摘要
采用差示扫描量热分析仪对我国的一种生物质试样在空气气氛中进行了实验,发现试样从常温到923K高温的低速升温过程中,经历了两步明显的放热过程.对放热机理的分析表明,第一步主要是由半纤维素和纤维素的有氧热解过程控制,第二步放热过程则受木质素热解和炭的氧化反应的共同作用.采用等转化率方法和优化计算方法,对热解过程的动力学模型进行了研究,结果表明,两步连续反应机理可用于描述生物质在空气气氛中热解的放热动力学.
The thermal decomposition of one kind of biomass in air has been investigated by differential scanning calorimetry （DSC） analyzer. The results indicate that the heating process of samples from ambient temperature to 923 K at low heating rates show two obvious exothermic peaks. According to the decomposition mechanism, the first exothermic step is attributed to oxidative degradation of hemicellulose and cellulose, and the second exothermic step is attributed to lignin degradation and char oxidation. The reaction model of the studied biomass thermal decomposition has been studied by iso-conversional methods and optimization computation. The results suggest that the two-step consecutive reaction model is suitable to describe the exotherm of biomass thermal decomposition in air.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2006年第7期786-790,共5页
Acta Physico-Chimica Sinica
基金
国家自然科学基金(50323005
50576090)
973项目(2001CB409600)
教育部新世纪优秀人才支持计划
安徽省优秀青年科技基金(2004-2005)
中国科学技术大学青年基金资助
