Non-platinum based ammonia oxidation catalysts and applications on aftertreatment systems

Patent metadata

Field	Value
Publication number	US-2016107150-A1
Application number	US-201414516632-A
Country	US
Kind code	A1
Filing date	Oct 17, 2014
Priority date	Oct 17, 2014
Publication date	Apr 21, 2016
Grant date	—

Abstract

An aftertreatment system utilizes chemical reactions to treat an exhaust gas flow. A device for use within an aftertreatment system includes a platinum-free ammonia oxidation catalyst comprising palladium to treat ammonia slip in the exhaust gas flow. In one embodiment, the catalyst includes a Pd/Cu/SAPO-34 catalyst used within a selective catalytic reduction device or in a device downstream of the selective catalytic reduction device.

First claim

1 . A device for aftertreatment of an exhaust gas flow, the device comprising:
a platinum-free ammonia oxidation catalyst comprising palladium.

2 . The device of claim 1 , wherein the device further comprises a selective-catalytic reduction device.

3 . The device of claim 2 , wherein the catalyst comprises a catalyst brick within the selective-catalytic reduction device.

4 . The device of claim 2 , wherein the catalyst is dispersed as a separate layer under a selective catalytic reduction catalyst applied within the device.

5 . The device of claim 2 , wherein the catalyst is dispersed as a separate layer on top a selective catalytic reduction catalyst applied within the device.

6 . The device of claim 2 , wherein the catalyst is dispersed uniformly within a washcoat with selective catalytic reduction catalysts applied within the device

7 . The device of claim 1 , wherein the device further comprises a diesel oxidation catalyst.

8 . The device of claim 7 , wherein the catalyst comprises a catalyst brick within the diesel oxidation catalyst device.

9 . The device of claim 1 , wherein the catalyst is applied as a washcoat upon a flow thorough substrate.

10 . The device of claim 1 , wherein the catalyst is applied as a wall flow substrate.

11 . The device of claim 1 , wherein the catalyst is applied as zone coatings within one of a selective catalytic reduction catalyst and a selective catalytic reduction-on-filter catalysts.

12 . The device of claim 1 , wherein the catalyst further comprises a zeolite selected from the group consisting of Beta, ZSM-5, SSZ-13, Y, SAPO-5, SAPO-11, and SAPO-34.

13 . The device of claim 1 , wherein the catalyst further comprises a Pd/Cu/SAPO-34 catalyst.

14 . The device of claim 1 , wherein the catalyst includes palladium loading values between 2 g/ft 3 and 20 g/ft 3 .

15 . The device of claim 1 , wherein the catalyst includes a palladium loading value of 15 g/ft 3 .

16 . The device of claim 1 , wherein the catalyst further comprises a metal selected from iron, cobalt, nickel, and manganese.

17 . A system for aftertreatment of an exhaust gas flow, the system comprising:
at least one device including a platinum-free ammonia oxidation catalyst comprising palladium.

18 . The system of claim 17 , wherein the catalyst is located within a selective catalytic reduction device utilizing ammonia to treat the exhaust gas flow.

19 . The system of claim 18 , further comprising a diesel oxidation catalyst device using a second platinum-free palladium catalyst.

Assignees

• Gm Global Tech Operations Inc

Inventors

• Thomas Eric D
• Qi Gongshin

Classifications

• B01J29/85 Primary

  Silicoaluminophosphates [SAPO compounds] · CPC title

• B01D2255/904

  Multiple catalysts · CPC title

• B01J23/8926

  Copper and noble metals · CPC title

• B01D53/944

  Simultaneously removing carbon monoxide, hydrocarbons or carbon making use of oxidation catalysts (three-way-catalysts [TWC] B01D53/9445) · CPC title

• B01J37/0215

  Coating · CPC title