CN103055887B - Preparation method of hydrotreating catalyst composition - Google Patents

Abstract

The invention discloses a preparation method of a hydrotreating catalyst composition. The method comprises the steps of subjecting a salt mixed solution A in which CO2 is dissolved to react with an alkaline solution B containing aluminium to prepare gel, when reaction is completed, controlling the pH value of pulp in a reaction tank to be 7.0-9.0, preparing a mixture of an NixWyOz composite oxide precursor and an Al2O3 precursor, pulping the mixture and MoO3 to prepare a dry body, and then forming, drying and roasting the dry body to obtain a final catalyst, wherein the salt mixed solution A contains components Ni and W. The method has the beneficial effects that the problem that bulk phase catalysts are difficult to form is solved; the physical and chemical properties of the catalyst are adjusted, and the catalyst has the advantages of larger specific surface area, uniform pore distribution and high effective utilization rate of reactive metals; and the catalyst is especially suitable for the ultra-deep desulfurization reaction for producing ultra-clean diesel.

Description

The preparation method of hydrotreatment catalyst composition

Technical field

The present invention relates to a kind of preparation method of hydrotreatment catalyst composition, particularly the catalyst clean preparation method of the removing impurities matter process such as hydro carbons ultra-deep hydrodesulfuration, denitrogenation.

Background technology

Worldwide while the further in poor quality of feedstock oil, fuel oil specification is but more harsh to the index of transportation fuel, nearly ten years, comprise North America, concept that Europe, Japanese many countries propose ultra-low-sulphur diesel (ULSD) constantly formulate new fuel oil specification to limit the content of sulphur, aromatic hydrocarbons etc. in motor petrol and diesel oil, therefore, exigence develops the catalyst of high hydrodesulfurization activity to meet the needs of diesel oil ultra-deep hydrodesulfuration.

Containing the sulfur-containing compound that various structures is different with molecular weight in petroleum distillate, comprise mercaptan, thioether, thiophenes.These sulfur-containing compounds, under the industrial hydrodesulfurization reaction condition of routine, can carry out hydrogenation and desulphurization reaction and from raw material, remove sulphur atom (sulphidic conversion of such as mercaptan, straight chain and ring-type is saturated hydrocarbons or aromatic compound).In deep desulfuration stage (sulfur content is lower than 500 μ g/g) and ultra-deep desulfurization stage (sulfur content is lower than 50 μ g/g), the sulfur-containing compound in diesel oil distillate is mainly dibenzothiophenes class sulfide.The reactivity of this kind of sulfide and substituent quantity and position closely related.4,6-dimethyl Dibenzothiophene class sulfide is generally the most difficult class sulfide removed, because the methyl of sulphur atom next-door neighbour makes to create between sulphur atom and the activated centre of catalyst sterically hindered, the activated centre of the not accessible reaction of sulphur atom, thus causes reaction rate significantly to decline.Therefore, deep hydrodesulfurizationof be realized and must develop catalyst dibenzothiophenes and derivative thereof to high hydrogenation activity.

Bulk phase catalyst refers to that the loaded catalyst be dispersed on carrier with active constituent is relative, not with inactive carrier for carrier.Catalyst major part is made up of active component, and the content of active constituent is generally unrestricted, sometimes also claims body catalyst.Bulk phase catalyst does not have the support of carrier, its pore passage structure is made up of activated metal component completely, surface that can be close at reactant molecule all can play active function, therefore improves specific area and the pore volume of bulk phase catalyst, just can improve its hydrogenation activity significantly.

Compared with load hydrogenation catalyst, body phase hydrogenation catalyst activated centre density wants high a lot, there is superelevation desulphurizing activated, denitrogenation and arene saturating activity, can produce under existing refinery facilities and operating condition and meet Europe V standard or without sulfur diesel product, and greatly improve the disposal ability of device, meet factory and reduce basic device investment, solve old device and expand the requirement that new equipment production high-quality oil product and can be met, therefore bulk phase catalyst is owing to can have high tenor, the advantage of strong hydrogenation function, more and more be widely used in production super-low sulfur, low nitrogen, the fine-quality diesel oil of low aromatic hydrocarbons.

The petroleum refining industry of 21st century must follow the strategy of sustainable development, the principle that must pay attention to economic benefit, protection of the environment simultaneously and economize on resources.Therefore, adopt the preparation method of non-environmental-pollution to produce bulk phase catalyst and become more important.Existing coprecipitation method Kaolinite Preparation of Catalyst technology, uses NH mostly ₃h ₂o is as precipitating reagent, and this is by producing a large amount of waste water containing ammonia, nitrogen, to environment.

US 4,880,526 discloses a kind of containing the bulk phase catalyst and preparation method thereof of Ni, Mo, W, Co high activity for hydrotreatment.The method first prepares alumina gel, then adds and mixes containing active metal component solubility salt, dry, roasting.After also can taking first to prepare alumina gel in addition, dry, mix with containing active metal component non-solubility salt, roll, dry, roasting, or different activities metal component adopt different above-mentioned two kinds of modes any one be prepared., there is the problem that using rate of metal is lower in the similar kneading method of this method.

