CN102909055B - Preparation method for metal phosphide type hydrocracking catalyst - Google Patents
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Abstract
The invention describes a preparation method of a metal phosphide type hydrocracking catalyst. The method comprises the following steps of (1) preparing a catalyst carrier containing a molecular sieve and an inorganic refractory oxide; (2) preparing a dipping solution containing a VIB group metallic compound, a VIII group metallic compound and an inorganic phosphorus-containing compound; (3) dipping the catalyst carrier obtained for the step (1) with the dipping solution prepared by the step (2), and then drying the dipped material; and (4) performing hydrogen activation on the material obtained from the step (4), obtaining the hydrocracking catalyst used for hydrocracking reactions after the activation. The hydrocracking catalyst prepared by the method has outstanding usage performance, and is particularly suitable for a hydrocracking process of increasing middle distillates.
Description
Technical field
The present invention relates to a kind of preparation method of hydrocracking catalyst, this catalyst has excellent hydrocracking performance, and active high, middle distillates oil selectivity is high.
Background technology
Hydrocracking catalyst is a kind of bifunctional catalyst, there is Hydrogenation and cracking performance, non-noble metal hydrocracking catalyst generally selects VI B and VIII race's metal to make hydrogenation component, and cracking performance provides primarily of acidic components, and acidic components can select crystal formation zeolite and/or amorphous aluminum silicide etc.Simple amorphous aluminum silicide, although selective higher, active low, operational flexibility is restricted, in most of hydrocracking catalyst all with crystal formation zeolite for acidic components, or crystal formation zeolite and amorphous aluminum silicide are acidic components jointly.
The middle oil type hydrocracking catalyst major part that commercial plant uses at present is the catalyst containing zeolite, and the zeolite component adopted mainly y-type zeolite, β zeolite and two kinds of zeolites are used in combination, and catalyst all will carry out presulfurization before reactions, metal component is made to be converted into sulphided state, to improve the serviceability of catalyst.But use the health of the higher vulcanizing agent of sulfur content not only contaminated environment, harm operating personnel, and sulfidation is numerous and diverse, needs to drop into a lot of manpower and materials.
US4820402 discloses a kind of hydrocracking catalyst, has used β zeolite, and this patent is thought, in order to improve middle distillates oil selectivity and reduce hydrogen consumption, the silica/alumina molecular proportion at least 50:1 of the zeolite component in catalyst, general 100:1, even 200:1.The middle distillates oil selectivity order that variety classes zeolite is used for catalyst is: ZSM-20> β >Y type, process Arabic VGO, when control 60v% transforms, middle distillates oil selectivity 45-65v%, wherein acidic components are β zeolite, during conversion ratio 60v%, the catalyst middle distillates oil selectivity that this patent relates to is no more than 70v%.
US4894142 discloses a kind of hydrocracking catalyst, object is the middle distillates oil selectivity improving catalyst, be characterized in by using the dry type heat treatment method passing into inert gas being included in 676-788 DEG C of temperature water heat treatment or best 704 DEG C, obtain a kind of low acidity Y zeolite, but because this zeolitic acid is spent low, high for reaction temperature during catalytic component process feedstock oil, general more than 400 DEG C, inhibit hydrogenation reaction, the thermal cracking performance trend of zeolite strengthens, the middle distillates oil selectivity of catalyst is improved not obvious, middle distillates oil selectivity is no more than 70%.
US5447623 discloses hydrocracking catalyst and the technique thereof of a kind of compound β zeolite and Y zeolite, but this catalyst is mainly used in light oil type hydrogen cracking catalyst, embodiment 50-185 °F of naphtha yield improves obviously, and the use of β zeolite relatively only uses the catalyst activity of Y zeolite also high.Although this catalyst also may be used for middle oil type hydrocracking catalyst, due to the characteristic of used β zeolite, in middle oil type catalyst, the content range of β zeolite is generally limited between 2.5w%-10w%, and generally must be dispersed in γ-Al with the use of one
2o
3and so on the sial on macroporous aluminium oxide matrix, the middle oil type catalyst that this patent relates to is for ensureing middle distillates oil selectivity, and activity of having to force down, makes reaction temperature higher, general more than 390 DEG C, thus result in poor adaptability to raw material.
