摘要
利用热重红外分析仪（TG-FTIR）对木质素进行热重分析及主要气相产物分析;并探讨了升温速率和碱金属盐对木质素热解过程的影响规律。结果表明：随着升温速率的增加,挥发分析出阶段DTG曲线的峰型变宽,热解起始温度、最大失重峰温均向高温侧移动;且较高的升温速率不利于气相产物的析出。添加碳酸钠、碳酸钙和碳酸钾对木质素热解主反应区反应速率的影响较小,相比碱金属盐的加入量而言,最终热解固体产物略有增加;同时碱金属盐的添加对气相产物的析出有明显抑制作用。与其他两种碱金属盐相比,碳酸钙的加入对600-700℃温度区间内木质素热解产生的CO和CO2产量有一定的促进作用。
Thermogravimetric analysis-Fourier transform infrared spectromerer（ TG-FTIR） was applied to analysis the thermogravimetric and main gas products of alkali lignin pyrolysis. The heating rate and loaded alkali metal salts how to influence lignin pyrolysis processes were studied. The results show that： with the increasing of heating rate,the DTG curves of volatility phase become wider,the onset temperature and the maximum weight peak temperature move to the higher temperature side. The slow heating rate is of great benefit to gas products. It is found that the Na,Ca and K salts additive have a promoting effect on the formation of char,but they get the less CO and CO2 formation in entire temperature range. Compared to the other salt,the Ca salt has advantage on the product of CO and CO2 in the temperature range of 600 - 700 ℃.
出处
《科学技术与工程》
北大核心
2016年第3期225-228,238,共5页
Science Technology and Engineering
关键词
木质素
热解
碱金属盐
气相产物
ignin
pyrolysis
alkali metal salts
gas products
