Granted Patent B2

US 12,325,003 · App. 17/444,623 · Granted Jun 10, 2025

Inventors: Henry Arthur Claxton (London, GB); Olivier Leroux (Royston, GB); Andrew Scullard (Reading, GB); Thomas Manning Yeh (Audubon, PA)

Assignee: Johnson Matthey Public Limited Company

B01D53/06A01K1/0076B01D53/8634B01D2253/102B01D2253/108B01D2253/304B01D2257/304B01D2257/406B01D2257/55B01D2259/4009

Abstract

Claims (32)

1. A livestock house comprising an exhaust system for the treatment of an exhaust gas comprising ammonia in an amount of up to 250 ppm, the exhaust system comprising:

an exhaust gas inlet;

an ammonia storage material arranged to receive an exhaust gas from the exhaust gas inlet and produce an ammonia-rich gas containing at least 250 ppm ammonia;

an H 2 S sorbent material upstream of the ammonia storage material;

an ammonia oxidation catalyst arranged downstream of a selected portion of the ammonia storage material, the ammonia oxidation catalyst comprising one or more platinum group metals (PGMs) and being configured for oxidation of the ammonia-rich gas from the ammonia storage material; and

a heating device for heating gas before it passes through the selected portion of the ammonia storage material to release ammonia from the exhaust gas stored therein for treatment on the ammonia oxidation catalyst,

wherein the system is configured so that the selected portion of the ammonia storage material changes over time.

2. The livestock house according to claim 1 , wherein the exhaust gas comprises from 1 to 50 ppm ammonia.

3. The livestock house according to claim 1 , wherein the exhaust gas comprises from 10 to 25 ppm ammonia.

4. The livestock house according to claim 1 , wherein the heating device is configured to heat the gas before it passes through the selected portion of the ammonia storage material to a temperature of from 50 to 300° C.

5. The livestock house according to claim 1 , wherein the heating device is configured to heat the gas before it passes through the selected portion of the ammonia storage material to a temperature of from 100 to 250° C.

6. The livestock house according to claim 1 , wherein the heating device is configured to heat the gas before it passes through the selected portion of the ammonia storage material to a temperature of from 150 to 200° C.

7. The livestock house according to claim 1 , wherein the exhaust system further comprises one or more material filters between the exhaust gas inlet and the ammonia storage material.

8. The livestock house according to claim 1 , wherein the exhaust system further comprises an As sorbent material upstream of the ammonia storage material.

9. The livestock house according to claim 1 , the exhaust system comprising means for cooling a previously-heated portion of the ammonia storage material with a supply of ambient air.

10. The livestock house according to claim 1 , wherein the system comprises means for ducting gas from a previously-heated portion of the ammonia storage material to pre-heat a soon-to-be heated portion of the ammonia storage material.

11. The livestock house according to claim 1 , wherein the ammonia storage material is provided within a sorbent bed which is arranged to rotate so that, in use, portions of the ammonia storage material are each contacted with a heated gas in turn.

12. The livestock house according to claim 11 , wherein the sorbent bed is configured to rotate continuously at a constant rate.

13. The livestock house according to claim 11 , wherein the sorbent bed is configured to rotate stepwise at uniform intervals.

14. The livestock house according to claim 11 , wherein the sorbent bed has a diameter of 10 cm to 600 cm.

15. The livestock house according to claim 11 , wherein the sorbent bed has a diameter of 50 to 300 cm.

16. The livestock house according to claim 11 , wherein the sorbent bed has a diameter of 100 to 200 cm.

17. The livestock house according to claim 11 , wherein the sorbent bed has a depth of 5-50 cm.

18. The livestock house according to claim 11 , wherein the sorbent bed has a depth of 10-20 cm.

19. The livestock house according to claim 11 , wherein the sorbent bed comprises a plurality of inserts comprising the ammonia storage material.

20. The livestock house according to claim 1 , wherein the heating device is located between the exhaust gas inlet and the ammonia storage material.

21. The livestock house according to claim 1 , wherein the heating device is located between the ammonia storage material and the ammonia oxidation catalyst and wherein the system further comprises a duct for recycling at least a portion of the gas from the ammonia oxidation catalyst upstream of the selected portion of the ammonia storage material.

22. The livestock house according to claim 1 , wherein the heating device is a heat exchanger arranged to recover heat from gas downstream of the ammonia oxidation catalyst.

23. The livestock house according to claim 22 , further comprising a second heating device located between the ammonia storage material and the ammonia oxidation catalyst, wherein the second heating device is configured to heat gas passing to the ammonia oxidation catalyst to 200 to 300° C.

24. The livestock house according to claim 1 , wherein the ammonia oxidation catalyst comprises a zoned or layered configuration.

25. The livestock house according to claim 24 , wherein the ammonia oxidation catalyst comprises a zoned or layered configuration on a single substrate.

26. The livestock house according to claim 1 , further comprising a second heater for receiving and heating the ammonia-rich gas produced by the ammonia storage material, and wherein the system is configured such that the ammonia-rich gas flows directly from the ammonia storage material to the second heater, and then directly from the second heater to the ammonia oxidation catalyst.

Assignments (2)

Priority Claims (1)

Continuity (2)

References Cited (15)