分子筛对CoMoP/Al_2O_3催化剂加氢脱硫反应性能的影响

以USY分子筛为酸性组分,制备了含分子筛的CoMoP/Al_2O_3加氢催化剂,通过N_2吸附-脱附、吡啶吸附红外光谱、X射线光电子能谱和高分辨透射电镜等手段对分子筛及催化剂样品的物化性质进行表征,并采用固定床高压微反装置考察了4,6-二甲基二苯并噻吩的加氢脱硫反应。结果表明,与CoMoP/Al_2O_3催化剂相比,USY分子筛的加入显著提高了4,6-二甲基二苯并噻吩的转化率和脱硫率,同时改变了加氢脱硫反应的产物分布。在CoMoP/Al_2O_3-Y催化剂上,烷基转移和裂化等酸催化反应活性显著提高,直接脱硫路径的活性相当,加氢路径的活性降低。

EFFECT OF ZEOLITE ON HYDRODESULFURIZATION PERFORMANCE OF CoMoP/Al2O3 CATALYST

CoMoP/Al2O3-Y catalysts with USY zeolite as an acidic component were prepared. The samples were characterized by N2 adsorption-desorption, pyridine-FTIR, X-ray photoelectron spectra (XPS) and high-resolution transmission electron microscopy (HRTEM) techniques. The hydrodesulfurization performance of 4, 6-dimethyldibenzothiophene was evaluated over CoMoP/Al2O3-Y catalyst in a high pressure fixed-bed reactor. The results showed that compared with CoMoP/Al2O3, the introduction of USY zeolite significantly improves the conversion and S-removal rate, and changes the HDS product distribution. The transalkylation and cracking activities of CoMoP/Al2O3-Y catalyst increase substantially, the direct desulfurization activity is comparable in activity, however, the activity of hydrogenation route decreases over CoMoP/Al2O3-Y catalyst.