Patent · US Active

LNT-SCR system optimized for thermal gradient

US7950226B2 · kind B2 · utility

6Cited by

14References

20Claims

0Family size

Assignees

Eaton Corporation · US
UMICORE AG & CO. KG · DE

Inventors

James E. McCarthy, Jr. · Canton, US
Owen Bailey · Greenville, US

Key dates

Filing date	May 14, 2007
Grant date	May 31, 2011
Priority date	—
Expiry date	Mar 30, 2030

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY02T10/40
WIPO fieldEnvironmental technology
WIPO sectorChemistry

Abstract

In an exhaust aftertreatment system, two LNTs having differing compositions are configured in series downstream from an inline fuel reformer. The downstream LNT is adapted for desulfation at higher temperatures than the upstream LNT. During desulfation, the system develops temperature gradients with the temperatures increasing in the direction of exhaust flow. The ordering of the LNTs is designed utilize these gradients. In a preferred embodiment, the system also includes two SCR catalysts having different compositions. The SCR catalyst with a composition adapted to tolerate higher temperatures is located nearer the downstream end of the system.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.