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对纤维素、半纤维素、木质素及3者不同配比的自配生物质样品进行了热重分析与热解-气象色谱-质谱试验。分析了这3种生物质组分与ZSM-5分子筛进行催化热解反应时的相互影响。结果表明尽管纤维素、半纤维素、木质素初级热解产物不同,但在与ZSM-5分子筛催化热解时最终产物基本一致,主要是芳烃类化合物。然而,木质素组分在催化剂表面形成大量积炭并导致催化剂失活。因此木质素组分会影响纤维素与半纤维素组分在催化热解中的转化,导致生物质的整体转化效率下降,并且抑制作用随木质素含量的提高和反应时间的延长而增强。研究结果表明需要对木质素含量较高的生物质进行预处理,选择性去除木质素,提高生物质整体转化效率,降低催化剂失活。
Thermogravimetric analysis and pyrolysis - gas chromatography - mass spectrometry were carried out on cellulose, hemicellulose, lignin and three self - formulated biomass samples with different ratios. The interaction between the three biomass components and ZSM-5 zeolite for catalytic pyrolysis was analyzed. The results showed that although the primary pyrolysis products of cellulose, hemicellulose and lignin were different, the final products were basically the same with the catalytic pyrolysis of ZSM-5 zeolite, mainly aromatic compounds. However, the lignin component forms a large amount of carbon deposition on the catalyst surface and leads to deactivation of the catalyst. Thus, the lignin component affects the conversion of cellulose and hemicellulose components during catalytic pyrolysis, resulting in a decrease in the overall conversion efficiency of the biomass and an increase in inhibition as the lignin content increases and the reaction time lengthens. The results indicate that it is necessary to pretreat biomass with high lignin content, selectively remove lignin, increase overall biomass conversion efficiency and reduce catalyst deactivation.