原位担载Fe_2S_3催化剂煤的热解动力学研究

PYROLYSIS KINETICS OF COAL IN-SITU IN PREGNATED WITH Fe_2S_3

用加压热天平研究了原位担载纳米级Fe2 S3 催化剂的大柳塔次烟煤的加氢热解动力学 ,考查了 2 0MPa氢气氛或氮气氛下原煤及担载催化剂的煤热解失重过程 ,计算了活化能E和指前因子A等热解动力学参数。结果表明 ,煤原位担载Fe2 S3 催化剂后热失重速率比原煤有较大程度的增加 ,最大热解速率的特征温度也比原煤降低。特别是煤在表面活性剂十六烷基三甲基溴化铵溶液中担载Fe2 S3 催化剂后的热解反应速率高于水溶液中担载同样催化剂的热解反应速度。原位担载Fe2 S3 的煤及原煤的热解反应过程符合一级反应动力学。

Pyrolytic reaction kinetics of Daliuta coal (DL) and impregnated in-situ Fe 2S 3 within water and surfactant Hexadecyltrimethyl ammonium bromide (1*#631-Br) on the coal have been studied by Thermogravimetry in a pressurized thermobalance. The TG/DTG profiles were obtained at heating rate of 10℃/min. A comparison for TG/DTG profiles and pyrolytic kinetics parameters were made between raw coal and the coals in-situ leaching by Fe 2S 3 catalyst within water and surfactant 1*#631-Br. Effects of the surfactant on the coal in-situ impregnated with Fe 2S 3 was analyzed, and Zeta potential of the coal in water and the surfactant were determined. And a first order kinetic equation was used for pyrolytic kinetic parameters calculation. The results showed that the coal in-situ loaded Fe 2S 3 catalyst had much lower activation energy than the raw coal, especially activation energy for coal leaching in the surfactant was lower than that within water. The kinetic parameters E and A of raw coal and the coal loaded Fe 2S 3 catalyst were calculated.