33 results about "Hydrodenitrogenation" patented technology

The preparation method comprises the following steps: S1, uniformly mixing aluminum hydroxide dry glue powder, silica sol and an extrusion aid, then adding deionized water and nitric acid for mixing and kneading, and after caragana microphylla is formed, drying and roasting to obtain an aluminum oxide-silicon oxide composite carrier; s2, putting the carrier into a modification solution, and performing modification treatment in a high-pressure reaction kettle to obtain a modified aluminum oxide-silicon oxide composite carrier; and S3, preparing a precursor containing metals Mo, Co and Re into an impregnation liquid, adding L-asparaginic acid into the impregnation liquid, impregnating the modified alumina-silicon oxide composite carrier in the impregnation liquid, drying, and roasting to obtain the catalyst. The catalyst prepared by the method has high hydrodenitrogenation performance and metal capacity and long service life.

The invention discloses a bio-oil enhanced hydrodenitrogenation method, which comprises the following steps: adding bio-oil, a catalyst, formic acid and deionized water into a reaction kettle, uniformly stirring to obtain a mixed solution, continuously stirring for reaction, and after the reaction is finished, carrying out suction filtration and distillation to obtain reformed bio-oil. The preparation method of the catalyst comprises the following steps: mixing corn straw and ammonium molybdate, adding deionized water after mixing, stirring and dipping, and then carrying out vacuum drying and calcining to obtain the catalyst. In the catalytic reforming process, formic acid is innovatively introduced to serve as a hydrogen source, the gas-liquid interface transmission resistance of a traditional gaseous hydrogen source is eliminated through the homogeneous hydrogen supply characteristic of liquid formic acid, the flammable and explosive risk of high-pressure hydrogen is avoided, the process safety is improved, meanwhile, formic acid is subjected to in-situ decomposition on the surface of the catalyst to generate active hydrogen species, and the catalytic reforming efficiency is improved. And a synergistic catalysis mechanism is formed with a platinum-like active site of the catalyst, so that the kinetic advantage of the hydrodenitrification reaction is enhanced, and an efficient, safe and environment-friendly bio-oil hydrodenitrification process system is constructed.

The invention discloses a residual oil hydrodenitrification catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and active metal components, wherein the active metal components comprise Mo and group VIII metal elements; the Mo comprises + 5 valence Mo; the group VIII metal element exists in the catalyst in the form of metal phosphide. The hydrodenitrification catalyst is high in active metal utilization rate, good in carbon deposition resistance and high in denitrification capacity, and has relatively high denitrification activity and good stability when being used for a residual oil hydrodenitrification reaction.

The invention discloses a residual oil hydrotreating system and a residual oil hydrotreating process control method, and the system comprises a data acquisition device, a data processing device, a control device, and a plurality of reactors connected in series. The reactors comprise a hydrogenation protective agent reactor, a hydrodemetallization agent reactor, a hydrodesulfurization agent reactor and a hydrodenitrogenation carbon residue removal agent reactor; each reactor comprises a plurality of reaction tubes which are connected in parallel; the data acquisition device acquires working condition information; the data processing device comprises a strategy generation unit and an instruction generation unit; the strategy generation unit is used for generating a catalyst grading strategy; the instruction generation unit is used for generating a valve control instruction. On-line adjustment of the grading of the catalyst can be carried out only by controlling the opening and closing number of the inlet and outlet valves of the reaction tube in the reactor; therefore, the economic loss caused by shutdown is reduced.

The application discloses a preparation method of a hydroresid catalyst, and comprises the following contents: (1) preparing a boron-modified alumina carrier A; (2) immersing the boron-modified alumina carrier A into a propylene oxide solution, treating the carrier in a sealed pressure-resistant container at 60-100 DEG C for 1-4 hours, then increasing the temperature to 110-180 DEG C and treating the carrier for 2-6 hours, and then drying the carrier after the treatment to obtain an alumina carrier B; (3) ultrasonic treating the alumina carrier B immersed in a boric acid solution, drying the carrier after the treatment, preparing an alumina carrier C, and then loading a hydrogenation active component to obtain the hydroresid catalyst. The hydroresid catalyst has suitable B acid and L acid, the surface particle morphology is worm, the pore is open, and the catalyst is beneficial to the diffusion of reactant molecules to the inside of the catalyst. The catalyst has high hydrodesulfurization, hydrodenitrogenation and hydroresid activity when being used in a heavy oil and residual oil hydroprocessing process.

