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EncyclopediaHaber processHaber process (hä'bur) [key], commercial process for the synthesis of ammonia, NH3. Pure hydrogen and nitrogen gases are mixed in the appropriate proportion, heated to between 450°C and 600°C, compressed to about 1,000 atmospheres pressure, and passed over a catalyst. The reaction is 3H2+N2~ 2NH3+heat. The ammonia gas is liquefied by rapid cooling; unreacted nitrogen and hydrogen are returned to the reaction chamber. This process, developed by Fritz Haber in 1909, was the first commercially important high-pressure chemical process. The Columbia Electronic Encyclopedia, 6th ed. Copyright © 2007, Columbia University Press. All rights reserved. More on Haber process from Infoplease:
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