US 7,351,382 B2 · Particle filter having a catalytically active coating to accelerate burning off accumulated soot particles during a regeneration phase

Abstract

The present invention is directed to a particle filter to remove soot from the exhaust gas of a diesel engine. The particle filter contains a catalytically active coating on a filter body to accelerate bum-off during a regeneration phase of the soot particles collected on the filter. The particle filter comprises a catalytic coating containing compounds of barium, compounds of magnesium, and at least one element of the platinum group metals. The invention is further directed to a process for accelerated combustion of soot particles collected on the filter from lean exhaust gas of a diesel engine in which the soot particles have a soot ignition temperature and the particle filter is actively regenerated from time to time by raising the temperature of the particle filter above the soot ignition temperature and burning off the soot particles.

Claims6

Dependent claims

A particle filter for removing soot from diesel engine exhaust gas, said particle filter comprising:

(a) a filter body;
(b) a catalytic coating located on said catalytic coating comprises compounds of compounds of and at least one element of the platinum, wherein the compounds of barium and compounds of magnesium occur as material or in supported form on a support material and the compounds of barium and compounds of magnesium are selected from the group consisting of carbonates, oxalates, hydroxides, carboxylates, oxides, and mixtures thereof, and the compounds of barium occur in the coating in combination with a homogeneous Mg/Al mixed oxide of magnesium oxide and aluminum oxide, in which the mixed oxide contains magnesium oxide at a concentration of 1 to 40% by weight, based on the total weight of the Mg/Al mixed oxide;
and
(c) the coating comprises oxides of cerium, zirconium, and manganese.

1 more element

Dependencies are inferred from the claim text.

Facts

Application

10/397,984Filed 26 Mar 2003

Priority

DE 102 14 34328 Mar 2002

Published

US 2004/0067176 A18 Apr 2004

Granted

1 Apr 2008

Term ends

Not estimatedThe source records don’t support an estimate.

Classification16 codes

B01D 53/944
By catalytic processes: simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts
B01D 53/96
Chemical or biological purification of waste gases: regeneration, reactivation or recycling of reactants
B01J 23/58
Platinum group metals: with alkali- or alkaline earth metals
F01N 3/0231
Using means for regenerating the filters, e.g. by burning trapped particles: using special exhaust apparatus upstream of the filter for producing…

Particle filter having a catalytically active coating to accelerate burning off accumulated soot particles during a regeneration phase

Life of this patent

Particle filter having a catalytically active coating to accelerate burning off accumulated soot particles during a regeneration phase

Life of this patent

Abstract

Claims6