中文摘要：

采用酶解/温和酸解法提取了棕榈壳和麦秆的木质素（EMALs），利用傅里叶红外光谱（FT-IR）、裂解器-气相色谱质谱联用（Py-GC/MS）和热重-红外联用（TG-FTIR）技术，对两种EMALs的化学结构和热解特性进行了对比研究，并采用Ozawa-Flynn-Wall方法计算了其热解反应的活化能。结果表明，棕榈壳EMAL和麦秆EMAL均为HGS型木质素。500℃下，两种EMALs的热解产物主要包括酚类、酸类和少量的醇类、醛酮类等化合物；棕榈壳EMAL热解酚类产物中H、G、S型单体酚类的比例分别为47.61%、25.64%和17.18%，而麦秆EMAL分别为23.66%、51.90%和15.50%。在热解反应主失重区（200-380℃），棕榈壳EMAL的主失重速率（50.80%/min）低于麦秆EMAL（78.63%/min）；但棕榈壳EMAL热解同时存在肩状失重峰（265℃，27.40%/min），这与其较多H结构产物的释放相关。H型结构产物释放的放热效应降低了棕榈壳EMAL热解初期的活化能（20%，127.92 kJ/mol），同时使其热解过程（20%-80%）的平均活化能（152.32 kJ/mol）低于麦秆EMAL（161.75 kJ/mol）。

英文摘要：

Firstly, lignin of palm kernel shell （PKS） and wheat straw （WS） were isolated by enzymatic/mild acidolysis method （EMAL）. Then the functional groups and thermal decomposition characteristics of the two EMALs were analyzed with Fourier transform infrared spectroscopy （FT-IR）, pyrolysis-gas chromatography/mass spectrometry （Py-GC/MS） and TG-FTIR. At last, the Ozawa-Flynn-Wall method was used to calculate the activation energy of pyrolysis of the two EMALs. FT-IR result show that both PKS-EMAL and WS-EMAL are Type HGS. Phenols, acids, few of alcohols, aldehydes and ketones are detected in volatile products from 500℃ pyrolysis of the two EMALs. Meanwhile, H-type, G-type and S-type phenols with proportions of 47.61%, 25.64% and 17.18% are obtained in phenolic products from PKS-EMAL pyrolysis; while they are 23.66%, 51.90% and 15.50%, respectively, in phenolic products of WS-EMAL. During 200-380℃, the main weight loss rate of PKS-EMAL pyrolysis is 50.80%/min, which is obviously lower than that （78.63%/min） of WS-EMAL. A shoulder peak of 27.40%/min at 265℃ is also observed in PKS-EMAL pyrolysis, which is closely related to release of H-derivatives during PKS-EMAL pyrolysis. The activation energy （127.92 kJ/mol） of PKS-EMAL pyrolysis at a conversion of 20% reduced by the exothermic effect corresponding torelease of H-derivatives, which was the main reason that the average activation energy （152.32 kJ/mol） of PKS-EMAL pyrolysis （20%-80%） was lower than that （161.75 kJ/mol） for WS-EMAL pyrolysis.