Patent ID: 9611773
Date: 2017-04-04
CPC Classifications: B01D,B01J,F01N,Y02A,Y02T

Claim:
1. A zoned catalysed substrate monolith comprising a first zone and a second zone, wherein the first zone and the second zone are arranged axially in series, wherein the first zone comprises a platinum group metal loaded on a support and a first base metal oxide selected from the group consisting of iron oxide, manganese oxide, copper oxide, zinc oxide, nickel oxide, and mixtures thereof or a first base metal selected from the group consisting of iron, manganese, copper, zinc, nickel, and mixtures thereof loaded on an inorganic oxide and the second zone comprises a second base metal oxide selected from the group consisting of iron oxide, manganese oxide, copper oxide, zinc oxide, nickel oxide, and mixtures thereof or a second base metal selected from the group consisting of iron, manganese, copper, zinc, nickel, and mixtures thereof loaded on an inorganic oxide, wherein the second base metal is different from the first base metal, and the second zone does not contain copper or iron loaded on a zeolite.