Temperature-dependence and pressure-dependence of the phenomenological rate coefficients were modeled by solving the one-dimensional master equation (ME) using ab initio based Rice-Ramsperger-Kassel-Marcus (RRKM) theory at the E-resolved (microcanonical) level to predict the microscopic rates. To avoid numerical instabilities and low eigenvalue issues, well truncation was implemented by setting a maximum of 10 for the ratio of the dissociation limit to the temperature. Below this threshold, all energy states were assumed to be Boltzmannpopulated. A temperature grid ranging from 200-3000 K and a pressure grid ranging from 0.001-100 atm have been used.