The hydrogenation component of above-mentioned hydrocracking catalyst is the metal component of sulphided state.In hydrocracking catalyst, although hydrogenation activity and cracking activity main body are provided by two kinds of components, but in the catalyst, the effect of two kinds of components is not well-separated, but the interactional coordinated effect that influences each other, hydrocracking reaction is the reaction that raw material has been worked in coordination with on two kinds of activated centres.How regulating in hydrocracking catalyst, the correlation of hydrogenation active component and cracking active component, is the important content improving the comprehensive serviceability of hydrocracking catalyst.
Phosphorus component is one of usual component of hydrocracking catalyst, and in hydrocracking catalyst, phosphorus is generally present in catalyst in two forms.A kind of mode introduces with auxiliary agent form, and general consumption is less, loads on catalyst with infusion process, and for regulating the Acidity of catalyst, the phosphorus in this catalyst generally exists in the form of an oxide; Another kind of mode is phosphorous compound, as phosphorous heteropoly acid (as phosphotungstic acid), or phosphorus containing molecular sieve (as phosphorus modified molecular sieves or skeleton phosphorus containing molecular sieve etc.).
CN200910112036.8 discloses a kind of hydrocracking catalyst and preparation method thereof, hydrocracking catalyst comprises acidic components and hydrogenation component, acidic components are phosphotungstic acid cesium salt, hydrogenation component is nickel, this catalyst for acidic components, improves the yield of hydrocracking product liquid with heteropoly acid hydrochlorate (phosphotungstic acid cesium salt).But heteropoly acid character is unstable, under the high temperature conditions can decomposition and inversion gradually, the stability of catalyst is not enough.
CN200410071124.5 discloses a kind of hydrocracking catalyst containing zeolite, be made up of the carrier loaded group VIII containing matrix and zeolite and group vib metal component, wherein said zeolite is P-contained zeolite, with oxide basis and with described zeolite for benchmark, the content of phosphorus is 0.1-15 % by weight.CN89100867.5 discloses a kind of hydrocracking catalyst containing alumo-silicate molecular sieve, and its molecular sieve is the alumo-silicate molecular sieve SAPO of nonzeolite.Though containing phosphorus in above-mentioned hydrocracking catalyst, phosphorus form is in the catalyst different, also different to the performance impact of catalyst.The oxidized catalyst of preparation needs to carry out normal vulcanizing treatment before use, and active metal is converted into sulphided state, and phosphorus is generally oxidation state or exists with the form of heteropoly acid or phosphorus containing molecular sieve, and the serviceability of catalyst needs to improve further.
Summary of the invention
The object of the present invention is to provide a kind of preparation method of metal phosphide type hydrocracking catalyst, hydrocracking catalyst of the present invention is for the treatment of heavy hydrocarbon material, and maximum produces intermediate oil.
The preparation method of metal phosphide type hydrocracking catalyst of the present invention comprises following process:
(1) preparation contains the catalyst carrier of molecular sieve and inorganic refractory oxide;
(2) dipping solution of preparation containing VI B race metallic compound, VIII race's metallic compound and inorganic phosphorus compound;
(3) catalyst carrier of dipping solution impregnation steps (1) prepared of step (2), then dry;
(4) material that step (3) obtains carries out Hydrogen activation, obtains the hydrocracking catalyst for hydrocracking reaction after activation.
In hydrocracking catalyst preparation method of the present invention, in preparation method, the consumption of various materials stock is determined by having following composition in final catalyst: with catalyst weight, the content of molecular sieve is generally 5% ~ 45%, is preferably 10% ~ 25%; Metal component of group VIB (the oxide weight meter of W and/or Mo) content is generally 10%-40%, better 15%-35%, best 18%-28%, metal component of group VIII (oxide weight in Ni and/or Co) content is generally 1%-10%, better 2%-9%, preferably 4%-8%.The mol ratio of P and VI B race metallic element is the mol ratio of 1:1 ~ 2:1, P and group VIII metal element is 1:1 ~ 1:2.Inorganic refractory oxide is surplus.The initial feed of various component can be the material source of this area routine.
