AMENDED CLAIMS received by the International Bureau on 18 September 2018 (18.09.2018)

1 . A method of regenerating a sorbent of gas in a capture process of said gas, wherein the capture process comprises recirculating the sorbent between a gas capturing system and regenerating reactor system, the method comprising the regenerating reactor system performing the steps of:

receiving a solid sorbent to be regenerated, wherein the sorbent is a sorbent of carbon dioxide gas; generating heat by combusting a fuel with an oxidising agent in the presence of a catalyst; regenerating the sorbent by using the generated heat to indirectly heat the sorbent so that the sorbent releases carbon dioxide gas; outputting the regenerated sorbent; and outputting the released carbon dioxide gas; wherein the received sorbent comprises a metal carbonate and the regenerated sorbent comprises a metal oxide.

2. The method according to claim 1 , wherein the regenerating reactor system comprises: a sorbent input that receives the sorbent; and a sorbent output that outputs the regenerated sorbent.

3. The method according to claim 2, wherein said step of regenerating the sorbent by indirectly heating the sorbent comprises indirectly heating the sorbent as it moves from the sorbent input to the sorbent output.

The method according to any preceding claim, wherein the received sorbent and the regenerated sorbent both comprise a metal carbonate and a metal oxide;

the amount of the metal carbonate in the received sorbent is greater than in the regenerated sorbent; and the amount of the metal oxide in the received sorbent is less than in the regenerated sorbent. 5. The method according to any preceding claim, wherein the sorbent comprises a binding agent.

The method according to any preceding claim, wherein the sorbent comprises natural and/or synthetic mixed metal oxides, preferably calcium oxide.

The method according to any preceding claim, wherein the sorbent comprises a plurality of different sorbents for a respective plurality of different gasses; and

the capture process comprises capturing a plurality of different gasses.

The method according to any preceding claim, wherein in said step of generating heat by combusting a fuel with an oxidising agent in the presence of a catalyst, pure oxygen is not input to the combustion process.

9. The method according to any preceding claim, wherein the fuel is a carbonaceous based fuel.

10. The method according to any preceding claim, wherein the fuel comprises one or more of methane, natural gas, syngas, biogas, gasified coal and coal dust.

1 1 . The method according to any preceding claim, wherein the oxidising agent is a gas comprising Oxygen, such as air.

12. The method according to any preceding claim, wherein the oxidising agent is a carbonaceous gas that comprises Oxygen, such as flue gas.

13. The method according to any preceding claim, wherein the catalyst comprises one or more of Ni, Co, Ru, Rh, Pd and Pt, the catalyst preferably being a Ni and Co mixture.

14. The method according to any preceding claim, wherein the combustion of the fuel with the oxidising agent is total combustion.

15. The method according to any preceding claim, wherein the regenerating reactor system comprises a moving bed reactor.

16. The method according to any preceding claim, wherein the regenerating reactor system comprises a fluidised bed reactor.

17. The method according to claim 2, or any claim dependent thereon, wherein: the regenerating reactor system comprises a plurality of tubes that provide heat to the regenerating reactor system; and the sorbent travels around the outside the tubes as it moves from the sorbent input to the sorbent output.

18. The method of claim 17, wherein the tubes are each elongate and linear.

19. The method of claim 17 or 18, wherein the tubes are aligned horizontally.

20. The method according to any of claims 17 to 19, wherein the step of generating heat by combusting a fuel with an oxidising agent in the presence of a catalyst is performed inside the tubes.

21 . The method according to any of claims 17 to 20, wherein at least some of the inner surfaces of the tubes are coated with the catalyst. 22. The method according to any of claims 17 to 21 , wherein the tubes are comprised by a housing of the regenerating reactor system.

23. The method according to any of claims 17 to 22, wherein fuel and/or oxidising agent is input into an end of each of the tubes.

24. The method according to any preceding claim, wherein the steps of generating heat by combusting a fuel with an oxidising agent in the presence of a catalyst and regenerating the sorbent are both performed within a housing of the regenerating reactor system.

25. The method according to any of claims 1 to 22, wherein the regenerating reactor system comprises a first system and a second system that is separate from the first system; the step of generating heat by combusting a fuel with an oxidising agent in the presence of a catalyst is performed by the first system; 52

the step of regenerating the sorbent is performed by the second system; and the method comprises transferring heat from the first system to the second system.

