摘要
采用TG-DTG-DSC(热重-微分热重-差示扫描量热)热分析联用技术研究了我国昆明2007年C2F烟叶的热失重过程,考察了热解气氛中氧气浓度、升温速率对样品热失重过程的影响。结果表明:在氧气气氛中烟草样品的热降解主要包括5个热失重阶段,热解气氛中氧气的浓度对第一、二两个热失重阶段没有明显的影响,而对后面的几个热失重阶段尤其是主反应区产生了较大的影响;同时,升温速率对样品热失重过程的影响也是明显的,随着升温速率的提高,TG曲线具有向高温区移动的趋势,在相应的DTG曲线上的最大热失重峰值温度也会随加热速率的提高而移向高温区。
The thermal decomposition processes of Kunming＇s C2F tobacco leaf produced in 2007 were investigated by employing the TG-DTG-DSC thermal analysis technology. The effects of oxygen concentrations and heating rates on the thermal decomposition of sample were also explored. The results indicated that the thermal degradation of tobacco sample mainly included five steps in Oxygen atmosphere. The oxygen concentrations had no observable impact on the first and second thermal decomposition stages, but had obvious effects on latter several steps, especially on the main reaction zones. On the other hand, the effects of heating rates on the thermal decomposition of sample were also very obvious. With increasing of heating rates, TG curves moved to the high temperature zone, and the change trend of the biggest peak temperatures on the corresponding DTG curves had also similar to those of TG curves.
出处
《广东化工》
CAS
2011年第8期53-54,共2页
Guangdong Chemical Industry
关键词
烟草
氧气浓度:热失重
tobacco
oxygen concentration
thermal decomposition