In hydrocracking catalyst preparation method of the present invention, molecular sieve is generally one or more in Y molecular sieve, beta-molecular sieve, ZSM-5 molecular sieve, SAPO-11 molecular sieve, modenite, ZSM-22 molecular sieve, ZSM-23 molecular screen and mesopore molecular sieve, is preferably Y molecular sieve and/or beta-molecular sieve.Required molecular sieve can carry out the modification be suitable for, as hydrothermal treatment consists modification, acid treatment modification etc.One or more in inorganic refractory oxide is generally aluminium oxide, silica, silica-alumina (i.e. amorphous aluminum silicide), silica-alumina are scattered in aluminium oxide (being namely dispersed in the amorphous aluminum silicide in aluminium oxide) wherein, silica is covered with paint, lacquer, colour wash, etc. aluminium oxide, magnesia, zirconia, boron oxide and titanium dioxide, are preferably amorphous aluminum silicide and/or alumina component.
In hydrocracking catalyst preparation method of the present invention, the preparation of catalyst carrier can adopt the method for this area routine, obtains catalyst carrier as required material finally formed the steps such as the mixing of required ratio, shaping, dry, roasting in catalyst.Drying is generally dry 4-12 hour at 80-150 DEG C, and roasting is roasting 2-6 hour at 400-600 DEG C.
In hydrocracking catalyst preparation method of the present invention, the dipping in step (3) is saturated dipping or excess solution impregnation, and dipping can once carry out, and also can repeatedly flood.Drying process after dipping is dry 4-12 hour at 80-150 DEG C.
In hydrocracking catalyst preparation method of the present invention, the inorganic phosphorus compound in step (2) is one or more in phosphoric acid, phosphorous acid, ammonium hydrogen phosphate, ammonium dihydrogen phosphate (ADP) and ammonium phosphate etc., is preferably ammonium hydrogen phosphate, ammonium dihydrogen phosphate (ADP) and ammonium phosphate.VI B race metallic compound is the soluble compound containing W and/or Mo, and VIII race's metallic compound is the soluble compound containing Ni and/or Co.Drying process after dipping is dry 4-12 hour at 80-150 DEG C.
The course of reaction of the hydrogen reduction of activation procedure generation slaine described in step (4) hydrogen phosphatization in the inventive method, if phosphotungstate hydrogen reduction phosphatization is the chemical reaction of WP:
2WPO
5.5·0.5H
2O→2WPO
5.5+0.5H
2O
2WPO
5.5+11H→2WP+11 H
2O
Wherein WPO
5.50.5H
2o is after metallic solution dipping, the presoma formed in heating process.The XRD spectra of the WP generated is that stronger diffraction maximum all appears in 21.04 °, 28.68 °, 31.10 °, 43.2 °, 44.6 °, 46.5 ° places at 2 θ, identical with the standard spectrogram (PDF-29-1364) of WP.
The H of the phosphide of Ni
2reduction process: (1) Ni
2p
2o
7→ Ni; (2) P presoma reduction, and generate Ni with Ni
12p
5; (3) Ni
12p
5further reduction generates Ni
2p.Being that stronger diffraction maximum all appears in 40.7 °, 44.6 °, 54.2 ° and 54.9 ° of places at 2 θ, is Ni
2the diffraction maximum of P.
In hydrocracking catalyst preparation method of the present invention, Hydrogen activation process and the condition of step (4) are: under a hydrogen atmosphere, be that 2-10 DEG C/min rises to 300-500 DEG C from room temperature with heating rate, then be 0.5-2 DEG C/min with heating rate, be warming up to 600-750 DEG C, and at intensification outlet temperature constant temperature 2-4 hour.Hydrogen purity is wherein greater than 95%(volume), hydrogen gas space velocity is 50-1000h
-1, pressure can be normal pressure to 1MPa, be preferably normal pressure.
Hydrocracking catalyst prepared by the inventive method, for vacuum distillate be raw material inceasing output of jet fuel and diesel oil hydrocracking process in, reaction pressure preferably at 6-20MPa, hydrogen to oil volume ratio 500:1-2000:1, raw material volume air speed 0.5-2.0hr
-1, reaction temperature 350-410 DEG C.Feedstock oil, before carrying out hydrocracking, carries out hydrofinishing, and organic nitrogen content is wherein reduced to 50 below μ g/g, is preferably 20 below μ g/g.
