Critical evaluation of the potential energy surface of the CH3 + HO2reaction system

Molecular Dynamics Study of Combustion Reactions in Supercritical Environment. Part 3: Boxed MD Study of CH3 + HO2 → CH3O + OH Reaction Kinetics

The kinetics of reaction CH₃ + HO₂ → CH₃O + OH in supercritical carbon dioxide media at pressures from 0.3 to 1000 atm in the temperature range (600-1600) K was studied using boxed molecular dynamics simulations at QM/MM theory level with periodical boundary conditions. The mechanism of this process includes two consecutive steps: formation and decomposition of CH₃OOH intermediate. We calculated the activation free energies and rate constants of each step, then used Bodenstein's quasistationary concentrations approximation to estimate the rate constants of the reaction. On the basis of the temperature dependence of the rate constants, parameters in the extended Arrhenius equation were determined. We found that reaction rate of each step, as well as overall reaction, increases with increasing CO₂ pressure in the system. The most effective zone for the process is T = 1000-1200 K, and the CO₂ pressure is about 100 atm.

Kinetics of the unimolecular reaction of CH2OO and the bimolecular reactions with the water monomer, acetaldehyde and acetone under atmospheric conditions

The rate coefficients of the unimolecular reaction of CH₂OO and the bimolecular reactions with the water monomer and carbonyls were measured.

Theoretical kinetic study for methyl levulinate: oxidation by OH and CH3 radicals and further unimolecular decomposition pathways

Biofuels may represent a promising alternative in terms of energy sustainability and emission control.