椰壳纤维的热解动力学分析

摘要

Coconut fibers were treated with different chemical agents, such as NaOH, KOH, ZnCl2, and rn(NH4)2 HPO4 and thermal gravimetric analysis with STA449C-Jupiter simultaneous thermal analyzer( NETZSCH,rnSTA449C-Jupiter). Integration method was used in kinetic calculation and analysis. The experiment results show that rnthe lowest activation energy of the main pyrolysis reaction was obtained at the heating-rate of 5K/min, which was bernnefit to the pyrolysis reactions of coconut fiber. And the activation energy value at low temperature and high temperarnture section were 30. 52kJ/mol and 56. 44k J/mol, respectively. The hemicelluloses, pectin and other components derngraded easily were removed when the coconut fiber immersed in 5％ of the alkali solution, thus changing the coconut rnfiber pyrolysis reactions.%将椰壳纤维在NaOH、KOH、ZnCl2和(NH4)2HPO4溶液中进行处理,并采用耐驰STA449C-Jupiter同步热分析仪研究了椰壳纤维在不同升温速率时的热分解反应.通过积分法对椰壳纤维的热解失重曲线进行动力学分析发现,升温速率为5K/min时热解的主反应阶段的活化能最低,低温段和高温段的分别为30.52kJ/mol、56.44kJ/mol,对椰壳纤维的热解反应最有利.采用5%的碱溶液浸泡处理可以有效除去椰壳纤维中的半纤维素、果胶等易降解的成分,改变热解反应过程,从而更有利于制备活性炭纤维.