Ammonia-burning combustion engine
An ammonia-burning combustion engine. In particular, the present invention relates to an internal combustion engine for the combustion of ammonia, the engine comprising one or more combustions chambers comprising an ammonia combustion catalyst. The invention further relates to a method for operating an internal combustion engine by the combustion of ammonia, the method comprising contacting ammonia with a heated ammonia combustion catalyst in a combustion chamber of the engine to combust the ammonia.
1. An internal combustion engine for the combustion of ammonia, the engine comprising one or more combustions chambers comprising an ammonia combustion catalyst, wherein the ammonia combustion catalyst is provided as a coating on a porous substrate, and the ammonia combustion catalyst is provided with a support material comprising titania or large pore zeolite.
2. The internal combustion engine according to claim 1 , wherein the ammonia combustion catalyst comprises one or more metal oxides, preferably one or more selected from the group consisting of Ag 2 O, MnO 2 , Co 3 O 4 , CuO, V 2 O 5 , Fe 2 O 3 , Pr 6 O 11 , RuO 2 and NiO.
3. The internal combustion engine according to claim 1 , wherein the porous substrate is a honeycomb monolith substrate.
4. The internal combustion engine according to claim 1 , wherein the internal combustion engine is a continuous combustion engine and the ammonia combustion catalyst is provided on one or more of a plurality of turbine blades, a turbine shaft and/or walls of the combustion chamber.
5. The internal combustion engine according to claim 1 , wherein the internal combustion engine is a reciprocating engine and each combustion chamber is a cylinder provided with a piston, wherein the ammonia combustion catalyst is provided on a piston crown and/or within a cylinder head.
6. The internal combustion engine according to claim 5 , wherein the engine is configured to compress gases in the cylinder, to increase the temperature in the cylinder and to thereby heat-activate the ammonia combustion catalyst.
7. The internal combustion engine according to claim 6 , wherein the cylinder further comprises means for providing an ignition spark.
8. The internal combustion engine according to claim 5 , wherein the cylinder comprises an inlet for air and an inlet for ammonia, or a combined air and ammonia inlet, and an outlet for exhaust gases.
9. The internal combustion engine according to claim 8 , wherein the ammonia combustion catalyst is provided around the ammonia inlet.
10. The internal combustion engine according to claim 1 , wherein the ammonia combustion catalyst is provided with a support material comprising titania.
11. The internal combustion engine according to claim 10 , wherein the titania comprises rutile and/or brookite.
12. A method for operating an internal combustion engine by the combustion of ammonia, the method comprising contacting ammonia with a heated ammonia combustion catalyst in a combustion chamber of the engine to combust the ammonia and to thereby produce an increased gas pressure to drive a piston, wherein the ammonia combustion catalyst is provided as a coating on a porous substrate, and the ammonia combustion catalyst is provided with a support material comprising titania or large pore zeolite.
13. The method according to claim 12 , wherein ammonia is introduced into the combustion chamber together with air and then compression-heated by a moving piston, and, optionally, ignited with a spark when compressed.
14. The method according to claim 12 , wherein ammonia is introduced into a combustion chamber containing compressed, compression-heated air.