Mass balance was imposed for the gas and adsorbed phases (Equation S5). The rate of change in the concentration of the adsorbed phase was modelled as a linear restorative term proportional to K eff (Equation ) towards the equilibrium concentration (Equation S1). The energy balance at the gas and adsorbed phases, outer walls and external heat transfer fluid is described in Equation S6. The momentum balance is modelled using the Ergun equation (Equation S7) and the total pressure at each point is determined using the ideal gas law.