不同硅铝比ZSM-5-KIT-1载体加氢脱硫催化剂的制备及性能研究

摘要

采用一步晶化双模板法制备了不同硅铝比的 ZSM-5-KIT-1介微孔复合分子筛，并以其为载体搭载20%MoOx7%CoOx通过超载浸渍法制备加氢脱硫催化剂；利用 X-射线衍射(XRD)、N2吸附-脱附分析、NH3化学吸附(NH3-TPD)分析等表征手段分析其结构和酸性；以CS2的环己烷溶液为硫化液、二苯并噻吩的十氢萘溶液为原料液，在小型固定床反应器中评价该催化剂的加氢脱硫反应活性。结果表明，该加氢脱硫催化剂具有良好的结构稳定性、大的比表面积和孔径、适宜的酸量和酸中心；当硅铝比为30或40时，催化剂的加氢脱硫反应活性远高于其它样品，表明硅铝比是影响催化剂加氢脱硫反应活性的重要因素。%Micro-mesoporous ZSM-5-KIT-1 molecular sieves with different Si/Al ratios were prepared by one-step crystallization with two templates.They were used as supporters for preparation of 20%MoOx7%CoOx-supported hydrodesulfurization catalysts by an over-loading impregnation method.The catalysts were charac-terized by X-ray diffraction(XRD),nitrogen adsorption-desorption,and NH3 chemisorption(NH3-TPD).The hydrodesulfurization reaction activity of catalysts was evaluated in a small-scale fix-bed reactor by using cyclo-hexane solution with CS2 as a sulfide oil and decalin with dibenzothiophene as a raw material.Results showed that the catalysts had good structural stability,large specific surface area and aperture,and suitable acidic a-mounts and sites.When Si/Al ratio was 30 or 40,the hydrodesulfurization reaction activity of catalysts were higher than others,which confirmed that Si/Al ratio was an important factor affecting hydrodesulfurization reaction activity.