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NH3 Synthesis in the N2/H2 Reaction System using Cooperative Molecular Tungsten/Rhodium Catalysis in Ionic Hydrogenation: A DFT Study
Authors:Dr. Verena Moha  Prof. Dr. Walter Leitner  Dr. Markus Hölscher
Affiliation:Institut für Technische und Makromolekulare Chemie, RWTH Aachen, University, Aachen, Germany
Abstract:The ionic hydrogenation of N2 with H2 to give NH3 is investigated by means of density functional theory (DFT) computations using a cooperatively acting catalyst system. In this system, N2 binds to a neutral tungsten pincer complex of the type [(PNP)W(N2)3] (PNP=pincer ligand) and is reduced to NH3. The protons and hydride centers necessary for the reduction are delivered by heterolytic cleavage of H2 between the N2–tungsten complex and the cationic rhodium complex [Cp*Rh{2‐(2‐pyridyl)phenyl}(CH3CN)]+. Successive transfer of protons and hydrides to the bound N2, as well as all NxHy units that occur during the reaction, enable the computation of closed catalytic cycles in the gas and in the solvent phase. By optimizing the pincer ligands of the tungsten complex, energy spans as low as 39.3 kcal mol?1 could be obtained, which is unprecedented in molecular catalysis for the N2/H2 reaction system.
Keywords:ammonia  density functional calculations  homogeneous catalysis  hydrogenation  nitrogen
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