Ammonia oxidation catalyst with zoned scr inlet and pgm outlet for gasoline applications

Abstract

The present invention relates to an exhaust gas treatment system for reducing ammonia emission from a gasoline engine comprising a three-way conversion catalyst (TWC) and a gasoline particulate filter (GPF) further comprising a catalytic function for reducing tailpipe emission of ammonia wherein the catalytic function for reducing tailpipe emission of ammonia includes at least a combination of a selective catalytic reduction catalyst (SCR) and an ammonia oxidation catalyst (AM Ox). The present invention also relates to a method for preparing the exhaust gas treatment system and a method for treating an exhaust gas stream from a gasoline engine using the inventive exhaust gas treatment system.

Dependencies are inferred from the claim text.