How is hydrogen made
♧lanes process: In this process,In small retort filled with small pieces of spongy iron and steam ,heated towel about 600-800°c .when this process done hydrogen evolved out.
3Fe + 4H2O ---->> Fe3O4 +4H2
Because of it is reversible process ..immediately the hydrogen take out from this retort .
♧Botch and basis check process: In this process , water gas is produce first and then it is pass through steam so high amount of hydrogen is obtained .
C + H2O -----> CO + H2
Then this water gas
CO+H2 + H2O ------>2H2 + CO2
♧By electrolysis of water : Hydrogen is obtained at cathode and oxygen at anode by the electrolysis of water containing 15%of acid or may be base. this method used only where electricity is cheaper .
♧Uyeno's method: In this method , the scrap aluminium is treated with hot caustic soda.
2Al +2NaOH +2H2O ------>2NaAlO2 +3H2
And sodium meta aluminate is soluble in water son hydrogen evolved out easily .
♧As a by product : In manufacture of sodium and caustic soda ; hydrogen dias evolved .
♧Modern method : In modern method , hydrogen is obtained by partial oxidation or cracking of natural gas.
CH4 ----> [1000°c] C +2H2
Or
CH4 + H2O ---->(ni-cr or 800°c) CO +3H2
Or
CO + H2O ------->CO2 +H2
♧Uyeno's method: In this method , the scrap aluminium is treated with hot caustic soda.
2Al +2NaOH +2H2O ------>2NaAlO2 +3H2
And sodium meta aluminate is soluble in water son hydrogen evolved out easily .
♧As a by product : In manufacture of sodium and caustic soda ; hydrogen dias evolved .
♧Modern method : In modern method , hydrogen is obtained by partial oxidation or cracking of natural gas.
CH4 ----> [1000°c] C +2H2
Or
CH4 + H2O ---->(ni-cr or 800°c) CO +3H2
Or
CO + H2O ------->CO2 +H2
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