In the conventional combustion process, fuel is combined with air and turned. The result is carbon dioxide, water vapor and heavy oxides of nitrogen, which are a prime cause of chemical smog. Last month Cottell divided his time between Washington, in talks with officials of the Federal Energy Office, and Detroit, where he consulted with engineers working to meet the tight 1976 automobile- emission requirements. This file points to a possibly useful technique for those working with water dissociation for the purpose of hydrogen fueled motors. The smaller the particle is, the less energy required to dissociate into consecutively smaller units.
Ultrasonic generators can be both mechanical or electronic in nature.
Of course, that is simply where they are most efficient, they will still transmit other frequencies just as any speaker will. Any method of hybrid method that would create hydrogen at a sufficiently rapid rate, on demand, is far to be preferred.