基于TG-FTIR-MS技术的烟叶角质层热解行为研究

Study on Pyrolysis Behavior of Tobacco Cuticle Based on TG‐FTIR‐MS

为探究烟叶角质层热解行为及其在热解过程中气相产物释放规律,采用酶法、化学方法分离烟叶角质层,通过扫描电子显微镜和傅里叶红外光谱仪对其进行表征分析,利用热重-傅里叶红外光谱-质谱(TG-FTIR-MS)联用技术检测角质层的热释放行为和热解产物。结果表明,采用酶法和化学方法均可分离烟叶角质层,烟叶角质层的热解可分为失水(50~135℃)、快速脱挥发分(135~595℃)和碳化(595~900℃)3个阶段,其热解产生的气体成分主要包括CH_(4)和CO_(2),气态产物多集中在300~600℃温度区间,其中以羧酸类化合物和甲苯居多。苯系物在250℃左右开始产生,在500~540℃温度区间内达到峰值,而尼古丁的生成量则相对较少。

In order to study the pyrolysis behavior of tobacco cuticle and the release law of gaseous products during pyrolysis,the cuticle of tobacco leaves was separated by enzyme and chemical methods,and then were characterized by scanning electron microscope and Fourier infrared spectroscopy.The thermal release behavior and pyrolysis products of the cuticle were detected using TG‐FTIR‐MS coupling technology.The results showed that the cuticle could be separated by enzymatic and chemical methods.The pyrolysis of the cuticle could be divided into three stages:dehydration(50—135℃),rapid devolatilization(135—595℃)and carbonization(595—900℃).The main gas components produced by pyrolysis included CH_(4) and CO_(2),and the gas products were mainly concentrated in the temperature range of 300—600℃,among which the carboxylic acids and toluene were the most.With the increase of temperature,the production of benzene series began at about 250℃and reached the peak at 500—540℃,while the production of nicotine was relatively smaller.