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Properties of the elements in ammonia synthesis

Systematic studies about the catal3dic activities of various single metals for ammonia synthesis were first made by Haber, including easily and not easily reduced [Pg.52]

Element Reactivity with N2 Nitride Standard heat of formation/ (kJ-(N-atom)-i, 25°C) Decomposition temperature/ C [Pg.54]

It is obvious that osmium and iron are the most effective elements under the conditions studied by Haber. On the other hand, ruthenium is the most active metal in ammonia decomposition. Since the two reactions are forward and backward steps of the same reaction, the most active metals should be the same, at least near equilibrium. The difference disclosed above is probably caused by some discrepancy in the reaction conditions. The ratio of H2/NH3 in the ammonia synthesis is much higher than that in the ammonia decomposition. Adsorbed N2 and H2 usually become inhibiting species, which depend on the ratio of H2/NH3 ratio. [Pg.55]

See other pages where Properties of the elements in ammonia synthesis is mentioned: [Pg.52]    [Pg.103]    [Pg.109]   


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