUM SULFATE/BISULFATE

摘要

Exhaust aftertreatment systems including SO3 traps are disclosed. An example exhaust aftertreatment system includes an internal combustion engine and an SCR catalyst positioned in an exhaust passage operatively connected to the internal combustion engine. A decomposition tube is positioned in the exhaust passage upstream of the SCR catalyst and a reductant doser is configured to inject a reductant into the decomposition tube. An SO3 trap is positioned in the exhaust passage upstream of the decomposition tube and downstream of the internal combustion engine. The SO3 trap is configured to selectively capture SO3 within exhaust gas flowing through the exhaust passage.