Priecel Peter, Kubička David, Vázquez-Zavala Armando, Antonio de Los Reyes José, Pouzar Miroslav, Čapek Libor
Department of Physical Chemistry, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czechia.
Unipetrol Centre for Research and Education, Litvínov, Czechia.
Front Chem. 2020 Apr 7;8:216. doi: 10.3389/fchem.2020.00216. eCollection 2020.
This investigation deals with NiMo-alumina hydrotreating catalysts effective in the deoxygenation of rapeseed oil. The main goal was to compare catalyst structure and their deoxygenation performance and to link these parameters to reveal important structural information regarding the catalyst's intended use. Catalysts were prepared from different precursors (nickel acetate tetrahydrate/molybdenyl acetylacetonate in ethanol and water vs. nickel nitrate hexahydrate/ammonium heptamolybdate tetrahydrate in water), which resulted in their contrasting structural arrangement. These changes were characterized by elemental composition determination, UV-Vis diffuse reflectance spectroscopy, temperature programmed reduction by hydrogen, nitrogen physisorption at 77 K, scanning and transmission electron microscopies, and deoxygenation of rapeseed oil. The critical aspect of high oxygen elimination was a homogeneous dispersion of NiO and MoO phases on the support. It subsequently led to the effective transformation of the oxide form of a catalyst to its active sulfide form well-dispersed on the support. On the other hand, the formation of bulk MoO resulted in the separate bulk phase and lower extent of sulfidation.
本研究涉及对菜籽油脱氧有效的镍钼 - 氧化铝加氢处理催化剂。主要目标是比较催化剂结构及其脱氧性能，并关联这些参数以揭示有关催化剂预期用途的重要结构信息。催化剂由不同前驱体制备（乙醇和水中的四水合醋酸镍/乙酰丙酮钼酰与水中的六水合硝酸镍/四水合七钼酸铵），这导致了它们结构排列的差异。通过元素组成测定、紫外可见漫反射光谱、氢气程序升温还原、77K 下的氮气物理吸附、扫描和透射电子显微镜以及菜籽油脱氧对这些变化进行了表征。高氧消除的关键方面是 NiO 和 MoO 相在载体上的均匀分散。这随后导致催化剂的氧化物形式有效地转化为其活性硫化物形式，并很好地分散在载体上。另一方面，块状 MoO 的形成导致了单独的块状相和较低的硫化程度。