This invention discloses an alumina material, a hydrogenation catalyst, and its preparation method. The alumina material of this invention is a mixed phase of γ-Al₂O₃ and AlOOH, wherein the AlOOH morphology is worm-like and grows in situ on the outer surface of the γ-Al₂O₃ support, with worm-like AlOOH crystals covering 85%-100% of the outer surface of the γ-Al₂O₃ support. The preparation method of the alumina material of this invention includes the following steps: The γ-Al₂O₃ support is placed in a propylene oxide solution and subjected to hydrothermal treatment under sealed conditions: first, hydrothermal treatment at 60-100℃ for 1-4 hours, then hydrothermal treatment at 110-180℃, preferably 120-160℃, for 2-6 hours; the treated material is then dried to obtain the alumina material. The alumina material exhibits a worm-like surface particle morphology and a high content of 8-15nm pores. This alumina material as a support has broad application prospects in heterogeneous catalyst reactions, especially in the field of heavy oil hydrogenation. The hydrogenation catalyst prepared using this support has high hydrodenitrification and desulfurization activity.

This invention discloses a hydrodenitrification catalyst for residue oil, its preparation method, and its application. The catalyst includes a support and a second active metal component. The support comprises a first active metal phosphide, a first active metal carbide, and alumina. The molar ratio of the first active metal phosphide to the first active metal carbide, calculated as the first active metal, is 1:0.20–0.40. This hydrodenitrification catalyst exhibits good macromolecular diffusion properties, strong denitrification capacity, strong metal-containing capacity, and good resistance to coking. This hydrodenitrification catalyst is particularly suitable for residue oil hydrodenitrification processes, demonstrating excellent demetallization and denitrification activity as well as good activity stability.

A hydrodesulfurization or hydrodenitrogenation catalyst, the hydrodesulfurization or hydrodenitrogenation catalyst comprising an amount of a composition, the composition comprising: a population of crystalline transition metal dichalcogenide platelets having the empirical formula MC2, wherein M is a transition metal and C is a chalcogenide, each of the platelets comprising a region of 2H phase and / or a region of 3R phase, and each of the platelets being characterized as comprising a single atomic layer to a few atomic layers.

The present invention discloses a method for hydrotreating residual oil. The method adopts a fixed-bed hydrogenation process, including: in the presence of hydrogen, a residual oil raw material is contacted with at least one hydroremoval carbon residue catalyst and at least one hydrodenitrogenation catalyst in sequence for hydrogenation reaction to obtain hydrogenated oil; the hydroremoval carbon residue catalyst is a sulfided catalyst, including a carrier and active metals Mo and Ni, further including Se, characterized by TEM-EDS method, and the Se content distributed in the Ni-Mo-S active phase region accounts for 65%-95% of the total Se content; the hydrodenitrogenation catalyst is a sulfided catalyst, including a carrier and active metals Mo and Ni, further including Ga, characterized by TEM-EDS method, and the Ga content distributed in the Ni-Mo-S active phase region accounts for 60%-95% of the total Ga content. The residual oil hydrotreating method of the present invention has the effect of deep carbon removal and denitrification.

The invention provides a hydrodenitrogenation and carbon residue removal catalyst as well as a preparation method and application thereof, and the preparation method comprises the following steps: preparing unit cell distortion pseudo-boehmite P1; mixing the P1 with pseudo-boehmite P2, and dipping with a boric acid solution to obtain boron modified pseudo-boehmite F1; mixing the P1 and pseudo-boehmite P3, and impregnating the mixture with a phosphorus-containing solution to obtain phosphorus-modified pseudo-boehmite F2; carrying out ball rolling molding on the F1 to obtain an alumina carrier precursor; mixing the alumina carrier precursor with F2, rolling and molding, and then drying and roasting to obtain the alumina carrier; impregnating the alumina carrier with the impregnation liquid to obtain a catalyst intermediate; immersing the catalyst intermediate into a urea solution A for hydrothermal treatment, and washing, drying and roasting the material subjected to hydrothermal treatment to prepare the hydrodenitrogenation and carbon residue removal catalyst, the catalyst prepared by the method has the advantages of large average pore size of the shell layer, high B acid content of the core layer, and appropriate action between the active metal and the carrier in the catalyst, and is suitable for the field of catalyst preparation.

