Chromium-modified cobalt molybdenum nitrides as catalysts for ammonia synthesis

Abstract The influence of chromium compounds on the properties of cobalt molybdenum nitrides was studied. CoMoO 4 obtained by precipitation from cobalt and molybdenum salts was modified by the addition of chromium(III) nitrate. A mixture of cobalt-molybdenum nitrides, Co 2 Mo 3 N and Co 3 Mo 3 N, was formed by ammonolysis of modified CoMoO 4 . The concentration of Co 2 Mo 3 N decreases with increasing chromium content. The specific surface area of cobalt molybdenum nitrides consisting of 2 wt% of Cr atoms increased by 50% in comparison to pure cobalt molybdenum nitrides. The catalytic activity of obtained catalysts in ammonia synthesis process decreases with rising of chromium concentration.