Abstract In the present study, a novel route of upgrading lignin pyrolysis vapor to aromatic hydrocarbons was investigated. Guaiacol was used as model compound to investigate the coupling conversion of pyrolysis vapor and methanol. Co-feeding methanol obviously facilitated the conversion of guaiacol to aromatic hydrocarbons and inhibited coke formation. HZSM-5, Al-MCM-41 and γ-Al 2 O 3 catalysts were screened, and γ-Al 2 O 3 showed the best catalytic activity for the catalytic co-cracking reaction due to the appropriate acid property. The effects of methanol to guaiacol molar ratio, reaction temperature and W/F guaiacol on product distribution over γ-Al 2 O 3 were studied in a fixed bed reactor to reveal the reaction mechanism. As hydrogen donor, the co-fed methanol promoted the deoxygenation of guaiacol. The water formed through methanol dehydration was an efficient agent for attenuating coke deposition. The highest yield of aromatic hydrocarbons was 81.2% when the methanol to guaiacol molar ratio was 25 at 400 °C. The investigation of W/F guaiacol indicated that the synergistic effect of co-feeding was sensitive at lower W/F guaiacol . Co-feeding methanol with phenol, anisole and the phenolic mixture were also investigated, and high yields of aromatic hydrocarbons were obtained, which demonstrated that co-feeding methanol was a promising process for upgrading complicated pyrolysis products.

中文翻译：

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通过在γ-Al 2 O 3 上共进料甲醇将生物衍生的酚类化合物转化为芳烃

摘要 在本研究中，研究了一种将木质素热解蒸气升级为芳烃的新途径。愈创木酚被用作模型化合物来研究热解蒸气和甲醇的耦合转化。共进料甲醇明显促进愈创木酚转化为芳烃并抑制焦炭的形成。筛选出HZSM-5、Al-MCM-41和γ-Al 2 O 3 催化剂，γ-Al 2 O 3 由于合适的酸性，对催化共裂化反应表现出最好的催化活性。在固定床反应器中研究了甲醇与愈创木酚摩尔比、反应温度和W/F愈创木酚对γ-Al 2 O 3 产物分布的影响，以揭示反应机理。作为氢供体，共同供给的甲醇促进愈创木酚的脱氧。通过甲醇脱水形成的水是减轻焦炭沉积的有效剂。当甲醇与愈创木酚摩尔比为 25 在 400 °C 时，芳烃的最高产率为 81.2%。对W/F愈创木酚的研究表明，在较低W/F愈创木酚的情况下，共同饲喂的协同效应是敏感的。还研究了甲醇与苯酚、苯甲醚和酚类混合物共同进料，获得了高产率的芳烃，这表明共同进料甲醇是一种有前途的复杂热解产物升级的方法。对W/F愈创木酚的研究表明，在较低W/F愈创木酚的情况下，共同饲喂的协同效应是敏感的。还研究了甲醇与苯酚、苯甲醚和酚类混合物共同进料，获得了高产率的芳烃，这表明共同进料甲醇是一种有前途的复杂热解产物升级的方法。对W/F愈创木酚的研究表明，在较低W/F愈创木酚的情况下，共同饲喂的协同效应是敏感的。还研究了甲醇与苯酚、苯甲醚和酚类混合物共同进料，获得了高产率的芳烃，这表明共同进料甲醇是一种有前途的复杂热解产物升级的方法。