The invention discloses a hydrofining catalyst and a preparation method thereof, the hydrofining catalyst comprises transition metal phosphide and alumina, the transition metal phosphide is WP and Ni2P; the dispersity of the transition metal phosphide is 24%-55%, and the average particle diameter of the transition metal phosphide is 4-9 nm. The preparation method comprises the following steps: (1) adding an Al-containing solution into a gel forming reaction tank, adjusting the pH value to an initial reaction value, and then carrying out a parallel flow gel forming reaction on a W, Ni and Al-containing solution and a sodium phosphate solution to obtain slurry; (2) slurry is divided into slurry A and slurry B, and the slurry B is aged; and (3) mixing the slurry A, the aged slurry B and a phosphate compound, adding a W-containing solution in the aging process, after aging is finished, carrying out solid-liquid separation to obtain a solid-phase material, drying, molding, washing, drying, roasting and reducing to obtain the catalyst. The catalyst provided by the invention has high hydrodesulfurization and hydrodenitrogenation reaction performance, and is suitable for being applied to ultra-deep hydrodesulfurization and denitrogenation reactions of diesel fractions.

The invention discloses a CoW hydrogenation catalyst with low metal content, which comprises a carrier and active metal components loaded on the carrier, and the active metal components comprise a main active metal component W and an auxiliary active metal component Co; the total mass of the hydrogenation catalyst is 100%, the content of the active metal component is 3 wt%-15 wt% in terms of oxide, and the content of the carrier is 85 wt%-96 wt%. Compared with the prior art, the content of CoW in the hydrogenation catalyst is low, the hydrogenation catalyst still has excellent catalytic activity on the basis of low metal content, the hydrodesulfurization rate of the catalyst exceeds 90% and the hydrodenitrification rate exceeds 60% at the temperature of 380 DEG C and when the content of active metal is 4.5 wt%, and the content of sulfur and nitrogen in a reaction product is effectively reduced.

The invention relates to the technical field of hydrogenation catalysts, and discloses a gasoline selective hydrogenation catalyst and a preparation method and application thereof. The preparation method of the gasoline selective hydrogenation catalyst comprises the following steps: (1) loading alkali metal and / or alkaline earth metal onto a carrier to obtain a modified carrier; (2) loading nickel, at least part of molybdenum and a first organic matter onto the modified carrier by adopting an impregnation method, and then carrying out carbonization treatment to obtain a carbonized product; (3) loading cobalt, at least part of molybdenum and a second organic matter onto the carbonized product by adopting an impregnation method, and then carrying out hydrothermal treatment and first post-treatment to obtain a catalyst precursor; and (4) loading a third organic matter on the catalyst precursor by adopting an impregnation method, and then carrying out hydrogenolysis post-treatment. The catalyst prepared by the method has good competition and selection among hydrodenitrogenation, olefin saturation and aromatic hydrocarbon hydrogenation, and the aromatic hydrocarbon selectivity and the stability of the catalyst are improved while deep denitrification is performed.

The present application provides a residue hydrodenitrogenation catalyst, a preparation method and application thereof. The catalyst comprises a carrier and an active metal component, the carrier comprises modified Y molecular sieve and alumina, the modified Y molecular sieve is small crystal grain mesoporous modified Y molecular sieve, and the properties are as follows: the crystal grain size is 500 nm or less, the molar ratio of silicon oxide to alumina is 8-55, the specific surface area is 640-800 m 2 / g, the cell parameter is 2.433-2.460 nm, and the average pore size is 10-30 nm. The catalyst is used in a residue hydrodenitrogenation process, and can improve the denitrogenation activity and stability.

This invention discloses a method for preparing a catalyst for hydrodenitrification and decarbonization of heavy oil, comprising the following steps: (1) mixing boehmite powder, boron-containing micron-sized spherical activated carbon, and water into a slurry, then separating the solid and liquid phases, drying the solid phase material, then kneading, molding, drying, and calcining under an inert atmosphere to obtain an alumina support precursor, and then loading boron to obtain a boron-modified alumina support precursor; (2) adding the boron-modified alumina support precursor and propylene oxide aqueous solution into a closed high-pressure reactor, reacting at 60-100℃ for 1-4 hours, then raising the temperature to 110-180℃ for 2-6 hours, drying, and calcining to obtain an alumina support, and then loading hydrogenation active components to obtain the catalyst product. The catalyst prepared by this method has a worm-like particle morphology on its surface, and the pores formed by the accumulation of worm-like particles are open. The catalyst also has suitable Brønsted acid and Lewis acid content. This catalyst is suitable for hydrodenitrification and decarbonization reactions of inferior heavy oil.

