The coal-biomass mixed char co-gasification with H2O in the presence of H-2 was investigated under atmospheric conditions using a tube furnace and gas analyzer. Various partial pressures of H2O and H-2 were tested within a temperature range of 825-900 degrees C. Bituminous coal, pineapple sawdust, and a mixture of these two having a mass ratio of 1:1 were used to prepare chars. Random pore model was utilized to explain the experimental results. The results demonstrated that the inhibition effect of H-2 on char-H2O gasification can be described using the Langmuir-Hinshelwood (L-H) equation. The inhibition effect on the mixture sample was more intense than on the pure samples. The L-H equation kinetic parameters were acquired and expressed in an Arrhenius equation form to determine the pre-exponential factor and activation energy. (C) 2016 Elsevier Ltd. All rights reserved.