In hydrocracking catalyst preparation process of the present invention, introduce the phosphorus-containing compound matched with active metal component, by suitable process, phosphorus and active metal are formed the metal phosphorizing state of bonding state to a certain degree, show by analyzing, in catalyst prepared by the inventive method, there is metal phosphide, and common for hydrocracking catalyst sulfidation is cancelled, adopt hydrogen reducing mode to carry out activation process to metal-containing compound with containing the catalyst of phosphorus component, make metallic compound be converted into metal phosphide.The phosphatization state of active metal component has desirable Hydrogenation on the one hand, and the acid centre of phosphatization state to molecular sieve of active metal component creates certain effect on the other hand.Show by analysis, the B acid site of active metal phosphatization state and molecular sieve interacts, significantly improve the acid strength distribution on zeolite, strong acid is reduced, middle intensity acid increases, acid site number increases to some extent, and L acid site number reduces relatively, can reduce fine melt function like this, increase the activity that moderate strength acid amount is conducive to improving catalyst, reduce reaction temperature, and improve the selective of intermediate oil (kerosene and diesel oil).Hydrocracking catalyst of the present invention can significantly improve the nitrogen resistance of catalyst simultaneously, and when using identical acidic components, the resistance to nitrogen ability of catalyst of the present invention significantly improves.In addition, method for preparing catalyst of the present invention has the interaction between suitable active metal component and carrier, ensures the stability of active constituent loading on the one hand, makes catalyst cracking performance and Hydrogenation play better synergy on the other hand.
Detailed description of the invention
Hydrocracking catalyst prepared by the inventive method is applicable to hydrocracking process, be particularly suitable for treatment of heavy hydrocarbon material, the boiling range of heavy hydrocarbon material is generally within the scope of 250-600 DEG C, and preferably within the scope of 300-550 DEG C, wherein the cut of more than 70w% is more than 350 DEG C.There is the feedstock oil of These characteristics as gas oil, vacuum distillate, de-pitch prill oil, catalytic cracking recycle oil, shale oil, coal tar wet goods.Reaction condition generally under hydrogen existence condition, reaction pressure 5-20MPa, hydrogen to oil volume ratio 100:1-5000:1, raw material volume air speed 0.1-5.0hr
-1, reaction temperature 350-450 DEG C.Hydrocracking process generally comprises the hydrofinishing of leading portion, for removing most S, N in feedstock oil, and the saturated severity reducing the operation of hydrocracking section of polycyclic aromatic hydrocarbon, but this catalyst can reduce the severity of refining stage operation, embodies good effect when high nitrogen-containing.
Following embodiment describes the present invention, but does not limit its scope.Under hydrogen atmosphere, reduction activation is carry out under normal pressure.
Comparative example 1
By 25.3 grams of Y sieves (butt 95wt%), 71.4 grams of amorphous aluminum silicide (SiO
2content 50wt%, pore volume 0.85ml/g, specific area 370m
2/ g, butt 70wt%), 122.9 grams of macroporous aluminium oxides (pore volume 1.0ml/g, specific area 400m
2/ g, butt 70wt%), 133.3 grams of adhesives (butt 30wt%, the mol ratio of nitric acid and little porous aluminum oxide is 0.3) put into roller mixed grind, add water, be rolled into paste, extrusion, extrude bar 110 DEG C of dryings 4 hours, then 550 DEG C of roastings 4 hours, obtain carrier T-1, character is in table 1.
The maceration extract room temperature immersion of carrier tungstenic and nickel (ammonium metatungstate and nickel nitrate) 2 hours, 120 DEG C of dryings 4 hours, 500 DEG C of roastings 4 hours, obtain catalyst B J-1, catalyst property was in table 2.Catalyst uses the common vulcanizing treatment of row of advancing, and sulfidation is with hydrogen sulfide containing hydrogen 230 DEG C of constant temperature 8 hours, 280 DEG C of constant temperature 8 hours, 320 DEG C of constant temperature 8 hours.
