Elementary reaction mechanism of methylamine oxidation in supercritical water

An elementary reaction model for the supercritical water oxidation (SCWO) of methylamine was proposed, based on a combustion mechanism that involved reactions relevant to NH2CH2O2. A comparison of the predicted results of our proposed model with the experimental data revealed that our model could predict the conversion via the SCWO of methylamine and the effects of temperature and oxygen concentrations on the NH3 selectivity quantitatively well, and also could qualitatively explain the trends of the measured product distribution, especially NH3 as the exclusive nitrogen-containing product of the SCWO of methylamine. This work clarified that the peroxy radical NH2CH2O2, which appears in low-temperature combustion through the reaction of O-2 with CH2NH2, and the relevant elementary reactions and intermediate species had key roles in the SCWO of methylamine.