three heating rates (10, 15, 20 C/min). The volatilization of cellulose and hemicellulose (reaction 1 and 2) fall into lower temperature ranges than in nitrogen. In particular, compared to the reaction in nitrogen, reaction 3 involves a higher decomposition rate over a narrow temperature range, possibly due to the presence of oxygen. The forth reaction of char oxidation and a part of the third reaction contribute to the second peak of mass loss rate.