Embodiment 1
Prepare the maceration extract that weight concentration is 30% ammonium dihydrogen phosphate (ADP) and tungsten and nickel, by the carrier T-1 of comparative example 1 impregnation fluid prepared 2 hours, 120 DEG C of dryings 4 hours, then reduction activation in a hydrogen atmosphere, reduction activation program, for rise to 450 DEG C with 5 DEG C/min from room temperature, is 2 DEG C/min with heating rate, rises to 700 DEG C from 450 DEG C, and 700 DEG C of constant temperature 2 hours, be prepared into catalyst C-1 of the present invention.
Through XRD analysis (under nitrogen protection condition), can find out, there is in catalyst of the present invention tungsten phosphide (WP) and nickel phosphide (Ni
2p) characteristic diffraction peak, defines the phosphatization state of active metal.
Comparative example 2
By 14.7 grams of beta-molecular sieves (butt 95wt%), 151.4 grams of amorphous aluminum silicide (SiO
2content 50wt%, pore volume 0.85ml/g, specific area 370m
2/ g, butt 70wt%), 57.1 grams of macroporous aluminium oxides (pore volume 1.0ml/g, specific area 400m
2/ g, butt 70wt%), 133.3 grams of adhesives (butt 30wt%, the mol ratio of nitric acid and little porous aluminum oxide is 0.3) put into roller mixed grind, add water, be rolled into paste, extrusion, extrude bar 110 DEG C of dryings 4 hours, then 550 DEG C of roastings 4 hours, obtain carrier T-2, character is in table 1.
The maceration extract room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C of dryings 4 hours, 500 DEG C of roastings 4 hours, obtain catalyst B J-2, catalyst property was in table 2.Catalyst uses the common vulcanizing treatment of row of advancing, and sulfidation is with hydrogen sulfide containing hydrogen 230 DEG C of constant temperature 8 hours, 280 DEG C of constant temperature 8 hours, 320 DEG C of constant temperature 8 hours.
Embodiment 2
Prepare the maceration extract that weight concentration is 40% ammonium dihydrogen phosphate (ADP) and tungstenic and nickel, by the carrier T-2 of comparative example 2 impregnation fluid prepared 2 hours, 100 DEG C of dryings 6 hours, then Hydrogen activation is carried out in a hydrogen atmosphere, first rise to 350 DEG C with 10 DEG C/min from room temperature, be 1 DEG C/min with heating rate, rise to 600 DEG C from 350 DEG C, and 600 DEG C of constant temperature 4 hours, prepare phosphatization transition-metal catalyst C-2.
Comparative example 3
By 8.4 grams of Y molecular sieves (butt 95wt%), 85.7 grams of amorphous aluminum silicide (SiO
2content 50wt%, pore volume 0.85ml/g, specific area 370m
2/ g, butt 70wt%), 131.42 grams of macroporous aluminium oxides (pore volume 1.0ml/g, specific area 400m
2/ g, butt 70wt%), 133.3 grams of adhesives (butt 30wt%, the mol ratio of nitric acid and little porous aluminum oxide is 0.3) put into roller mixed grind, add water, be rolled into paste, extrusion, extrude bar 110 DEG C of dryings 4 hours, then 550 DEG C of roastings 4 hours, obtain carrier T-3, character is in table 1.
The maceration extract room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C of dryings 4 hours, temperature programming 500 DEG C of roastings 4 hours, obtain catalyst B J-3, catalyst property is in table 2.Catalyst uses the common vulcanizing treatment of row of advancing, and sulfidation is with hydrogen sulfide containing hydrogen 230 DEG C of constant temperature 8 hours, 280 DEG C of constant temperature 8 hours, 320 DEG C of constant temperature 8 hours.
