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In a hydrogen internal combustion engine, where the only emission is nitrous oxide, could that nitrous oxide then be put back into the engine to produce more oxygen and make it perform better? What would the emissions of doing that be?
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+ Automotive engineering
+ Engines
+ Oxygen
+ Nitrous oxide
+ Hydrogen
Posted by
Marc Brevoort
In a hydrogen internal combustion engine, where the only emission is nitrous oxide, could that nitrous oxide then be put back into the engine to produce more oxygen and make it perform better? What would the emissions of doing that be?
There doesn’t have to be any emission. Just keep temperatures below 1500 degrees C and not a single NOx molecule will form. Temperatures are kept low by keeping the compression low or by using water injection. Or make sure there’s no excess oxygen present by using rich mixtures or using EGR, then hydrogen will consume it all, and nitrogen won’t be able to bind with oxygen.
If you do have excess oxygen, and temperatures above 1500 degrees C, NOx will form. You can use a catalytic converter to neutralise it, or use selective catalytic reduction with ammonium. Feeding the NOx back into the engine won’t help anything. It won’t make the engine perform better, it won’t neutralise the NOx, it won’t make the engine more fuel economic either.
There doesn’t have to be any emission. Just keep temperatures below 1500 degrees C and not a single NOx molecule will form. Temperatures are kept low by keeping the compression low or by using water injection. Or make sure there’s no excess oxygen present by using rich mixtures or using EGR, then hydrogen will consume it all, and nitrogen won’t be able to bind with oxygen.
If you do have excess oxygen, and temperatures above 1500 degrees C, NOx will form. You can use a catalytic converter to neutralise it, or use selective catalytic reduction with ammonium. Feeding the NOx back into the engine won’t help anything. It won’t make the engine perform better, it won’t neutralise the NOx, it won’t make the engine more fuel economic either.
There doesn’t have to be any emission. Just keep temperatures below 1500 degrees C and not a single NOx molecule will form. Temperatures are kept low by keeping the compression low or by using water injection. Or make sure there’s no excess oxygen present by using rich mixtures or using EGR, then hydrogen will consume it all, and nitrogen won’t be able to bind with oxygen.
If you do have excess oxygen, and temperatures above 1500 degrees C, NOx will form. You can use a catalytic converter to neutralise it, or use selective catalytic reduction with ammonium. Feeding the NOx back into the engine won’t help anything. It won’t make the engine perform better, it won’t neutralise the NOx, it won’t make the engine more fuel economic either.
There doesn’t have to be any emission. Just keep temperatures below 1500 degrees C and not a single NOx molecule will form. Temperatures are kept low by keeping the compression low or by using water injection. Or make sure there’s no excess oxygen present by using rich mixtures or using EGR, then hydrogen will consume it all, and nitrogen won’t be able to bind with oxygen.
If you do have excess oxygen, and temperatures above 1500 degrees C, NOx will form. You can use a catalytic converter to neutralise it, or use selective catalytic reduction with ammonium. Feeding the NOx back into the engine won’t help anything. It won’t make the engine perform better, it won’t neutralise the NOx, it won’t make the engine more fuel economic either.
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