The invention discloses a grading method and application of a hydrotreating catalyst. The method comprises the following steps: arranging N hydrotreating catalysts along a material flow direction; the activity of the downstream hydrotreating catalyst is greater than that of the upstream hydrotreating catalyst adjacent to the downstream hydrotreating catalyst; the active metal of each hydrotreating catalyst comprises group VIB metal and group VIII metal; the weight ratio of the group VIB metal to the group VIII metal in the downstream hydrotreating catalyst is greater than the weight ratio of the group VIB metal to the group VIII metal in the adjacent upstream hydrotreating catalyst, and the active metal is calculated by oxide; in each hydrotreating catalyst, the weight ratio of the VIB group metal to the VIII group metal is 2-12 in terms of oxide. The grading method can improve the catalytic performance of a distillate oil hydrogenation reaction system. Especially, the hydrodenitrogenation performance is improved.

The application provides a hydrodesulfurization and denitrification catalyst and a preparation method and application thereof, and the preparation method comprises the following steps: uniformly mixing manganese salt and zirconium salt, dissolving the mixture, and adding a phosphoric acid solution to obtain a heteroatom precursor solution; uniformly mixing and stirring gamma-alumina and the heteroatom precursor solution, drying the mixture, and obtaining a heteroatom modified gamma-alumina precursor; uniformly dissolving and mixing citric acid and nitric acid to obtain an acid solution; uniformly mixing the heteroatom modified gamma-alumina precursor and sesbania powder, adding the acid solution, rolling, extruding into a strip, drying, and calcining to obtain a hydrodesulfurization and denitrification catalyst carrier; configuring tungsten salt and nickel salt into an impregnation solution, impregnating the hydrodesulfurization and denitrification catalyst carrier in a saturated impregnation mode, drying, and calcining to obtain the hydrodesulfurization and denitrification catalyst. The hydrodesulfurization and denitrification catalyst prepared by the method has high desulfurization and denitrification activity for poor-quality wax oil, and the yield of paraffin is also improved.

The invention discloses a heavy distillate oil hydrogenation catalyst preparation method, which comprises: (1) adding an aluminum source into a gel forming reaction tank, adjusting the pH value to 4.5-6.0 by using a first phosphorus source, alternately carrying out a parallel flow gel forming reaction on an aluminum tungsten solution, the first phosphorus source and ammonia water, adding one part of a rare earth salt solution and one part of a nickel salt solution at the beginning of each alternation, a gel forming material is obtained; (2) dividing the gelling material into a first gelling material and a second gelling material, and aging the second gelling material to obtain an aged second gelling material; and (3) mixing the first gelling material, the aged second gelling material and a second phosphorus source, aging, adding a tungsten source in the aging process, after the aging is finished, carrying out solid-liquid separation to obtain a solid-phase material, drying, molding, washing, drying, roasting and reducing to obtain the catalyst. The catalyst provided by the invention has high hydrodesulfurization and hydrodenitrogenation reaction performance, and is suitable for being applied to hydrodesulfurization and hydrodenitrogenation reactions of heavy distillate oil.

The invention provides a preparation method and application of a hydrodenitrification catalyst, and the preparation method comprises the following steps: step 1, mixing an active component precursor, a dispersant and thiosulfate to prepare an impregnation liquid; and 2, mixing a carrier with the impregnation liquid, carrying out pressurization treatment, drying, and roasting to obtain the hydrodenitrification catalyst. The dispersion degree of metal active components of the catalyst is promoted by adding the dispersing agent, the sulfuration degree of the catalyst can be improved by adding the thiosulfate, sulfur vacancies of the catalyst are increased, then active sites for adsorbing reactant macromolecules are increased, and the hydrodenitrogenation performance of the catalyst is improved.

The present disclosure relates generally to processes for handling renewable hydrocarbon feeds and conventional hydrocarbon feeds. One aspect of the disclosure provides a process for co-processing a renewable feed and a petroleum feed, the process comprising: hydrotreating the petroleum feed in a first reaction one, wherein the hydrotreating of the petroleum feed comprises one or more of hydrodesulfurization, hydrodenitrogenation, hydrodemetallization, isomerization, hydrogenation of olefins, and hydrocracking, to form a first reaction zone effluent; conducting the first reaction zone effluent to a second reaction zone; and in the second reaction zone hydrotreating a combination of the first reaction zone effluent and the renewable feed, wherein the hydrotreating of the combination comprises one or more of hydrodeoxygenation, decarboxylation, decarbonylation, isomerization and hydrogenation of olefins of the renewable feed, to form a second reaction zone effluent.

