为优化玉米芯水解残渣低温热解、ZnCl2活化制备活性炭的工艺过程,获取活化过程的优化工艺参数,在热分析仪上对残渣热解焦的ZnCl2活化过程进行了研究.通过对比ZnCl2溶液浸渍前后残渣热解焦的热重特性,分析了ZnCl2活化机理,采用分布活化能模型(DAEM)对浸渍热解焦活化过程进行了动力学分析.结果表明,经ZnCl2浸渍后的残渣热解焦热失重区间集中在450～650℃,且失重峰明显增强,固体残留质量大幅降低.DAEM计算结果表明,浸渍热解焦在活化过程中的活化能分布为190～280 k J/mol,在E=210kJ/mol时活化能分布函数达到最大值.%In order to obtain optimal technical parameters of activated carbon prepared from corncob hydrolysis residues (CHR) based on pyrolysis at low temperature and ZnCl2 activation process, activation behaviour of CHR char impregnated with ZnCl2 solution was investigated by using ther-mogravimetric analyzer (TGA). The ZnCl2 activation process of impregnated char was analyzed by distributed activation energy model (DAEM). The results showed that "sharp mass loss stage" for the impregnated char with ZnCl2 was concentrated at 450-650 °C, and the solid residue was reduced when the massloss peak strengthened. It was demonstrated by DAEM that activation energy (E) of the impregnated char during activation was between 190-280 kJ/mol, and Energy Distribution Functions reach maximum at E=210 kj/mol.
展开▼