26. The method according to claim 25, wherein heat is transferred from the first system to the second system by a heat loop; wherein the heat loop preferably comprises one or more of liquefied helium, air, carbon dioxide or sodium.

27. The method according to any preceding claim, wherein the regenerating reactor system comprises a rotating drum and/or a stack of staggered plates.

28. The method according to any preceding claim, wherein the step of regenerating the sorbent comprises heating the sorbent to a temperature in the range 750°C to 1000°C, preferably a temperature in the range 800°C to 950°C, more preferably to a temperature of 900°C.

29. A method of capturing a gas by a gas capture system, the method comprising:

receiving a mixture of a plurality of gasses; using, by a gas capturing system, a sorbent to capture a gas within the received mixture of a plurality of gasses; outputting gas that has had a gas captured from it by the gas capturing system; regenerating the sorbent according to the method any of claims 1 to 28; 53

outputting released gas during the regeneration of the sorbent; and returning sorbent that has been regenerated to the gas capturing system such that the sorbent is recirculated around the gas capture system; wherein the sorbent is a solid.

30. A regenerating reactor system for regenerating a sorbent of gas in a gas capture system, wherein the gas capture system is configured to capture said gas by recirculating the sorbent between a gas capturing system and the regenerating reactor system, wherein the regenerating reactor system comprises:

a sorbent input for receiving a solid sorbent to be regenerated, wherein, when the regenerating system is in use, the sorbent is a sorbent of carbon dioxide gas; a combustor for generating heat by combusting a fuel with an oxidising agent in the presence of a catalyst; a reactor for regenerating the sorbent by using the heat generated by the combustor to indirectly heat the sorbent so that the sorbent releases carbon dioxide gas; a sorbent output for outputting the regenerated sorbent; and a gas output for outputting the released carbon dioxide gas. 31 . The system according to claim 30, wherein the reactor is configured to regenerate the sorbent as the sorbent moves through the reactor. 54

32. The system according to any of claims 30 or 31 , wherein, when the system is in use, the received sorbent comprises a metal carbonate, preferably calcium carbonate, and the regenerated sorbent comprises a metal oxide, preferably calcium oxide.

33. The system according to any of claims 30 to 32, wherein, when the system is in use, the received sorbent and the regenerated sorbent both comprise a metal carbonate and a metal oxide;

the amount of the metal carbonate in the received sorbent is greater than in the regenerated sorbent; and the amount of the metal oxide in the received sorbent is less than in the regenerated sorbent.

34. The system according to any of claims 30 to 33, wherein, when the system is in use, the sorbent comprises a binding agent.

35. The system according to any of claims 30 to 34, wherein, when the system is in use, the sorbent comprises natural and/or synthetic mixed metal oxides, preferably calcium oxide.

36. The system according to any of claims 30 to 35, wherein, when the system is in use, the sorbent comprises a plurality of different sorbents for a respective plurality of different gasses; and

the gas capture system is configured to capture a plurality of different gasses.

37. The system according to any of claims 30 to 36, wherein, when the system is in use, pure oxygen is not input to the combustor. 55

38. The system according to any of claims 30 to 37, wherein, when the system is in use, the fuel is a carbonaceous based fuel. 39. The system according to any of claims 30 to 38, wherein, when the system is in use, the fuel comprises one or more of methane, natural gas, syngas, biogas, gasified coal and coal dust.

40. The system according to any of claims 30 to 39, wherein, when the system is in use, the oxidising agent is a gas comprising Oxygen, such as air.

41 . The system according to any of claims 30 to 40, wherein, when the system is in use, the oxidising agent is a carbonaceous gas that comprises Oxygen, such as a flue gas.

42. The system according to any of claims 30 to 41 , wherein the catalyst comprises one or more of Ni, Co, Ru, Rh, Pd and Pt, the catalyst preferably being a Ni and Co mixture. 43. The system according to any of claims 30 to 42, wherein, when the system is in use, the combustion of the fuel with the oxidising agent by the combustor is total combustion.

44. The system according to any of claims 30 to 43, wherein the reactor comprises a moving bed reactor.

45. The system according to any of claims 30 to 44, wherein the reactor comprises a fluidised bed reactor. 46. The system according to any of claims 30 to 45, wherein: the reactor comprises a plurality of tubes that provide heat to the regenerating reactor system; and 56

the tubes are arranged so that, in use, the sorbent travels around the outside of the tubes as the sorbent moves from the sorbent input to the sorbent output.

