Journal
PHYSICAL CHEMISTRY CHEMICAL PHYSICS
Volume 12, Issue 40, Pages 13166-13173Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0cp00330a
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Funding
- Deutsche Forschungsgemeinschaft DFG [Sta 511/6]
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The NMR transverse relaxation time T-2, determined by a CPMG multipulse sequence, of aqueous hydrogen peroxide (H2O2) solutions strongly depends on the rate of exchange of the spin-bearing protons between the H2O2 and H2O molecules. For pulse separations exceeding the inverse exchange rate, this value becomes a constant only depending on proton exchange time and magnetic field strength. Since this exchange time depends in a non-analytical way on the concentration of H2O2 and on the pH value, a measurement of T-2 and pH allows the inversion of the data for the non-invasive determination of the H2O2 concentration. The generation of calibration data for a range of concentrations and pH values is presented and is applied to a heterogeneously catalyzed H2O2 decomposition involving commercial catalyst pellets. The evolution of the concentration during the course of reactions is monitored and the long-time deactivation of the pellet is demonstrated using this technique. The method is suggested as a means for contact-free and non-invasive on-line monitoring of H2O2 concentrations.
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