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This method involves cracking ammonia gas with ammonia cracker units. Raw ammonia gas stored in a cylinder is passed through a nickel catalyst at a high temperature. Ammonia gas cracks at approximately 850 deg. C to 900 deg. C on a nickel catalyst. When this happens, ammonia dissociates into nitrogen and hydrogen. We also use PSA molecular sieves to ensure the production of pure hydrogen. The hydrogen produced is 99.999% pure.

Approximately 100 ppm of uncracked ammonia is present even in the cracked gas, with a dew point of -(30) degrees. Gas purification units are installed to obtain a dew point of -(70) degrees. This also helps in removing uncracked ammonia gas. The cost of hydrogen that is generated in these plants is very nominal (around Rs. 4.00 per cubic meter).