Originally Posted by
zeus3925
The problem with hydrogen is not the lack of BTUs. It is the most powerful fuel per weight available. It is the favored liquid rocket fuel of NASA. Hydrogen poses several problems if it is going to be employed as a transportation fuel.
Storage is a major problem. Hydrogen is tricky to store. It readily exploits leaks. Driving around with a big thermos bottle of liquid hydrogen is rather impractical. There is some development aimed at developing metal hydrides, but they are not quite ready for prime time.
The infrastructure is lacking for hydrogen use. Right now hydrogen is produced from mainly natural gas. However is the scale of usage goes up then hydrogen could easily be produced from wind, solar, hydro or nuclear energy energy. The number of hydrogen fueling stations are extremely rare, but so are CNG stations as well.
A lot of hype touted hydrogen fuel cells as the new motive power for transportation. However, there were problems with developing a fuel cell stack that would be economical for automotive use. There are still problems with power densities vs. weight as well. But research into fuel cells are on going by several major automakers such as Ford, Daimler-Benz and Honda.
Hydrogen can be burned in a conventional auto engine. Since the manufacturing facilities are in already in place that lack of an appropriate engine should not be a significant factor.
CNG has its own problems. While the infrastructure is better developed for natural gas production, refueling stations are still pretty rare. Like hydrogen it will take a massive investment to develop the refueling points for it to be a major fuel source for common use. Natural gas doesn't like to be compressed. However, the storage of CNG is somewhat less complicated than hydrogen. Refueling times could be an issue. You can't just stick a nozzle in a filler pipe and be on your way in a few minutes.
Both fuels are more environmentally friendly than gasoline. Hydrogen is the champ. CNG is good, but, it still has some carbon emissions. Hydrogen can be produced from the most abundant resource on the planet, water. CNG still requires a hole to be punched into rock and that brings an occasional mishap with it. Natural gas is not a renewable fuel, where hydrogen is, when coupled to a non fossil fueled energy source.
If I were the energy secretary I would tout CNG as the immediate replacement for gasoline, but secondarily continue research and development of hydrogen as alternative