Systems and methods for enhancing catalytic efficiency of SCR catalysts

Patent metadata

Field	Value
Publication number	US-10082062-B2
Application number	US-201615567029-A
Country	US
Kind code	B2
Filing date	Apr 18, 2016
Priority date	Apr 21, 2015
Publication date	Sep 25, 2018
Grant date	Sep 25, 2018

Abstract

A method for increasing a catalytic efficiency of a catalyst, comprising providing a catalyst. Finally, the catalyst is installed into a selective catalytic reduction system of an aftertreatment system configured to reduce constituents of an exhaust gas generated by an engine. The catalyst is soaked in a liquid which consists essentially of one of water or a water-comprising solution. The soaking occurs at least one of before or after installing the catalyst in the selective catalytic reduction system. The catalyst can include a copper zeolite catalyst.

First claim

What is claimed is:

1. A method for increasing a catalytic efficiency of a catalyst, comprising:
providing a catalyst;
installing the catalyst into a selective catalytic reduction system of an aftertreatment system configured to reduce constituents of an exhaust gas generated by an engine, the aftertreatment system comprising a liquid insertion assembly and a controller operatively coupled to the liquid insertion assembly;
determining, by the controller, that a new catalyst assembly is inserted into the selective catalytic reduction system; and
in response to determining, by the controller, that the new catalyst assembly is inserted into the selective catalytic reduction system, instructing, by the controller, the liquid insertion assembly to soak the catalyst in a liquid, the liquid consisting essentially of one of water or a water-comprising solution, wherein the soaking occurs at least one of before or after installing the catalyst into the selective catalytic reduction system.

2. The method of claim 1 , wherein the catalyst includes a copper zeolite catalyst.

3. The method of claim 1 , wherein the catalyst is soaked in the liquid before installing the catalyst into the selective catalytic reduction system.

4. The method of claim 3 , wherein the soaking with the liquid does not cause leaching of copper from the catalyst.

5. The method of claim 1 , further comprising:
integrating the catalyst into a catalyst assembly,
wherein installing the catalyst comprises installing the catalyst assembly into the selective catalytic reduction system.

6. The method of claim 1 , wherein the liquid consists essentially of the water-comprising solution, and wherein the water-comprising solution comprises at least one of an aqueous solution, a basic solution, and an aqueous solution of active catalyst components.

7. The method of claim 1 , wherein the liquid consists essentially of the water-comprising solution, and wherein the water-comprising solution comprises a predetermined amount of at least one of a mineral, a salt, and an electrolyte.

8. The method of claim 1 , further comprising:
flowing the exhaust gas through the aftertreatment system; and
inserting the liquid into the selective catalytic reduction system at predetermined time intervals, determined by the controller, to periodically soak the catalyst assembly with the liquid.

9. The method of claim 8 , wherein the catalyst is not soaked in the liquid before installing the catalyst in the catalyst assembly.

10. The method of claim 8 , further comprising:
inserting an exhaust reductant into the selective catalytic reduction system to facilitate reduction of constituents of the exhaust gas.

11. An aftertreatment system, comprising;
a selective catalytic reduction system comprising a catalyst assembly installed therein, the catalyst assembly comprising a catalyst configured to decompose constituents of an exhaust gas flowing through the aftertreatment system;
a liquid insertion assembly configured to deliver a liquid to the catalyst, the liquid consisting essentially of one of water or a water-comprising solution; and
a controller operatively coupled to the liquid insertion assembly;
wherein the controller is configured to determine that a new catalyst assembly is inserted into the selective catalytic reduction system and in response to determining, by the controller, that the new catalyst assembly is inserted into the selective catalytic reduction system instruct the liquid insertion assembly to soak the catalyst with the liquid at least one of before or after installing the catalyst assembly in the aftertreatment system.

12. The aftertreatment system of claim 11 , wherein the catalyst includes a copper zeolite catalyst.

13. The aftertreatment system of claim 11 , wherein the liquid insertion assembly is located separate from the selective catalytic reduction system, and wherein the controller is configured to instruct the liquid insertion assembly to soak the catalyst with the liquid before installing the catalyst into the selective catalytic reduction system.

14. The aftertreatment system of claim 11 , wherein the liquid consists essentially of the water-comprising solution, and wherein the water-comprising solution comprises at least one of an aqueous solution, a basic solution, and an aqueous solution of active catalyst components.

15. The aftertreatment system of claim 11 , wherein the liquid consists essentially of the water-comprising solution, and wherein the water-comprising solution comprises a predetermined amount of at least one of a mineral, a salt, and an electrolyte.

16. The aftertreatment system of claim 11 , wherein the controller is further configured to instruct the liquid insertion assembly to insert the liquid into the selective catalytic reduction system at predetermined time intervals so as to periodically soak the catalyst assembly with the liquid.

17. The aftertreatment system of claim 16 , wherein the predetermined time intervals comprise at least one of predetermined hours of operation of the aftertreatment system, a fuel refill of an engine associated with the aftertreatment system and installation of a new catalyst assembly in the aftertreatment system.

18. The aftertreatment system of claim 11 , further comprising:
a reductant insertion assembly configured to insert an exhaust reductant into the selective catalytic reduction system to facilitate reduction of constituents of the exhaust gas.

19. An apparatus, comprising:
a selective catalytic reduction system structured to be operatively coupled to an aftertreatment system, the selective catalytic reduction system comprising:
a housing defining an inlet and an outlet;
a liquid insertion assembly;
a controller operatively coupled to the liquid insertion assembly; and
a catalyst assembly installed in the housing, the catalyst assembly comprising a catalyst configured to decompose constituents of an exhaust gas;

wherein the catalyst comprises a liquid soaked catalyst, the liquid in which the catalyst is soaked consisting essentially of one of water or a water-comprising solution; and
wherein the controller is configured determine that a new catalyst assembly is inserted into the selective catalytic reduction system and in response to determining, by the controller, that the new catalyst assembly is inserted into the selective catalytic reduction system instruct the liquid insertion assembly to soak the catalyst with the liquid at least one of before or after installing the catalyst assembly in the aftertreatment system.

20. The apparatus of claim 19 , wherein the catalyst comprises a copper zeolite catalyst.

21. The apparatus of claim 19 , wherein the liquid consists essentially of the water-comprising solution, and wherein the water-comprising solution comprises at least one of an aqueous solution, a basic solution, and an aqueous solution of active catalyst components.

22. The apparatus of claim 19 , wherein the liquid consists essentially of the water-comprising solution, and wherein the water-comprising solution comprises a predetermined amount of at least one of a mineral, a salt, and an electrolyte.

23. The apparatus of claim 19 , wherein the catalyst is soaked with the liquid before installing the catalyst assembly in the selective catalytic reduction system.

24. The apparatus of claim 19 , wherein the catalyst is soaked with in the liquid after installing the catalyst assembly into the se

Assignees

• Cummins Emission Solutions Inc

Inventors

• Ottinger Nathan A
• Liu Z Gerald
• Xi Yuanzhou
• Veele Rebecca A
• Su Changsheng C
• Schmidt Niklas

Classifications

• B01D2255/20761

  Copper · CPC title

• B01D53/9418

  for removing nitrogen oxides by selective catalytic reduction [SCR] using a reducing agent in a lean exhaust gas · CPC title

• B01J29/76

  Iron group metals or copper · CPC title

• B01D2255/50

  Zeolites · CPC title

• F01N3/208 Primary

  Control of selective catalytic reduction [SCR], e.g. by adjusting the dosing of reducing agent · CPC title