多级孔分子筛对4,6-二甲基二苯并噻吩加氢脱硫反应性能的影响

以多级孔Y分子筛为酸性组分，采用孔饱和浸渍法制备了含分子筛的CoMoP/Al2O3加氢催化剂，通过X射线衍射、N2吸附-脱附、高分辨透射电镜、吡啶吸附红外光谱等表征手段对分子筛样品进行物化性质分析，并以4,6-二甲基二苯并噻吩为模型化合物，在固定床高压微反装置上考察多级孔分子筛的加入对4,6-二甲基二苯并噻吩加氢脱硫反应活性的影响。结果表明，多级孔Y分子筛较高的外表面积和介孔体积有利于提高分子筛B酸中心的可接近性。与参比剂CoMoP/Al2O3-Y相比，B酸酸量较高的多级孔Y分子筛催化剂的酸催化反应活性明显增强，总加氢脱硫反应活性提高。随着分子筛强B酸酸量的增加，含Y分子筛催化剂的甲基转移反应活性明显提高。

HYDRODESULFURIZATION PERFORMANCE OF 4, 6-DIMETHYLDIBENZOTHIOPHENE OVER CATALYSTS CONTAINING HIERARCHICAL ZEOLITES

CoMoP catalysts containing zeolites were prepared by saturated impregnation using hierarchical Y zeolites as acidic components. The zeolite samples were characterized by X-ray diffraction (XRD), N2 adsorption-desorption, high-resolution transmission electron microscopy (HRTEM) and pyridine-FTIR techniques. The HDS performance of CoMoP catalysts containing hierarchical Y zeolites was evaluated in a high pressure micro-reactor using 4, 6-dimethyldibenzothiophene as a model compound. The results showed that the high external surface area and mesoporous volume of hierarchical Y zeolites contributed to higher accessibility of Br?nsted acid sites. Compared with the reference CoMoP/Al2O3-Y catalyst, the catalysts containing hierarchical Y zeolites with high Bronsted acidity exhibited acid-catalyzed reaction activity and higher total HDS activity. The transalkylation activity was increased with the strong Br?nsted acidity of zeolite.