Abstract Catalytic hydrodeoxygenation (HDO) is a process for removing of oxygen from oxygen-containing compounds using a catalyst. In this study, spherical bimetallic NiMo/Al2O3–TiO2 catalysts with different Ni/Mo ratios were successfully synthesized by combining sol–gel method and continuous flow spray pyrolysis process. The prepared catalysts were characterized by N2 adsorption–desorption, TEM, SEM, XRD, XPS, H2-TPR and NH3-TPD analyses. The catalysts were then applied for HDO of guaiacol as a model compound using a fixed-bed reactor. The effects of bimetallic compositions and reduction temperatures on HDO conversion of guaiacol as well as their product distributions were systematically investigated. The obtained results showed that bimetallic NiMo/Al2O3–TiO2 exhibited higher HDO conversion than monometallic catalysts (Ni/Al2O3–TiO2 or Mo/Al2O3–TiO2). The highest HDO conversion of 98% with 100% hydrocarbon selectivity (85% cyclohexane, 13% methylcyclohexane and 2% toluene) was obtained over (10 wt% Ni and 20 wt% Mo)/Al2O3–TiO2 catalyst. In addition, the catalyst maintained a good catalytic stability for 24 h of reaction time, suggesting that spray pyrolysis derived NiMo/Al2O3–TiO2 catalyst can be a promising catalyst for HDO performance.

中文翻译：

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用于愈创木酚加氢脱氧的双金属NiMo/Al2O3-TiO2催化剂的喷雾热解合成：双金属成分和还原温度的影响

摘要 催化加氢脱氧 (HDO) 是一种使用催化剂从含氧化合物中去除氧气的过程。在这项研究中，结合溶胶-凝胶法和连续流喷雾热解工艺，成功合成了具有不同 Ni/Mo 比的球形双金属 NiMo/Al2O3-TiO2 催化剂。制备的催化剂通过 N2 吸附-解吸、TEM、SEM、XRD、XPS、H2-TPR 和 NH3-TPD 分析进行表征。然后使用固定床反应器将催化剂应用于愈创木酚的 HDO 作为模型化合物。系统地研究了双金属成分和还原温度对愈创木酚的 HDO 转化率及其产物分布的影响。所得结果表明，双金属 NiMo/Al2O3-TiO2 表现出比单金属催化剂（Ni/Al2O3-TiO2 或 Mo/Al2O3-TiO2）更高的 HDO 转化率。在 (10 wt% Ni 和 20 wt% Mo)/Al2O3-TiO2 催化剂上获得了 98% 的最高 HDO 转化率和 100% 的烃选择性（85% 环己烷、13% 甲基环己烷和 2% 甲苯）。此外，该催化剂在 24 小时的反应时间内保持良好的催化稳定性，表明喷雾热解衍生的 NiMo/Al2O3-TiO2 催化剂可能是一种有前途的 HDO 性能催化剂。