Mo-Ni-NH3/r-Al2O3分散性催化剂的表征及应用

摘要/Abstract

摘要： 采用过饱和浸渍法制备4种大孔Mo-Ni-NH₃/r-Al₂O₃催化剂，考察了助溶剂种类和用量对活性金属分散性的影响，利用X射线衍射、透射电镜、N₂吸附-脱附、H₂-程序升温还原、X射线光电子能谱等表征制备催化剂的结构和物种分布，并通过劣质催化裂化柴油加氢精制评价催化剂的活性。结果表明：采用助溶剂三乙醇胺制备的催化剂A40中活性相分散性最好，预硫化后催化剂表面存在大量高分散的MoS₂片层晶格条；A40催化剂具有更低还原温度和更高硫化度，高活性金属物种Mo4+占比高达86.46%，高活性NiMoS物种占比为56.3%；在制备的4种催化剂中，A40催化剂的加氢脱硫、加氢脱氮和芳烃饱和活性均最高，对催化裂化柴油的脱硫率、脱氮率和芳烃饱和率分别为95.99%，97.48%，65.82%，说明A40催化剂是一种性能良好的加氢催化剂。

关键词: 氧化铝, 催化剂, 助溶剂, Mo-Ni-NH₃, 加氢

Abstract: Four kinds of macroporous Mo-Ni-NH₃/r-Al₂O₃ catalysts with large pore size were prepared by supersaturation impregnation method. The structure and species distribution of the catalysts were characterized by XRD, TEM, N₂ adsorption-desorption, H₂-TPR and XPS, and the activity of the catalysts was evaluated by hydrofining of inferior FCC diesel. The results showed that the active phase dispersion of A40 catalyst prepared by co-solvent TEA was the best. There are a lot of highly dispersed MoS₂ lamella lattices on the surface of the catalyst after pre-sulfiding, A40 catalyst has lower reduction temperature and higher sulfurization degree, and the proportion of Mo4+ and NiMoS was 86.46% and 56.3%, respectively. Among the four catalysts, the A40 catalyst had the highest activity of HDS, HDN, and HDAr, and the average conversion rats of HDS, HDN, and HDAr were 95.99%, 97.48% and 65.82%, respectively, indicating that the A40 catalyst was a good hydrogenation catalyst.

Key words: alumina, catalyst, co-solvent, Mo-Ni-NH₃, hydrotreating

丁巍李宇王宏浩牛俊戴咏川张译文. Mo-Ni-NH₃/r-Al₂O₃分散性催化剂的表征及应用[J]. 石油炼制与化工, 2022, 53(6): 61-67.

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Mo-Ni-NH₃/r-Al₂O₃分散性催化剂的表征及应用

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