Embodiment 3
Prepare the maceration extract that weight concentration is 40% ammonium hydrogen phosphate and tungstenic and nickel, by the carrier T-3 of comparative example 3 impregnation fluid prepared 2 hours, 110 DEG C of dryings 6 hours, then activation process is carried out in a hydrogen atmosphere, first rise to 450 DEG C with 8 DEG C/min from room temperature, be 1 DEG C/min with heating rate, rise to 650 DEG C from 450 DEG C, and 650 DEG C of constant temperature 4 hours, prepare phosphatization transition-metal catalyst C-3.
the physico-chemical property of table 1 catalyst carrier.
| Numbering | T-1 | T-2 | T-3 |
| Molecular sieve, wt% | 12.0 | 7.0 | 4.0 |
| Amorphous aluminum silicide, wt% | 25.0 | 53.0 | 30.0 |
| Macroporous aluminium oxide, wt% | 43.0 | 20.0 | 46.0 |
| Adhesive, wt% | 20.0 | 20.0 | 20.0 |
| Pore volume, ml/g | 0.73 | 0.76 | 0.78 |
| Specific area, m 2/g | 425 | 392 | 383 |
table 2 catalyst composition and character.
| Numbering | BJ-1 | C-1 | BJ-2 | C-2 | BJ-3 | C-3 |
| WO 3，wt% | 16.58 | - | 22.82 | - | 23.27 | - |
| WP，wt% | - | 17.66 | - | 22.8 | - | 24.16 |
| NiO，wt% | 4.36 | - | 5.73 | - | 5.81 | - |
| Ni 2P，wt% | - | 3.87 | - | 5.46 | - | 6.18 |
| Pore volume, ml/g | 0.56 | 0.54 | 0.53 | 0.56 | 0.55 | 0.57 |
| Specific area, m 2/g | 324 | 228 | 279 | 296 | 281 | 301 |
table 3 feedstock oil main character.
| Feedstock oil | Vacuum distillate |
| Density (20 DEG C), kg/m 3 | 920.6 |
| Boiling range, DEG C | |
| IBP/10% | 328/413 |
| 30%/50% | 450/471 |
| 70%/90% | 493/522 |
| 95%/EBP | 534/545 |
| Nitrogen, μ g/g | 1575 |
| Carbon, wt% | 85.25 |
| Hydrogen, wt% | 11.96 |
| Carbon residue, wt% | 0.35 |
table 4 COMPARATIVE CATALYST's evaluation result of the present invention.
| Catalyst | BJ-1 | C-1 | BJ-2 | C-2 | BJ-3 | C-3 |
| Refined oil nitrogen content, μ g/g | 3 | 25 | 5 | 30 | 8 | 35 |
| Reaction temperature, DEG C | 383 | 365 | 390 | 374 | 393 | 378 |
| Product yield and character | ||||||
| Heavy naphtha | ||||||
| Yield, wt% | 9 | 8.8 | 8.9 | 6.8 | 9.7 | 10.1 |
| Virtue is dived, wt% | 61.9 | 62.5 | 62.8 | 63.5 | 60.8 | 61.6 |
| Jet fuel | ||||||
| Yield, wt% | 25.3 | 23.5 | 23.8 | 22.8 | 22.6 | 23 |
| Smoke point, mm | 24 | 27 | 23 | 27 | 22 | 27 |
| Aromatic hydrocarbons, v% | 8.9 | 8.2 | 10 | 8.6 | 12.4 | 10.7 |
| Diesel oil | ||||||
| Yield, wt% | 36.5 | 35.7 | 35.9 | 37.9 | 32.6 | 33.5 |
| Cetane number | 58.2 | 62.8 | 56.4 | 60.5 | 55.5 | 60.9 |
| Tail oil | ||||||
| Yield, wt% | 24.2 | 29.1 | 28.5 | 30.1 | 28.6 | 28.9 |
| BMCI value | 9.8 | 8.4 | 10 | 8.9 | 11 | 9.4 |
| Chemical hydrogen consumption, wt% | 2.21 | 2.21 | 2.18 | 2.34 | 2.26 | 2.23 |
| Middle distillates oil selectivity, wt% | 83.7 | 84.6 | 85.6 | 87.8 | 80.2 | 82.6 |
Embodiment 4
This embodiment describes the Activity evaluation of catalyst and the comparative example catalyst prepared by the present invention.Fixed bed hydrogenation experimental rig is evaluated.
