Briefly describe the manufacture of hydrogen by Bosch process
Answers
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BOSCH PROCESS IS USED TO MAKE HYDROGEN
In the Bosch process, large quantities of hydrogen are produced from cheap raw materials such as water and coke. When steam is passed over red hot coke(carbon) at a temperature of about 1200C, a mixture of carbon(II) oxide and hydrogen is produced. Excess steam is then mixed with the water gas[carbon(II) oxide and hydrogen] and passed over a catalyst which could either be iron(III) oxide or chromium(III) oxide, at a temperature of about 450C. The resultant effect is that the carbon(II) oxide in the water gas is converted to carbon(IV) oxide with a further yield of hydrogen.
Answer:
THIS METHOD INVOLVES TWO STAGES:
WHEN SUPER HEATED STEAM IS PASSED THROUGH WHITE HOT COKE OR CHARCOAL AN ENDOTHERMIC REACTION TAKES PLACE WITH THE FORMATION OF A MIXTURE OF EQUAL VOLUMES OF CARBON MONOXIDE GAS AND HYDROGEN COMMONLY CALLED WATER GAS .
THE WATER GAS SO FORMED IS MIXED WITH TWICE THE VOLUME OF SUPER HEATED STEAM AND PASSED OVER A MIXTURE OF FERRIC OXIDE AND CHROMIUM OXIDE AT 450DEGREE C -500DEGREE C WHEN CARBON MONOXIDE IS OXIDISED TO CARBON DIOXIDE .THIS REACTION IS CALLED WATER GAS SHIFT REACTION