The invention provides a hydrodenitrogenation and carbon residue removal catalyst with wormlike pores on the outer surface and a preparation method thereof. The method is suitable for the technical field of catalyst preparation. The preparation method comprises the following steps: mixing boron modified unit cell distorted pseudo-boehmite, phosphorus modified pseudo-boehmite and sesbania powder, adding a peptizing agent, kneading and forming, and performing fourth drying and third roasting to obtain a modified alumina carrier; impregnating the modified alumina carrier with a solution A containing an active metal component, and carrying out fifth drying and fourth roasting to prepare a catalyst intermediate; and adding a second urea solution, carrying out third hydrothermal treatment, filtering, washing, carrying out sixth drying, and carrying out fifth roasting to obtain the hydrodenitrogenation and carbon residue removal catalyst with wormlike pore channels on the outer surface. The catalyst has the beneficial effects that the outer surface is wormlike pore channels, the content of mesopores and macropores is relatively high, the content of Bronsted acid and Lewis acid on the surface of the catalyst is rich, the Bronsted acid and the Lewis acid are highly matched with the pore channel structure, and the defect content of the catalyst is rich.

To provide bulk catalysts comprising oxides of nickel, molybdenum, tungsten and titanium, and methods for synthesizing bulk catalysts.SOLUTION: The catalysts are useful for hydroprocessing, particularly hydrodesulfurization and hydrodenitrogenation, of hydrocarbon feedstocks. The bulk catalyst precursor is not calcined and comprises hydroxides.SELECTED DRAWING: Figure 1

The invention relates to the technical field of oil refining catalysts, and discloses an oil refining catalyst and a preparation method thereof. According to the catalyst, aluminum oxide is used as a main carrier, and a hierarchical porous structure with micropores, mesopores and macropores is obtained through reasonable forming and heat treatment processes, so that the pore size distribution is more balanced. The carrier has relatively high specific surface area and total pore volume, and also shows good hydrothermal stability. It is found through characterization that the surface of the carrier contains a proper amount of nitrogen element, the nitrogen element exists in a stable chemical state, and favorable conditions are provided for uniform dispersion of active metal components. When the catalyst is applied to hydrodesulfurization and hydrodenitrification reactions, the diffusion efficiency of reactants and the utilization rate of metal active sites can be remarkably improved, and the catalyst shows relatively high removal rate and long-term stability.

The invention provides a method and a device for predicting the nitrogen content of refined wax oil. The method comprises the following steps: obtaining raw material wax oil nitrogen content, raw material wax oil sulfur content, raw material distillation range and operation parameters involved in a refined wax oil generation process; inputting the raw material wax oil nitrogen content, the raw material wax oil sulfur content, the raw material distillation range and the operation parameters into a pre-established hydrodenitrification kinetic model to obtain the removed nitrogen content; and subtracting the removed nitrogen content from the nitrogen content of the raw material wax oil to obtain the nitrogen content of the refined wax oil. Wherein the hydrodenitrification kinetic model is constructed through the following operations: obtaining an influence expression of the sulfur content of a raw material on a denitrification reaction; obtaining an influence expression of a raw material distillation range on a nitride removal reaction; and obtaining a nitride removal expression according to the influence expression of the sulfur content of the raw material on the denitrification reaction and the influence expression of the distillation range of the raw material on the nitride removal reaction. The problem that a traditional method is insufficient in adaptability to raw materials is solved.

This invention provides a method for hydrotreating inferior oil. The method employs a fixed-bed hydrotreating process. In the presence of hydrogen, the inferior oil is sequentially contacted with at least one hydrodesulfurization catalyst and at least one hydrodenitrification catalyst to undergo a hydrotreating reaction, yielding hydrotreated oil. The hydrodesulfurization catalyst comprises a support and an active component, preferably including an additive. The support comprises a silicon-modified nickel-aluminum alloy, and the active component is an organomolybdenum, preferably alkyl dithiophosphate molybdenum and / or alkyl dithiocarbamate molybdenum, with an additive being organozinc. The hydrodenitrification catalyst also comprises a support and an active component. The support comprises a silicon-modified nickel-aluminum alloy, and the active component includes an organomolybdenum, preferably alkyl dithiophosphate molybdenum and / or alkyl dithiocarbamate molybdenum. Preferably, the hydrodenitrification catalyst includes an additive organogallium. This hydrotreating method exhibits strong desulfurization and denitrification effects for inferior secondary processed oils.

