The ignition behavior of an enclosed stoichiometric methane/air mixture in the presence of carbonaceous particles was studied by means of a one-dimensional numerical model composed of the reactive Navier-Stokes equations for the gas phase and the reactive Euler equations for the particle phase. Both phases are considered to be continuously distributed. For the homogeneous gas-phase reactions, a detailed kinetic model has been chosen, whereas the gas/particle reactions are described by global heterogeneous reactions. The system of equations is treated by TVD flux difference splitting schemes on a moving adaptive grid solved by an implicit integrator. Simulation results for a particle volume fraction of 7.9×10 −5 demonstrate that the heat absorbing particles cause an increase in ignition delay time. Moreover, the model used predicts that the gas/particle reactions increase the CO molar fraction in the burned gas region, while the CO 2 fraction is lower than in the pure gas case. For the case studied, the particles only weakly influence the shapes of pressure, temperature, and HO 2 molar fraction.