Abstract The catalytic pyrolysis characteristics of palm shell were investigated using pyrolysis-gas chromatography/mass spectrometry (py-GC/MS) and pyrolysis photoionization mass spectrometry (py-PIMS) methods. Temperature-programmed results and time-evolved profiles of major products, such as alkenes, aromatics, furans, and phenols were measured. Temperature and catalysts can effectively influence the pyrolysis products distribution. Two peaks of temperature-programmed results of furfural indicated that hemicellulose and cellulose depolymerized at different temperatures. Two decomposition pathways of lignin were proposed: the ether linkages between monomer units of lignin and the methoxy groups on the aromatic rings would break at different temperatures. With the presence of HZSM-5, the yields of alkenes and aromatics increased and that of oxygenates reduced because primary oxygenates from pyrolysis underwent catalytic deoxygenation and cracking to form light alkenes, which subsequently react with furans or other large alkenes to produce aromatic hydrocarbons. The catalytic effect was intensified as the HZSM-5-to-palm shell mixing ratio was increased. Deoxygenation index shows the maximum deoxygenation occurred in palm shell/HZSM-5 ratio = 1:2 at 500 °C.

中文翻译：

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用气相色谱/质谱法和光电离质谱法探索棕榈壳在 HZSM-5 上的催化热解

摘要 采用热解-气相色谱/质谱（py-GC/MS）和热解光电离质谱（py-PIMS）方法研究了棕榈壳的催化热解特性。测量了主要产品（如烯烃、芳烃、呋喃和苯酚）的程序升温结果和随时间变化的曲线。温度和催化剂可以有效地影响热解产物的分布。糠醛的两个程序升温结果表明半纤维素和纤维素在不同温度下解聚。提出了木质素的两种分解途径：木质素单体单元与芳环上的甲氧基之间的醚键在不同温度下会断裂。随着 HZSM-5 的存在，烯烃和芳烃的产率增加，而含氧物的产率降低，这是因为热解的初级含氧物经过催化脱氧和裂解形成轻质烯烃，然后与呋喃或其他大烯烃反应生成芳烃。随着 HZSM-5 与棕榈壳混合比的增加，催化作用得到加强。脱氧指数显示棕榈壳/HZSM-5 比率 = 1:2 在 500 °C 时发生的最大脱氧作用。