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Why is Hydrogen ?


Main idea in the use of hydrogen among other alternative fuels in internal combustion engines is to relize near non-zero emission goal.Since it is a carbon free fuel, hydrogen provides CO2-free combustion in IC engines. Adding 5 % hydrogen to the gasoline provides 30 % to 40 % less NOx emission. An IC engine powered by hydrogen emits water and only trace amounts of CO and HC due to burning of lubricant. 
 

Although this advantage of hydrogen, there are some impediments in using hydrogen in vehicles. 

         Due to the high cost in hydrogen production, hydrogen is presently more expensive than the conventional fuels like gasoline, diesel
         Onboard storage diffucilties 
         Vehicles powered by hydrogen fuel are less energy efficient than vehicles which run on conventional fuels as well natural gas.
         A hydrogen infrastructure will cost hundreds of billions of dollars and take at least 20 years to implement.
         NOx emissions is still problem with Hydrogen, although it is less with hydrogen than that with other fuels.