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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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生物油重质组分模型物热解行为及其动力学研究
, PP. 198-206
Keywords: 生物油重质组分,模型物,热解特性,动力学
Abstract:
？采用tg-ft-ir在非等温条件下对生物油重质组分酚、醛和糖类模型代表物(丁香酚、香草醛、左旋葡聚糖)进行热解特性及其热解动力学分析。tg-dtg曲线和ft-ir测试数据显示,重质组分模型物热解的先后次序是酚类、醛类、糖类物质。香草醛、丁香酚均为一个主热解阶段,主要产物为水、烷烯烃、co2、co和小分子酚、芳香醛。左旋葡聚糖热解分两阶段进行,热解发生在较高温区(180~370℃),主要热解产物有co2、烷烯烃、醛、酮和环醚,少量的co和水。混合物热解分为三个阶段,产物与单一模型物热解产物相似,但有少量缩醛低聚物。对比单一组分,混合物中羰基和羟基组分在较高温区(≥300℃)存在相互作用,生成难分解的缩聚物。其中,糖类是影响重质组分热解速率的主要物质。根据热重数据对热解各阶段进行动力学拟合,确定了模型物热解反应动力学三因素。平均表观活化能和反应级数分别为:e左旋葡聚糖第一、第二阶段分别为115.80kj/mol(0.5级)、141.19kj/mol(2/3级);e混合物第一阶段为54.46kj/mol(1级)、第二阶段为50.67kj/mol(2/5级);e丁香酚为42.29kj/mol(0.7级);e香草醛为36.53kj/mol(0.95级)。
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