It doesn't. The membrane "cracks" the ammonia into N2 and H2. The N2 is released to the atmosphere. The H2 is used in a hydrogen fuel cell to power an electrica

It doesn't. The membrane "cracks" the ammonia into N2 and H2. The N2 is released to the atmosphere. The H2 is used in a hydrogen fuel cell to power an electrical drivetrain or in an internal combustion engine with a mechanical drivetrain.