Patent ID: 9649596
Date: 2017-05-16
CPC Classifications: B01D,B01J,F01N,Y02T

Claim:
1. A catalyst article comprising: (a) a wall flow monolith having an inlet face end and an outlet face and an axis of gas flow from said inlet face to said outlet face; (b) a first composition comprising a layer A comprising a first SCR catalyst and a layer B comprising a perovskite, wherein layer A is arranged to contact an exhaust gas before layer B; and (c) a second composition comprising layer C comprising a second SCR catalyst and layer D comprising a precious group metal, wherein layer Cis arranged to contact an exhaust gas before layer D; wherein the first and second compositions are disposed within a portion of the wall flow monolith and in series along the axis, and wherein said first composition is disposed proximal to the inlet face, and said second zone is disposed proximal to the outlet face.