Ostwald process

The Ostwald process is a process for manufacturing nitric acid, developed in 1902 by the Latvian-born German physicist Friedrich Wilhelm Ostwald. Ammonia is oxidized by air to nitric oxide at 900°C and 1–8 atmospheres of pressure using a platinum-rhodium catalyst. The nitric oxide is further oxidized to nitrogen dioxide, which is dissolved in water to give 60% nitric acid.