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Manufacture of Nitric Acid by Ostwald's process

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Nitric acid is prepared in large scale from ammonia and air (Fig.6.14).

Pure dry ammonia (1 volume) and air (10 volumes)

1) 1^s^t step - Catalytic oxidation of ammonia to form nitric oxide

2) 2ⁿ^d step - Oxidation of nitric oxide to nitrogen dioxide.

3) 3^r^d step - Absorption of nitrogen dioxide in water to give nitric acid.

Platinum (for oxidation of )

700^o - 800^oC

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