Revisiting kinetics of morin oxidation: Surface kinetics analysis

Herein we report on the kinetics aspect of morin oxidation. This is described by the use of the Langmuir-Hinshelwood and modified Mars-van Krevelen kinetic models. The Langmuir-Hinshelwood kinetics model enabled the determination of adsorption constants of morin and peroxide on the surface of the catalyst, K _morin and K _{H 2 O 2} , respectively, surface rates k, and the heterogeneity constants on the catalyst surface for morin and peroxide, respectively. The surface rate for oxidation of morin obtained by the Langmuir-Hinshelwood model was compared to the surface rate obtained using the Mars-van Krevelen model. Both models suggest activation of the substrate on the catalyst surface as depicted by the high surface rates when compared to the rates of disappearance of morin from the solution. However, preliminary findings suggest that the Langmuir-Hinshelwood model describes morin oxidation kinetics better than the modified Mars-van Krevelen model. Overall, this work investigates the kinetics of morin oxidation on an oxygen-rich catalyst and provides experimental data fitting with the Langmuir-Hinshelwood and the modified Mars-van Krevelen kinetic models.