Direct, in situ determination of pH and solute concentrations in formic acid dehydrogenation and CO2 hydrogenation in pressurised aqueous solutions using 1H and 13C NMR spectroscopy

Abstract

In water, spin–lattice relaxation times (T₁) and calibration curves for chemical shifts have been determined for the ¹³C and the ¹H(C) atoms in HCOOH, HCOONa, CO₂, Na₂CO₃ and NaHCO₃ by NMR spectroscopy. These data facilitate kinetic and mechanistic studies for H₂ storage/delivery in the carbon dioxide–formic acid systems under H₂ and CO₂ pressures.