Effect Of Quinoline On Hydrodesulfurization Poisoning Performance Of Dibenzothiophene,4,6-Dimethyldibenzothio-Phene And Diesel

Hydrodesulfurization?HDS?technology has caused widespread concern in the industry because it can simultaneously meet the demand of automotive diesel growing and the increasingly stringent environmental regulations.However,the complex organic nitrogen-containing in the oil poisons the active sites of the catalyst and reduces the reactivity of the catalyst.Therefore,the study of the poisoning behavior of quinoline on diesel and its sulfur-containing components is particularly critical for the development of highly active industrial catalysts.In this paper,the industrial NiMo/?-Al₂O₃ catalyst system was employed to systematically investigate the poisoning of quinoline in the model compound system and the real FCC diesel system.The effect of quinoline on the hydrodesulfurization reaction was analyzed from the kinetic point of view.The experimental parameters obtained by compound reaction simulations predicted the poisoning effect of quinoline on complex real oil hydrodesulfurization.Using the Langmuir-Hinshelwood?L-H?equation,the hydrodesulfurization reaction rate equation for dibenzothiophene?DBT?and4,6-dimethyldibenzothiophene?4,6-DMDBT?with quinoline addition can be obtained.Using the inhibition adsorption constant and fitting index of nitrogen-containing in the hydrodesulfurization reaction rate equation of DBT,the conversion rate of DBT in real FCC diesel is guided,and the calculated values are in good agreement with the experimental data.In addition,the effect of nitrogen-containing on the pathway of DBT and4,6-DMDBT hydrodesulfurization reaction were analyzed from the perspective of pathway selectivity and pathway yield.For the HDS reaction of DBT,the higher the content of nitrogen-containing in the reaction system is,the lower the initial DDS pathway selectivity is,and the initial selectivity of the HYD pathway is opposite.The presence of nitrogen-containing can weakly promote the DDS pathway yield of DBT and significantly inhibit the HYD pathway yield.For the HDS reaction of4,6-DMDBT,the addition of nitrogen-containing can suppress the selectivity of the DDS pathway,while the HYD pathway selectivity increases.The higher the nitrogen content is,the more pronounced this effect is.