The impact of alkali and alkaline earth metals on green ammonia synthesis

Alkali Metal Ions Dictate the Structure and Reactivity of an Iron(II) Imido Complex

“…The ability to protonate and alkylate the imido ligand in complexes 2 - 4 but not 5 may have relevance in the context of N 2 functionalization. It is worth noting that that alkali metal additives are important in industrial NH 3 synthesis …”

“…It is worth noting that that alkali metal additives are important in industrial NH 3 synthesis. 48 While protonation of 2−4 with [LutH][Cl] is irreversible, the weaker acid H 2 NDipp establishes an equilibrium with the previously reported bis(anilido) complex 8 (Scheme 3). 31 Here K eq is observed to gradually decrease in the order 5 > 4 > 3 ≈ 2.…”

On the effect of metal loading on the performance of Co catalysts supported on mixed MgO–La2O3 oxides for ammonia synthesis

“…The development of a catalytic system enabling the efficient synthesis of ammonia is thus of great importance and has attracted much interest. 27,[29][30][31][32][33][34] The ammonia synthesis reaction is generally mediated by transition metals (such as Fe, Ru, Os, Mo, Re, Co, Rh) owing to their advantageous combination of occupied and unoccupied dorbitals that can backdonate/accept electrons to/from the N 2 molecule. 29 Currently, the industrial process is carried out over the iron-based catalyst and, to some extent, the ruthenium catalyst.…”

“…27,[29][30][31][32][33][34] The ammonia synthesis reaction is generally mediated by transition metals (such as Fe, Ru, Os, Mo, Re, Co, Rh) owing to their advantageous combination of occupied and unoccupied dorbitals that can backdonate/accept electrons to/from the N 2 molecule. 29 Currently, the industrial process is carried out over the iron-based catalyst and, to some extent, the ruthenium catalyst. Some of their limitations, such as the low activity in the high conversion region for the former and high price and high requirements for the purity of synthesis gas for the latter, cause that research is still ongoing to develop alternative catalysts.…”

“…The development of a catalytic system enabling the efficient synthesis of ammonia is thus of great importance and has attracted much interest. 27,29–34…”