Hydroconversion of fatty acid derivative over supported Ni-Mo catalysts under low hydrogen pressure
Hydroconversion of fatty acid derivative over supported Ni-Mo catalysts under low hydrogen pressure
复制标题
DOI：
10.1016/j.cattod.2017.08.023
复制
发表时间：
2018-04-01
期刊：
影响因子：
5.3
通讯作者：
Al-Khattaf, Sulaiman S.
中科院分区：
文献类型：
--
作者：
Imai, Hiroyuki;Kimura, Toshiyuki;Al-Khattaf, Sulaiman S.
在0.4MPa的低氢压下，以γ-Al_2 O_3为载体，Ni和/或Mo为催化剂，对月桂酸甲酯加氢转化制烃进行了研究。采用Ni/Mo共浸渍法制备的无硫Ni-Mo/γ-Al_2 O_3催化剂的ML转化率（56.6%）明显高于Ni/γ-Al_2 O_3（25.3%）和Mo/γ-Al_2 O_3（1.4%）。Ni-Mo/γ-Al 2 O3催化剂主要通过加氢脱羰/加氢脱羧反应生成正十一烷，同时加速加氢脱氧反应生成正十二烷。Ni-Mo/γ-Al 2 O3中Mo含量较高时，Ni和Mo物种之间的协同效应增强，促进ML的加氢转化和加氢脱氧反应，抑制烃类产物的加氢裂化和CO/CO2的甲烷化。此外，在Ni/Mo原子比为1至3的范围内，Ni-Mo催化剂中出现特定的协同效应，以进一步促进加氢脱氧反应以形成正十二烷。
The hydroconversion of methyl laurate (ML) to hydrocarbons has been carried out over Ni and/or Mo supported on gamma-Al2O3 catalysts under a low hydrogen pressure of 0.4 MPa. The sulfur-free Ni-Mo/gamma-Al2O3 catalyst prepared by co-impregnation of Ni species with Mo species exhibited remarkably higher conversion of ML (56.6%) in comparison with Ni/gamma-Al2O3 (25.3%) and Mo/gamma-Al2O3 (1.4%). Ni-Mo/gamma-Al2O3 predominantly produced n-undecane through the hydrodecarbonylation/hydrodecarboxylation process, while accelerated the hydrodeoxygenation reaction to produce n-dodecane. Synergistic effects between Ni and Mo species were enhanced with a high Mo content in Ni-Mo/gamma-Al2O3 to promote the hydroconversion of ML and the hydrodeoxygenation reaction, and to suppress the hydrocraking of hydrocarbon products as well as the methanation of CO/CO2. Furthermore, specific synergistic effects in the Ni-Mo catalyst emerged in the range of Ni/Mo atomic ratios of 1 similar to 3 to further promote the hydrodeoxygenation reaction for the formation of n-dodecane.