SCR with turbo and ASC/DOC close-coupled system

US10828603B2 · kind B2 · utility

Assignee

• Johnson Matthey Public Limited Company · GB

Inventors

• Hai-Ying Chen · Conshohocken, US
• Joseph Michael Fedeyko · Glen Mills, US
• Neil GREENHAM · Royston, GB
• Mikael Larsson · Mölndal, SE
• Jing Lu · Goleta, US
• Per Marsh · Nikkaluokta, SE
• David Micallef · Royston, GB
• Andrew Newman · Royston, GB

Key dates

• Filing date: Mar 29, 2018
• Grant date: Nov 10, 2020
• Expiry date: Mar 29, 2038

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A catalyst article including a substrate with an inlet end and an outlet end, a first zone and a second zone, where the first zone comprises: a) an ammonia slip catalyst (ASC) bottom layer comprising a platinum group metal on a support; and b) an SCR layer comprising a second SCR catalyst, the SCR layer located over the ASC bottom layer; where the second zone comprises a catalyst (“second zone catalyst”) selected from the group consisting of a diesel oxidation catalyst (DOC) and a diesel exotherm catalyst (DEC); wherein the ASC bottom layer extends into the second zone; and where the first zone is located upstream of the second zone. The ASC bottom layer may include a blend of: (1) the platinum group metal on a support and (2) a first SCR catalyst.