Appreciation condition is: reaction stagnation pressure 14.7MPa, hydrogen to oil volume ratio 1200, raw material volume air speed 1.0h
-1, use vacuum distillate (VGO) as feedstock oil, feedstock oil character lists in table 3.Evaluated under above-mentioned process conditions by the catalyst prepared in above-mentioned each example, the evaluation result obtained lists in table 4.
As can be seen from Table 4, catalyst of the present invention activity when refined oil nitrogen content significantly improves is higher, and product property is better.
Claims (10)
1. a preparation method for metal phosphide type hydrocracking catalyst, is characterized in that comprising following process:
(1) preparation contains the catalyst carrier of molecular sieve and inorganic refractory oxide;
(2) dipping solution of preparation containing VI B race metallic compound, VIII race's metallic compound and inorganic phosphorus compound, wherein VI B race metallic compound is the soluble compound containing W and/or Mo, and VIII race's metallic compound is the soluble compound containing Ni and/or Co;
(3) catalyst carrier of dipping solution impregnation steps (1) prepared of step (2), then dry;
(4) material that step (3) obtains carries out Hydrogen activation, the hydrocracking catalyst for hydrocracking reaction is obtained after activation, wherein the mol ratio of P and VI B race metallic element is 1:1 ~ 2:1, the mol ratio of P and group VIII metal element is 1:1 ~ 1:2, Hydrogen activation process and condition are: under a hydrogen atmosphere, be that 2-10 DEG C/min rises to 300-500 DEG C from room temperature with heating rate, then be 0.5-2 DEG C/min with heating rate, be warming up to 600-750 DEG C, and at intensification outlet temperature constant temperature 2-4 hour;
In preparation method, the consumption of various materials stock is determined by having following composition in final catalyst: with catalyst weight, the content of molecular sieve is 5% ~ 45%, with the content of W and/or Mo oxide basis for 10%-40%, in the oxide content of Ni and/or Co for 1%-10%; Inorganic refractory oxide is surplus.
2. in accordance with the method for claim 1, it is characterized in that: the content of molecular sieve is 10% ~ 25%, with the content of W and/or Mo oxide basis for 15%-35%, with the content of Ni and/or Co oxide basis for 2%-9%.
3. in accordance with the method for claim 1, it is characterized in that: the molecular sieve in hydrocracking catalyst is one or more in Y molecular sieve, beta-molecular sieve, ZSM-5 molecular sieve, SAPO-11 molecular sieve, modenite, ZSM-22 molecular sieve, ZSM-23 molecular screen and mesopore molecular sieve.
4. according to the method described in claim 1 or 3, it is characterized in that: the molecular sieve in hydrocracking catalyst is Y molecular sieve and/or beta-molecular sieve.
5. in accordance with the method for claim 1, it is characterized in that: inorganic refractory oxide is aluminium oxide, silica, silica-alumina and one or more in being scattered in aluminium oxide silica-alumina.
6. according to the method described in claim 1 or 5, it is characterized in that: inorganic refractory oxide is silica-alumina and/or aluminium oxide.
7. in accordance with the method for claim 1, it is characterized in that: the dipping in step (3) is saturated dipping or excess solution impregnation, the drying process after dipping is dry 4-12 hour at 80-150 DEG C.
8. in accordance with the method for claim 1, it is characterized in that: the inorganic phosphorus compound in step (2) is one or more in phosphoric acid, phosphorous acid, ammonium hydrogen phosphate, ammonium dihydrogen phosphate (ADP) and ammonium phosphate.
9. in accordance with the method for claim 1, it is characterized in that: the hydrogen purity of Hydrogen activation process is greater than 95%, hydrogen gas space velocity is 50-1000h
-1.
10. the application of hydrocracking catalyst prepared by method described in the arbitrary claim of claim 1 to 9, for with vacuum distillate be raw material inceasing output of jet fuel and diesel oil hydrocracking process in, reaction pressure is 6-20MPa, hydrogen to oil volume ratio 500:1-2000:1, raw material volume air speed 0.5-2.0hr
-1, reaction temperature 350-410 DEG C, feedstock oil, before carrying out hydrocracking, carries out hydrofinishing, and organic nitrogen content is wherein reduced to 50 below μ g/g.
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