Klason法木质素慢速热解特性及其动力学机理研究
发布时间：2019-01-07 16:48
【摘要】：运用Klason法从4种不同生物质中制备木质素,采用元素及红外分析对不同木质素的化学结构进行表征,运用TG-FTIR研究不同来源木质素慢速热解特性的影响,发现不同来源的木质素热解过程表现为两个主要失重阶段,对应芳香族类化合物的析出与小分子气体的析出过程;其中枫木木质素的热解活性较高,可在较低的温度点(378℃)达到失重最大速率,这与其含有丰富的甲氧基结构有关。在实验分析的基础上建立分阶段反应动力学模型,计算其在不同热解阶段的动力学参数,发现第一阶段活化能主要在19.95~33.66 k J/mol之间,热解第二阶段的活化能在34.82~48.99 k J/mol之间。
[Abstract]:Lignin was prepared from four kinds of biomass by Klason method. The chemical structure of lignin was characterized by elemental and infrared analysis. The effect of slow pyrolysis of lignin from different sources was studied by TG-FTIR. It was found that the pyrolysis process of lignin from different sources showed two main weightlessness stages, corresponding to the precipitation of aromatic compounds and the precipitation of small molecular gases. Among them, maple lignin has higher pyrolysis activity and can reach the maximum weight loss rate at lower temperature (378 鈩，
本文编号：2403893
[Abstract]:Lignin was prepared from four kinds of biomass by Klason method. The chemical structure of lignin was characterized by elemental and infrared analysis. The effect of slow pyrolysis of lignin from different sources was studied by TG-FTIR. It was found that the pyrolysis process of lignin from different sources showed two main weightlessness stages, corresponding to the precipitation of aromatic compounds and the precipitation of small molecular gases. Among them, maple lignin has higher pyrolysis activity and can reach the maximum weight loss rate at lower temperature (378 鈩，
本文编号：2403893
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