Study On The Hydrodenitrogenation Mechanism Of Pyridine And Pyrrole

Catalytic hydrogenation is an important way to denitrify oil,and the development of high performance hydrodenitrogenation catalyst needs to study the reaction mechanism of hydrodenitrogenation,and the mechanism of hydrodenitrogenation is controversial.In this paper,we designed and prepared the supported MoS₂ and non-supported Ni-Mo-S model catalysts and comparative catalysts.Study the mechanism and reaction kinetics of pyrolysis and pyrolysis of pyrrole and pyridine,and deepen understanding of the active phase nanoparticle structure and surface acidity,which can affect the removal of nitrides,and provide guidance for the design of high performance hydrodenitrogenation catalysts.In this paper,the following works are carried out in the following aspects:Preparation of supported MoS₂ catalyst with ATTM as catalyst and non-supported Ni-Mo-S model catalyst to analyze the activity and selectivity of the catalyst.The hydrogenation of Ni on supported MoS₂ catalyst The effects of sulfide on HDN reaction were investigated in order to propose the reaction mechanism in the presence of sulfide.The correlation between the acidity of the catalyst and the hydrodenitrogenation was investigated.The results show that the hydrogenation of heterocycles is a key step in controlling the rate of pyrrole hydrodenitrogenation.The cleavage rate of CN bond is a key step in controlling the rate of pyridine hydrodenitrogenation reaction.The proportion of n-butane in pyrrole product is the largest,The proportion of pentane and piperidine is the largest.The introduction of Ni plays the role of dispersant,Ni is dispersed in the corner of MoS2,forming Ni-Mo-S active phase.Ni plays a catalytic role in the hydrogenation of pyrrole and pyridine in the hydrodenitrogenation reaction,which facilitates the progress of the?-elimination reaction.Sulfide has a catalytic effect on HDN reactions due to the nucleophilic substitution of nitrides.Preparation of non-supported catalyst,due to the reduction of acid sites,hydrodenitrogenation effect is not ideal,surface acidity plays a key role in hydrodesulfurization.