Patent · US Active

Catalyzed soot filter

US8858904B2 · kind B2 · utility

9Cited by

10References

24Claims

0Family size

Assignee

BASF SE

Inventors

Alfred Punke · Walle, DE
Gerd Grubert · Hannover, DE
Yuejin Li · Edison, US
Ruediger Wolff · Nienburg, DE
Stanley Roth · Yardley, US
Torsten W. Müller-Stach · Hannover, DE
Attilio Siani · Shanghai, CN
Kenneth E. Voss · Iselin, US
Torsten Neubauer · Langenhagen, DE

Key dates

Filing date	Feb 22, 2011
Grant date	Oct 14, 2014
Priority date	—
Expiry date	Jun 24, 2032

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10S502/52719
WIPO fieldChemical engineering
WIPO sectorChemistry

Abstract

Described is a catalyzed soot filter wherein the inlet coating of the filter comprises an oxidation catalyst comprising platinum (Pt) and optionally palladium (Pd), wherein the outlet coating of the filter comprises an oxidation catalyst comprising Pd and optionally Pt, wherein the Pt concentration in the outlet coating is lower than the Pt concentration in the inlet coating and wherein the weight ratio of Pt:Pd in the outlet coating is in the range of from 0:1 to 2:1; and wherein the inlet coating and the outlet coating are present on the wall flow substrate at a coating loading ratio in the range of from 0.5 to 1.5, calculated as ratio of the loading of the inlet coating (in g/inch3 (g/(2.54 cm)3)):loading of the outlet coating (in g/inch3 (g/(2.54 cm)3)). Systems include such catalyzed soot filters, methods of diesel engine exhaust gas treatment and methods of manufacturing catalyzed soot filters are also described.

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