u_in 0.667[mm/s] Average inlet velocity c_CH4in 50[mol/m^3] Inlet concentration, CH4 c_H2in 0[mol/m^3] Inlet concentration, H2 rho 1[kg/m^3] Density, fluid eta 1e-5[Pa*s] Dynamic viscosity, fluid por0 0.4 Porosity, clean catalyst kappa0 1e-9[m^2] Permeability, clean catalyst rho_soot 4e3[kg/m^3] Density, soot deposits M_C 12.011[g/mol] Molar weight, carbon D_CH4 1e-6[m^2/s] Diffusion coefficient, CH4 D_H2 4e-6[m^2/s] Diffusion coefficient, H2 k_eff 0.1 Effectiveness factor