Particle filter with SCR-active coating

Patent metadata

Field	Value
Publication number	US-10961886-B2
Application number	US-201716334113-A
Country	US
Kind code	B2
Filing date	Sep 20, 2017
Priority date	Sep 20, 2016
Publication date	Mar 30, 2021
Grant date	Mar 30, 2021

Abstract

The present invention relates to a particle filter which comprises a wall-flow filter and SCR-catalytically active material, wherein the wall-flow filter comprises ducts which extend in parallel between a first and a second end of the wall-flow filter and which are alternately closed off in gas-type fashion either at the first or at the second end and which are separated by porous walls, and wherein the SCR-active material comprises a zeolite which is exchanged with copper and/or iron and which is situated in the form of a coating in the porous walls of the wall-flow filter, characterized in that the SCR-catalytically active coating comprises palladium.

First claim

The invention claimed is:

1. A particle filter comprising a wall-flow filter and an in-wall coating of an SCR-active material and palladium,
wherein the wall-flow filter comprises ducts which extend in parallel between a first and a second end of the wall-flow filter, which are alternatingly closed off in gas-tight fashion either at the first or at the second end, and which are separated by porous walls having pores,
wherein the SCR-active material comprises a zeolite exchanged with copper and/or iron, and
wherein the SCR-active material and the palladium has penetrated the pores of the porous walls and thereby coats the inner pore surfaces of the porous walls.

2. The particle filter according to claim 1 , wherein the palladium is homogeneously distributed in the SCR-active material.

3. The particle filter according to claim 1 , wherein the palladium is supported on a carrier material.

4. The particle filter according to claim 3 , wherein the carrier material has a BET surface area of 30 to 250 m 2 /g (determined in accordance with DIN 66132).

5. The particle filter according to claim 4 , wherein the carrier material is aluminum oxide, silicon oxide, magnesium oxide, titanium oxide, or a mixture or a mixed oxide of at least two of these oxides.

6. The particle filter according to claim 1 , wherein the in-wall coating contains palladium in amounts of 10 to 1000 ppm in relation to the SCR-active material.

7. The particle filter according to claim 1 , wherein the SCR-active material contains a small-pore zeolite that is exchanged with copper and/or iron.

8. The particle filter according to claim 7 , wherein the small-pore zeolite belongs to one of the structure types AEI, CHA (chabazite), ERI (erionite), LEV (levyne), and KFI.

9. The particle filter according to claim 1 , wherein the SCR-active material
(a) contains a copper-exchanged zeolite of the chabazite type and palladium,
(b) consists of a copper-exchanged zeolite of the chabazite type and palladium, or
(c) consists of a copper-exchanged zeolite of the chabazite type and palladium supported on a carrier material.

10. The particle filter according to claim 1 , wherein the SCR-active material
(a) contains a copper-exchanged zeolite of the levyne type,
(b) consists of a copper-exchanged zeolite of the levyne type and palladium, or
(c) consists of a copper-exchanged zeolite of the levyne type and palladium supported on a carrier material.

11. The particle filter according to claim 1 , wherein the SCR-active material
(a) contains a copper-exchanged zeolite of the AEI type,
(b) consists of a copper-exchanged zeolite of the AEI type and palladium, or
(c) consists of a copper-exchanged zeolite of the AEI type and palladium supported on a carrier material.

Assignees

• Umicore Ag & Co Kg

Inventors

• Schuler Anke
• Dornhaus Franz

Classifications

• B01J35/615

  100-500 m2/g · CPC title

• B01J35/613

  10-100 m2/g · CPC title

• B01J35/56

  Foraminous structures having flow-through passages or channels, e.g. grids or three-dimensional [3D] monoliths · CPC title

• Y02T10/12

  Improving ICE efficiencies · CPC title

• Y02A50/20

  Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters · CPC title