Abstract: Using sodium carbonate as catalyst, steam gasification kinetics of four high metamorphosed anthracites （V_ad=2.69%～4.35%）were investigated with isothermal thermogravimetric analysis under ambient pressure.With and without Na₂CO₃ catalyst,the relationships of conversion （x）with reaction time（t）for these anthracites were obtained within the temperature range from 750℃ to 950℃ under reaction control.The shrinkingcore model and modified volumetric model were used to correlate the relations between x and t for the case with Na₂CO₃ as catalyst.The reaction rate constants（k）at different temperatures were determined.The reaction activation energy（E_a）and the pre-exponential factor（k₀）were predicted from the Arrhenius equation.According to the order of k determined by the above two models, the order of activity of the four anthracites was as follows:Yong’an Fengshai coal >Yong’an Jiashai coal >Shangjing coal >Yongding coal.Also, the E_a, ranging from 147.70 kJ·mol^-1 to 199.79 kJ·mol^-1, were estimated by this study.Comparing with the case without catalyst, the E_a and the k₀ of the case with Na₂CO₃ as catalyst were smaller and the catalytic effect was more obvious when the temperature was lower than 850℃.

摘要： 以碳酸钠为催化剂，用热天平的等温热重法研究了4种高变质程度无烟煤（挥发分含量V_ad=2.69%～4.35%）常压下纯水蒸气催化气化反应动力学.在加和不加Na₂CO₃条件下，测定了温度为750～950℃无烟煤的化学反应控制条件下的转化率与时间的关系.加Na₂CO₃的转化率与时间的关系用缩芯模型和修正体积模型进行了良好的拟合关联，得出这4种高变质程度无烟煤水蒸气催化气化反应的反应速率常数、活化能和指前因子，按反应速率常数表示的反应活性大小顺序为：永安丰筛>永安加筛>上京煤>永定煤，活化能范围：147.70～199.79 kJ·mol^-1.与不加催化剂的结果相比，加Na₂CO₃的具有更小的活化能和指前因子，低温（750～850℃）时催化效果更明显.