Abstract In this study, spherical γ-Al2O3-SiO2 catalysts with various Al/Si ratios were prepared by combining the sol-gel and spray pyrolysis (SP) methods. The effectiveness of the product catalysts was then tested via the hydrodeoxygenation (HDO) of guaiacol, a model compound of bio-oil obtained from the pyrolysis of lignocellulosic biomass. Our results showed that the γ-Al2O3-SiO2 catalyst with a 50:50 Al/Si ratio after calcination at 450 °C exhibited the highest guaiacol conversion (81.79%) at a reaction temperature of 300 °C, atmospheric pressure, and a weight hourly space velocity (WHSV) of 6.5 h−1. During guaiacol HDO, the carbon–oxygen cleavage and methyl group transfer reactions occurred on the γ-Al2O3-SiO2 catalyst, which converted the guaiacol into the respective deoxygenated products, including 2,6-xylenol, 2,3,5,6-tetramethyl phenol, pentamethyl benzene, and hexamethyl benzene. The reaction pathways for the conversion of guaiacol HDO were also proposed in this study.

中文翻译：

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使用喷雾热解衍生的球形γ-Al2O3-SiO2 催化剂对木质生物质衍生的生物油模型化合物进行加氢脱氧

摘要 本研究结合溶胶-凝胶法和喷雾热解(SP)法制备了不同Al/Si比的球形γ-Al2O3-SiO2催化剂。然后通过愈创木酚的加氢脱氧 (HDO) 测试产物催化剂的有效性，愈创木酚是一种从木质纤维素生物质热解中获得的生物油模型化合物。结果表明，Al/Si 比为 50:50 的 γ-Al2O3-SiO2 催化剂在 450°C 煅烧后表现出最高的愈创木酚转化率（81.79%），反应温度为 300°C，常压，重量为6.5 h-1 的时空速度 (WHSV)。在愈创木酚 HDO 过程中，γ-Al2O3-SiO2 催化剂发生碳氧裂解和甲基转移反应，将愈创木酚转化为相应的脱氧产物，包括 2,6-二甲苯酚、2,3,5,6-四甲基苯酚，五甲基苯和六甲基苯。本研究还提出了愈创木酚 HDO 转化的反应途径。