制备条件对Ni-Mo-W非负载型催化剂微观结构及HDS性能的影响

Effects of preparation conditions on microstructure and HDS performance of Ni-Mo-W unsupported catalyst

非负载型催化剂逐渐成为石油馏分加氢精制催化剂的研究热点,而微观结构是影响其HDS加氢脱硫活性的关键。以共沉淀法制备Ni-Mo-W非负载型催化剂,并结合XRD、BET、H2-TPR、HRTEM等手段对其进行表征,深入分析了金属摩尔比和反应温度对催化剂微观结构和HDS活性的影响。结果表明,在n(Ni)∶n(Mo)∶n(W)=2∶1∶1和90℃的条件下,催化剂物相组成良好,易于硫化还原,孔隙结构发达,具有更优的活性相形貌和更多的强酸酸性中心。

Unsupported catalysts have become the research focus of catalysts for hydrogenation refining of petroleum fractions in recent years. However,the microstructure of unsupported catalyst is the key to influence its HDS activity.Unsupported Ni-Mo-W catalyst is prepared through co-precipitation method and is characterized by means of XRD,BET,H2-TPR,NH3-TPD and HRTEM. The effects of the molar ratio among metals and reaction temperature on catalyst＇s micro-structure and HDS activity are analyzed deeply.The results shows that under the conditions of n（Ni） ∶ n（Mo） ∶ n（W） = 2 ∶1 ∶1 and 90℃,the prepared catalyst has a good phase composition,a developed pore structure,better active phase morphology and more strong-acid acidic sites,and is easy to vulcanization and reduction.