In accordance with one or more embodiments of the present disclosure, a process for treating a diesel feedstock to convert diesel to component-paraffins includes hydrodesulfurizing and hydrodenitrogenizing the diesel feedstock to reduce a sulfur content of the diesel feedstock and a nitrogen content of the diesel feedstock; hydrocracking the hydrodesulfurized and hydrodenitrogenized diesel feedstock over a metal-containing diesel hydrocracking catalyst comprising at least one zeolite to produce a hydrocrackate fraction; separating the hydrocrackate fraction into a first stream enriched in n-paraffins and a second stream enriched in iso-paraffins and naphthenes; and reverse isomerizing at least a portion of the second stream over an isomerization catalyst to convert at least a portion of the iso-paraffins to n-paraffins, producing a reverse isomerate fraction.

The application discloses a kind of hydrodenitrogenation catalyst and its preparation method and application.The catalyst includes carrier and active component, the active component includes Mo and Zn and / or Cu, the content of Mo is 6%-16% based on the total weight of catalyst, the content of Zn and / or Cu is 0.5%-4.5%, the mass ratio of Mo and S is above 1.5.The hydrodenitrogenation catalyst of the application not only has good hydrodenitrogenation activity when processing low-sulfur heavy residual oil feedstock, but also has good activity stability, and is particularly suitable for processing ebullated bed hydrogenation tail oil.

The application provides a hydrodenitrogenation catalyst and a preparation method thereof. The hydrodenitrogenation catalyst comprises a carrier and an active component, the carrier comprises a modified nickel-aluminum alloy, and the active component comprises organic molybdenum, preferably molybdenum alkyl dithiophosphate and / or molybdenum alkyl dithiocarbamate; preferably, the hydrodenitrogenation catalyst comprises an auxiliary organic gallium. The hydrodenitrogenation catalyst has strong hydro-saturation capacity and hydrodenitrogenation capacity for poor raw materials with high nitrogen content and high aromatic content.

The invention discloses a hydrodenitrification catalyst as well as a preparation method and application thereof. The catalyst comprises a carrier and a hydrogenation active metal component, and the carrier is loaded with an organic nitrogen-containing compound; the organic nitrogen-containing compound is selected from at least one of carbazole nitrogen-containing compounds and acridine nitrogen-containing compounds containing substituent groups and / or functional groups. The preparation method of the hydrodenitrification catalyst comprises the following steps: impregnating a carrier with a solution containing an organic nitrogen-containing compound, and drying to obtain a catalyst intermediate; and impregnating the catalyst intermediate with an impregnation liquid containing hydrogenation active metal, and drying to obtain the catalyst. The catalyst provided by the invention is used in a heavy distillate oil hydrodenitrogenation process, and can obviously improve the deep hydrodenitrogenation activity and stability.

The invention relates to the technical field of coal tar hydrogenation, and particularly discloses a deep denitrification method for preparing light fuel oil by coal tar hydrogenation. The method comprises the following steps: carrying out filtration, dehydration, demetallization and deasphaltene pretreatment on coal tar, and carrying out a first-stage hydrogenation reaction in the presence of a conventional catalyst; feeding the mixture into a second hydrogenation reactor filled with an N-P co-doped ordered mesoporous carbon loaded Zr < 3 + > doped Ni2P catalyst, and carrying out hydrocracking and oxygen introduction assisted in-situ regeneration; and finally, carrying out deep adsorption through a nitric acid modified ZSM-5 and aluminum oxide composite adsorbent to obtain the light fuel oil. According to the invention, a multi-stage synergistic process of step-by-step impregnation and in-situ regeneration of the catalyst and B-Si dual auxiliaries and deep denitrification of the composite adsorbent is adopted, so that the hydrodenitrification activity and the catalyst stability are enhanced, the total nitrogen content of the product is effectively reduced, and the yield of light fractions of gasoline and diesel oil is improved. The method is high in denitrification depth, long in catalyst service life, capable of achieving efficient resource utilization of coal tar and suitable for industrial production.