摘要
利用热重分析在不同升温速率(5～50 K/min)和氮气气氛下对核桃壳的热解失重行为进行了研究。实验结果表明,核桃壳的热解过程可分为失水干燥、预热解、快速热解和残余物缓慢分解等4个阶段;快速热解阶段和残余物缓慢分解阶段的失重率分别为55%和32%左右,它们均可由一级反应过程描述,根据一级反应由Coats-Redfern方法计算核桃壳快速热解阶段和残余物缓慢分解阶段的平均活化能分别为50.7和17.3 kJ/mol。实验结果还表明加热速率越大,热解速率越快。
The pyrolysis characteristics of walnut shell at different heating rates （5-50 K/min） under the stream of N2 were studied using thermogravimetric analysis. The result showed that the pyrolysis process of walnut shell included four stages, namely drying, pre-pyrolysis, fast-pyrolysis and slow decomposition of residue. The weight loss during the fast-pyrolysis stage and the slow decomposition stage of residue was about 55 % and 32 %, respectively. The pyrolysis process could be described by the first-order global model for both fast-pyrolysis and slow decomposition stages. With the method of Coats-Redfern, the average activation energy was 50.7 and 17.3 kJ/mol for both pyrolysis stages, respectively. The pyrolysis speed increases with increasing of heating rate.
出处
《林产化学与工业》
EI
CAS
CSCD
北大核心
2010年第2期6-10,共5页
Chemistry and Industry of Forest Products
基金
国家自然科学基金资助项目(30800867)
"十一五"国家科技支撑计划资助(2006BAD19B06)
教育部科学技术研究重点项目(209117)
中国博士后科学基金项目(20080430465)
关键词
核桃壳
热解
热重分析
动力学
walnut shell
pyrolysis
thermogravimetric analysis
kinetics
