Abstract
The formation and stability of an ammonia synthesis catalyst, based on cobalt molybdenum nitrides, were studied. The activation process of the catalyst was examined by in situ X-ray diffractometry. The thermal stability of obtained active phase of the catalyst was tested at 700 °C under ammonia atmosphere, N2/H2 mixture and under pure hydrogen. The presence of Co2Mo3N and Co3Mo3N phases in the catalyst was confirmed. The phase composition was stable in a long-term test performed under nitrogen/hydrogen atmosphere. Co3Mo3N phase decomposed into Co6Mo6N after exposure to pure hydrogen.
Highlights
During the twentieth century, world production rate of ammonia has considerably grown
High temperature and pressure required for ammonia synthesis significantly affect world energy consumption
Chemical compounds with cobalt and molybdenum atoms in their structure and reportedly having a high activity in the ammonia synthesis process are cobalt molybdenum nitrides
Summary
World production rate of ammonia has considerably grown. Keywords Cobalt molybdenum nitrides · Ammonia synthesis · Thermal stability Chemical compounds with cobalt and molybdenum atoms in their structure and reportedly having a high activity in the ammonia synthesis process are cobalt molybdenum nitrides. Co3Mo3N obtained via ammonolysis from cobalt molybdate hydrate is more active in ammonia synthesis process than the commercial multi-promoted iron catalyst (Kojima and Aika 2001a).
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