Mechanism and Catalyst Design Progress of Ultra-Deep Hydrodesulfurization of Diesel Oil
The reaction mechanism of diesel hydrodesulfurization,the traditional supported catalysts and unsupported catalysts as the possible future development direction were reviewed,providing guidance for the development of ultra-low sulfur diesel production technology.In terms of mechanism,spatially hindered sulfides can affect the direct desulfurization and hydrogenation pathways of hydrodesulfurization to different extents.For traditional supported catalysts,the synergistic effect between metals,the typeⅡ Ni-Mo-S active phase,the large pore diameter and high specific surface area support,the high content of medium and weak acids on the support surface,and a certain amount of Bronsted acid are beneficial to the improvement of catalyst activity.For unsupported catalysts,the pore structure of the catalyst can be enriched by two methods:non-template method and template method,which can improve the metal utilization rate and then improve the catalyst activity,and produce ultra-low sulfur diesel that meets the market demand.In summary,developing new catalysts is the current research hotspot in the field of ultra-deep hydrodesulfurization of diesel,and further research is still needed.
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