The hydrodesulphurization of a model component and equimolar ternary mixture of thiophene, 2-ethylthiophene and benzothiophene over sulphided CoMo/γ-Al₂O₃ and CoMo/γ-Al₂O₃-Nb₂O₅ catalysts were investigated in a fixed bed flow reactor. The catalysts were prepared by incipient wetness impregnation method and characterized by textural characteristics, total acidity and chemical species present on the catalysts surface. The characterization results showed that both CoMo/γ-Al₂O₃-Nb₂O₅ and sulphided CoMo/γ-Al₂O₃ catalysts exhibit a mesoporous structure with cylindrical pores open at both ends, evidenced by the IV type adsorption–desorption isotherm with a H1 hysteresis loop and have an average pore diameter between 3 and 4 nm. The chemical species present on the catalysts surface evaluated by XPS indicated that Co²⁺ and Mo⁴⁺ species are present in the sulfide form on both catalysts surfaces. In addition, there are also found oxidic species arising from incomplete reduction and sulphidation. The presence of niobium oxide in the catalytic support had a positive effect in leading to higher specific surface area (170 m²/g) and total acidity (0.421 meq/g) compared with CoMo/γ-Al₂O₃ catalyst (140 m²/g and 0.283 meq/g) respectively. The evaluation results from the hydrodesulfurization showed that CoMo/γ-Al₂O₃-Nb₂O₅ catalyst had a higher activity in hydrodesulphurization process of thiophene, 2-ethylthiophene and benzothiophene. The CoMo/γ-Al₂O₃-Nb₂O₅ catalyst eliminated sulfur from the single component feed (corresponding to 2380 ppm S) and reduced below 10 ppm, for the feed consisting in the equimolar ternary mixture of thiophene, 2-ethylthiophene and benzothiophene (2380 ppm S). The reactivity of thiophen compounds was reduced due to competitive adsorption. It was observed that benzothiophene inhibits the transformation of thiophene and 2-ethylthiophene. A mutual inhibition effect between sulfur compounds was also observed when thiophene, 2-ethylthiophene and benzothiophene were combined and tested over the CoMo/γ-Al₂O₃ catalyst. The inhibition effect had a lower intensity by introducing Nb₂O₅ in the catalyst support.

在固定床流中研究了模型组分和噻吩、2-乙基噻吩和苯并噻吩的等摩尔三元混合物在硫化 CoMo/γ-Al ₂ O ₃和 CoMo/γ-Al ₂ O ₃ -Nb ₂ O ₅催化剂上的加氢脱硫反应堆。催化剂是通过初湿浸渍法制备的，并通过催化剂表面存在的结构特征、总酸度和化学物质进行表征。表征结果表明，CoMo/γ-Al ₂ O ₃ -Nb ₂ O ₅和硫化 CoMo/γ-Al ₂ O ₃催化剂表现出两端开放的圆柱形孔的中孔结构，由具有 H1 滞后回线的 IV 型吸附-解吸等温线证明，平均孔径在 3 到 4 nm 之间。通过 XPS 评估的催化剂表面上存在的化学物质表明 Co ²⁺和 Mo ⁴⁺物质以硫化物形式存在于两个催化剂表面上。此外，还发现了因不完全还原和硫化而产生的氧化物质。氧化铌中的催化剂载体的存在有在导致更高的比表面积的积极作用（170米² / g）和总酸度（0.421毫当量/克）用的CoMo /γ-Al系相比₂ ö ₃催化剂（140米²/g 和 0.283 meq/g)。加氢脱硫评价结果表明，CoMo/γ-Al ₂ O ₃ -Nb ₂ O ₅催化剂在噻吩、2-乙基噻吩和苯并噻吩的加氢脱硫过程中具有较高的活性。CoMo/γ-Al ₂ O ₃ -Nb ₂ O ₅对于由噻吩、2-乙基噻吩和苯并噻吩的等摩尔三元混合物（2380 ppm S）组成的进料，催化剂从单组分进料中去除硫（对应于 2380 ppm S）并减少到 10 ppm 以下。由于竞争吸附，噻吩化合物的反应性降低。观察到苯并噻吩抑制噻吩和2-乙基噻吩的转化。当噻吩、2-乙基噻吩和苯并噻吩组合并在CoMo/γ-Al ₂ O ₃催化剂上进行测试时，还观察到硫化合物之间的相互抑制作用。通过在催化剂载体中引入 Nb ₂ O ₅抑制效果具有较低的强度。