47. The system according to claim 46, wherein the tubes are each elongate and linear.

48. The system according to claim 46 or 47, wherein the tubes are aligned horizontally.

49. The system according to any of claims 46 to 48, wherein the combustor is configured to combust the fuel with the oxidising agent in the presence of a catalyst inside of the tubes.

50. The system according to any of claims 46 to 49, wherein at least some of the inner surfaces of the tubes are coated with the catalyst.

51 . The system according to any of claims 46 to 49, wherein: the system comprises a housing; and the tubes are comprised by the housing.

52. The system according to any of claims 30 to 51 , wherein fuel and/or oxidising agent is input into an end of each of the tubes.

53. The system according to any of claims 30 to 52, wherein the system comprises a housing; and

the reactor and combustor are comprised by the housing. 57

54. The system according to any of claims 30 to 51 , wherein the reactor is separate from the combustor; and the system comprises conduits for carrying a fluid between the reactor and combustor so as to transfer heat from the reactor to the combustor.

55. The system according to claim 54, wherein, when the system is in use, the fluid is one or more of liquefied helium, air, carbon dioxide or sodium.

56. The system according to any of claims 30 to 55, wherein the reactor comprises a rotating drum and/or a stack of staggered plates.

57. The system according to any of claims 30 to 56, wherein the combustor is configured to heat the sorbent in the reactor to a temperature in the range 750°C to 1000°C, preferably a temperature in the range 800°C to 950°C, more preferably to a temperature of 900°C.

58. A gas capture system for capturing a gas from a mixture of a plurality of gasses, the system comprising:

a gas input arranged to receive a mixture of a plurality of gasses; a gas capturing system configured to use a sorbent to capture a gas within the received mixture of a plurality of gasses; an output arranged to output gas that has had a gas captured from it by the gas capturing system; a regenerating reactor system according to any of claims 30 to 57, wherein the regenerating reactor system is configured to receive sorbent that has been used to capture a gas within the received mixture of a plurality of 58

gasses in the gas capturing system, regenerate the sorbent so that the sorbent releases the captured gas and output the regenerated sorbent; an output arranged to output the released gas during the regeneration of the sorbent by the regenerating reactor system; and a conduit that is arranged to provide a return path of the sorbent output from the regenerating reactor system to the input of the gas capturing system such that the sorbent is recirculated around the gas capture system; wherein the sorbent is a solid.

59. The gas capture system of claim 58, wherein the gas capturing system comprises a moving bed reactor.

60. The gas capture system of claim 58 or 59, wherein the gas capturing system comprises a fluidised bed reactor.

61 . The gas capture system according to any of claims 58 to 60, wherein the gas capturing system is configured such that the flow of the sorbent in the gas capturing system is in contraflow with the flow of the received mixture of a plurality of gasses in the gas capturing system.

62. The gas capture system according to any of claims 58 to 61 , wherein the conduit that is arranged to provide a return path of the sorbent is a riser.

63. The gas capture system according to any of claims 58 to 62, further comprising one or more conduits that are arranged to provide a flow path of gas from an exhaust output of the combustor of the regenerating reactor system into the gas capturing system. 59

64. The gas capture system according to claim 63, wherein the flow path of gas from an exhaust output of the combustor of the regenerating reactor system into the gas capturing system comprises one or more gas turbine, heat exchanger or burner.

65. The gas capture system according to any of claims 58 to 64, further comprising a heat exchanger system arranged to transfer heat between sorbent output from the regenerating reactor system and sorbent input to the regenerating reactor system.

66. The gas capture system according to any of claims 58 to 65, further comprising a heat exchanger system arranged to transfer heat between gas output from the regenerating reactor system and fuel for a burner and/or the combustor of the regenerating reactor system.

67. The gas capture system according to any of claims 58 to 66, wherein the gas capture system is a post-combustion carbon dioxide capture system.

68. The gas capture system according to claim 67, wherein the gas capture system is configured to capture flue gas from a power plant.

69. The gas capture system according to any of claims 58 to 67, wherein the gas capture system is arranged to separate carbon dioxide gas from a mixture of carbon dioxide gas and at least hydrogen gas.

70. The gas capture system according to claim 69, wherein the gas capturing system of the gas capture system is a sorption-enhanced reforming, SER, reaction chamber.