Abstract The application of hierarchical HZSM-5 zeolite catalysts in the catalytic fast pyrolysis (CFP) of lignin was investigated using a pyrolyzer coupled with gas chromatography-mass spectrometry (Py-GC–MS). A series of modified HZSM-5 zeolites were prepared by the post-treatment desilication of commercial HZSM-5 zeolite with varying concentrations of sodium hydroxide (NaOH) solutions (0.1 – 0.5 mol/L) and the following solutions: 0.3 mol/L of sodium aluminate (NaAlO2), 0.3 mol/L of sodium carbonate (Na2CO3), and 0.3 mol/L of tetrapropylammonium hydroxide (TPAOH). The catalyst samples were characterized by XRD, XRF, TEM, N2 adsorption–desorption, and NH3-TPD techniques. The crystallinity, the SiO2/Al2O3, the morphology, the pore properties, and the density of acid sites of the HZSM-5 zeolites were changed after alkali treatment. The alkali treatment improved the catalytic performance of HZSM-5 zeolite for cracking bulky oxygenates released from lignin (such as guaiacol, syringol, and their derivatives from the pyrolysis of lignin) to produce aromatic hydrocarbons. The HZSM-5 zeolite treated with 0.3 mol/L NaOH was the optimal choice for the catalytic fast pyrolysis of lignin for producing aromatic hydrocarbons.

中文翻译：

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碱性溶液后处理分级HZSM-5沸石催化木质素热解

摘要 使用与气相色谱-质谱联用 (Py-GC-MS) 联用的热解器研究了分级 HZSM-5 沸石催化剂在木质素催化快速热解 (CFP) 中的应用。通过使用不同浓度的氢氧化钠 (NaOH) (0.1 – 0.5 mol/L) 溶液和以下溶液对商用 HZSM-5 沸石进行后处理脱硅，制备了一系列改性 HZSM-5 沸石：0.3 mol/L铝酸钠 (NaAlO2)、0.3 mol/L 碳酸钠 (Na2CO3) 和 0.3 mol/L 四丙基氢氧化铵 (TPAOH)。催化剂样品通过 XRD、XRF、TEM、N2 吸附-解吸和 NH3-TPD 技术进行表征。碱处理后HZSM-5沸石的结晶度、SiO2/Al2O3、形貌、孔隙性质和酸位密度发生变化。碱处理提高了 HZSM-5 沸石的催化性能，用于裂解木质素释放的大量含氧化合物（如愈创木酚、紫丁香醇及其从木质素热解得到的衍生物）生产芳烃。用0.3 mol/L NaOH处理的HZSM-5沸石是木质素催化快速热解生产芳烃的最佳选择。