In order to analyze the thermal decomposition of MT based pyrolant in nitrogen and air environments,the thermal analysis experiments of MT and MTV pyrolants were carried out by TG-DTA and DSC.The results show that,in ...In order to analyze the thermal decomposition of MT based pyrolant in nitrogen and air environments,the thermal analysis experiments of MT and MTV pyrolants were carried out by TG-DTA and DSC.The results show that,in nitrogen environment,the spectrum result of Grignard-type reaction~[6] is verified by the decomposition characteristics of MT and MTV pyrolants.8.71% of Mg is consumed in the intermediate reaction of MT at 500-596 ℃ and the heat release of reaction is 31.93 k J/g.The endothermic decomposition of the intermediate product is at 684-740 ℃.In MTV,the intermediate reaction is at 435-595 ℃ and the heat release of reaction are increased by the addition of fluororubber.The intermediate product degrades at 677-745 ℃.In air environment,the decomposition of MT and MTV show the different reaction mechanism from the nitrogen environment.The presence of oxygen is involved in the reaction of Mg,and inhibits the intermediate reaction process of Mg and PTFE.展开更多
采用核磁共振碳谱(nuclear magnetic resonance spectra,13C-NMR)对生物质的三种最主要组分纤维素、半纤维素及木质素的化学结构特性进行研究,结果表明纤维素中的脂碳与芳碳比明显高于半纤维素和木质素,分别为5.2∶1、1.9∶1和1∶1.2,...采用核磁共振碳谱(nuclear magnetic resonance spectra,13C-NMR)对生物质的三种最主要组分纤维素、半纤维素及木质素的化学结构特性进行研究,结果表明纤维素中的脂碳与芳碳比明显高于半纤维素和木质素,分别为5.2∶1、1.9∶1和1∶1.2,这直接导致了三种组分热解产物的差异。该文在前人研究的基础上建立适用于生物质组分化学结构的化学渗透脱挥发分(chemical percolation for devolatilization,CPD)模型,通过13C-NMR对生物质各组分的化学结构进行研究,得到CPD模型的4个输入参数;并预测了纤维素、半纤维素及木质素这三种组分的热解产物产量。根据各组分在生物质原样中所占比例,计算出松木屑热解的产物产量。展开更多
基金Sponsored by the National Natural Science Foundation of China(Grant No.51076066)
文摘In order to analyze the thermal decomposition of MT based pyrolant in nitrogen and air environments,the thermal analysis experiments of MT and MTV pyrolants were carried out by TG-DTA and DSC.The results show that,in nitrogen environment,the spectrum result of Grignard-type reaction~[6] is verified by the decomposition characteristics of MT and MTV pyrolants.8.71% of Mg is consumed in the intermediate reaction of MT at 500-596 ℃ and the heat release of reaction is 31.93 k J/g.The endothermic decomposition of the intermediate product is at 684-740 ℃.In MTV,the intermediate reaction is at 435-595 ℃ and the heat release of reaction are increased by the addition of fluororubber.The intermediate product degrades at 677-745 ℃.In air environment,the decomposition of MT and MTV show the different reaction mechanism from the nitrogen environment.The presence of oxygen is involved in the reaction of Mg,and inhibits the intermediate reaction process of Mg and PTFE.
文摘采用核磁共振碳谱(nuclear magnetic resonance spectra,13C-NMR)对生物质的三种最主要组分纤维素、半纤维素及木质素的化学结构特性进行研究,结果表明纤维素中的脂碳与芳碳比明显高于半纤维素和木质素,分别为5.2∶1、1.9∶1和1∶1.2,这直接导致了三种组分热解产物的差异。该文在前人研究的基础上建立适用于生物质组分化学结构的化学渗透脱挥发分(chemical percolation for devolatilization,CPD)模型,通过13C-NMR对生物质各组分的化学结构进行研究,得到CPD模型的4个输入参数;并预测了纤维素、半纤维素及木质素这三种组分的热解产物产量。根据各组分在生物质原样中所占比例,计算出松木屑热解的产物产量。
