作　　者： ; ; ;

机构地区： 中国科学院

出　　处： 《太阳能学报》 2010年第12期1537-1542,共6页

摘　　要： 为考察钾元素及其存在形态对生物质热解特性的影响,实验用不同浓度的KAc和KCl溶液浸渍微晶纤维素,其热重结果表明,钾能促进纤维素低温分解、降低热解反应速率并使固体焦产率增加,能降低纤维素热解的表观活化能,活化能随钾添加量的增加而降低。通过对KCl、KAc浸渍纤维素的热重-红外(TG-FTIR)分析结果表明,钾能使纤维素热解向低小分子产物转化,但其作用能力受到添加盐种类的影响,KAc对热解反应温度、产物的影响显著大于KCl,使纤维素热解分为两段,而KCl的作用能力易受到添加量的限制。生物质中以有机结合态存在的钾对热解的过程的影响大于以无机态存在的钾。 In order to understand the effect of potassium on the pyrolysis characteristics of the biomass, microcrystalline cellulose（mcc） loaded KCl or KAc with different concentrations were investigated by thermogravimetric analysis. The results show that potassium can catalyze pyrolysis process, increase the char yields markedly, shift the pyrolysis process to lower temperature, and increase the light organic fraction in volatile components. The analysis results of products by means of Fourier transform infrared spectroscopy （TG-FTIR） indicate that potassium can lower the average apparent firstorder activation energy for pyrolysis. The catalysis of KCl is relatively weak compared to KAc, and the catalysis is limited when the added concentration is low. The organically bound potassium may catalyze pyrolysis of biomass more than the inorganically potassium in biomass.

关 键 词： 纤维素 热解 钾 热重 红外

领　　域： [动力工程及工程热物理]