The role of interstitial species upon the ammonia synthesis activity of ternary Fe–Mo–C(N) and Ni–Mo–C(N) phases

Citrate-gel preparation and ammonia synthesis activity of compounds in the quaternary (Ni,M)2Mo3N (M = Cu or Fe) systems

“…5,6,[30][31][32][33][34] The high activity of the Co 3 Mo 3 N has been linked to the fact that CoMo alloy has an average nitrogen adsorption energy close to the optimal nitrogen binding energy for catalytic performance, 35,36 and to lattice nitrogen activity. 2,7,8,10,11,14,32,37 Activities for Ni 2 Mo 3 N and doped analogues are typically lower than those of Co 3 Mo 3 N-based catalysts despite the structural and electronic similarities between these two systems, and that may be linked at least partly to the lack of lattice nitrogen mobility exhibited by Ni 2 Mo 3 N. 11 Activities observed here are significantly higher than those observed in many other studies of this material and were seen to increase with iron doping, although our activities were measured at 500°C due to a relatively low activity observed at 400°C (ESI, Fig. S29 †).…”

Strong Interfacial Electronic Interaction in the Transition-Metal/Mo2C Catalyst for Enhanced Ammonia Synthesis at Ambient Pressure: Shift of the Rate Determining Step

“…Following is the equation for criterion: Fig S1 (ii)] indicates about the possible insertion/substitution of N atoms in the catalyst structure during ammonia synthesis. 7,18 Table S5. Stoichiometric formula of carbo-nitride of tested catalysts for ammonia synthesis based upon CHN analysis.…”

The reactivity of lattice nitrogen within the Ni2Mo3N and NiCoMo3N phases

“…5,6,[29][30][31][32][33] The high activity of the Co3Mo3N has been linked to the fact that CoMo alloy has an average nitrogen adsorption energy close to the optimal nitrogen binding energy for catalytic performance, 34,35 and to lattice nitrogen activity. 2,[7][8][9][10]13,31,36 Activities for Ni2Mo3N and doped analogues are typically lower despite the structural and electronic similarities between these two systems, and that may be linked at least partly to the lack of lattice nitrogen mobility exhibited by this compound. 10 Activities observed here are significantly higher than those observed in many other studies of this material and were seen to increase with iron doping, although our activities were measured at 500 °C due to a relatively low activity observed at 400 °C (ESI, Fig.…”