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Homogeneous Electrocatalytic Reduction of Nitrate by an Iron Complex in Water
Kaye L Kuphal1, Jesse R Stroka1, María Fernanda Lizarazo1
1Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, United States.
None:
An iron complex of the macrocyclic pyridine-(diimine) ligand 2,13-dimethyl-3,6,9,12,18-pentaazabicyclo[12.3.1]-octadeca-1(18),2,12,14,16-pentaene (FeN 5 H 2 ) is demonstrated as a homogeneous electrocatalyst in a system with a mercury working electrode for multielectron nitrate reduction in buffered water near neutral pH. At -1.4 V vs Ag/AgCl (1 M KCl), the primary products detected are hydroxylamine (15% Faradaic efficiency) and ammonium (40% Faradaic efficiency), along with small quantities of nitrous oxide. MOPS (3-(N-morpholino)-propanesulfonic acid) buffer is shown to enhance activity unless present at high concentrations.
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