US 6,299, method disclosed in 760 is a kind of comparatively excellent bulk phase catalyst for hydrotreatment and preparation method thereof, but in catalyst preparing involved in its patent, the metal dust containing Ni-Mo or Ni-Mo-W is first prepared in the shaping employing of catalyst, then with aluminium oxide bonding or dewater after the metal dust of Ni-Mo or Ni-Mo-W is mixed with alumina gel, extrusion, drying.The catalyst metal content prepared due to the method is high, often lacks enough interactions catalyst strength can be caused poor between metal and aluminium oxide.Active component part is made up of a large amount of metal, and in formation Ni-Mo or Ni-Mo-W powder process, have some interior metal components can not be fully utilized and cause loss of activity, this problem is not solved by simply bonding.CN1342102A discloses a kind of mixed metal catalyst, and concrete grammar is for obtain three kinds of active metal co-precipitation, and its main weak point is the cooperation effect do not found between different activities metal.US 6,162,350, CN 1339985A discloses a kind of mixed metal catalyst composition, keeps at least one metal to be solid-state in preparation process, form another kind of soild oxide in this solid metal compound surface reaction, be finally formed as core-shell type composition.The method can not make different metal obtain good cooperation.

CN1951561A discloses a kind of preparation method of hydrotreating catalyst, comprising: (1) coprecipitation generates Ni _xw _yo _zcomposite oxides precursor; (2) Ni _xw _yo _zcomposite oxides precursor and MoO ₃making beating mixing, filtration; (3) shaping, activation is final catalyst.The precipitating reagent that the method adopts is Ammonia, there is the problem of ammonia and nitrogen pollution, catalyst metal content is high simultaneously, specific surface area of catalyst is little, pore size distribution$ is uneven, cause active metal bad dispersibility, between active metal component, lack cooperation effect, the Hydrogenation of its active metal can not be fully played.

CN101172261A discloses the standby hydrogenation catalyst of a kind of body phase legal system, and this catalyst adopts the saline mixed solution of active metal Ni, W component and auxiliary agent and sodium aluminate solution co-precipitation to generate Ni _xw _yo _zcomposite oxides precursor, then with MoO ₃making beating mixing, filter, shaping, activation is for final catalyst.Aluminium in the method catalyst, all from sodium metaaluminate, when avoiding ammoniacal liquor plastic, produces ammonia, polluted by nitrogen.When but sodium metaaluminate replaces aluminium ion salt as aluminium source, when sodium metaaluminate instead of the solvable inorganic aluminate such as aluminium chloride, aluminum nitrate do aluminium source time, a large amount of NO will be reduced ₃ ^-, Cl ^-deng heteroion, prepare precipitated metal thing bad adhesion, cause shaping of catalyst difficulty.

Existing coprecipitation method Kaolinite Preparation of Catalyst technology, adopts sodium metaaluminate to do aluminium source and precipitating reagent, avoids producing ammonia, polluted by nitrogen in catalyst preparation process.But because active metallic content is higher, the shaping of bulk phase catalyst becomes one of bulk phase catalyst preparation process committed step, the caking property of precipitated metal thing can be increased in body phase method metalliferous material containing suitable heteroion, contribute to the material extruding that active metallic content is high.If sodium metaaluminate instead of the solvable inorganic aluminates such as aluminium chloride, aluminum nitrate, aluminum sulfate and does aluminium source, a large amount of NO will be reduced ₃ ^-, Cl ^-, SO ₄ ^2-deng heteroion, the composite oxides precursor peptization of preparation is poor, metalliferous material difficult forming.Coprecipitation method Kaolinite Preparation of Catalyst also has a difficult point to be that the metal mixture grain size difference that obtains of different aluminium sources and precipitating reagent is large and then have considerable influence to the specific area of catalyst, intensity.In order to decreasing pollution, how to solve the problem adopting sodium metaaluminate replacement ammoniacal liquor to do the materials from bonding difference of the body phase clean method for preparing generation of precipitating reagent.How to allow Ni prepared by coprecipitation method _xw _yo _zcomposite oxides and Al ₂o ₃the mixture crystal grain homoepitaxial of precursor, catalyst has the scattered feature of bigger serface, good pore structure, active metal, improves catalyst removal dibenzothiophenes class large molecule sulfur compound hydrogenation activity.

Summary of the invention

For the deficiencies in the prior art, the invention provides a kind of preparation method of hydrotreatment catalyst composition, particularly adopt clean method for preparing, solve the problem of the shaping difficulty of bulk phase catalyst simultaneously, catalyst has the physico-chemical property good compared with Large ratio surface sum uniform bore distribution etc., and larger pore volume is conducive to large hydrocarbon molecules turnover, can process heavier raw material, can be used for, in hydrodesulfurization, hydrodenitrogeneration reaction, being particularly useful in the ultra-deep desulfurization reaction of production super clean diesel oil.

There is the assorted anion of appropriate amount in material, the caking property increasing metalliferous material is conducive to shaping of catalyst.In plastic process, if want extra to add negative heteroion, so to consider and may bring different cation, as metal, H ⁺, NH ₄ ⁺plasma, these all may change composition, the plastic pH value of catalyst and bring ammonia and nitrogen pollution, and the increase of a large amount of ion simultaneously also increases the difficulty of washing.Meanwhile, the Ni that different aluminium sources and precipitating reagent obtain _xw _yo _zcomposite oxides and Al ₂o ₃the mixture grain size of precursor and then have considerable influence to the specific area of catalyst, intensity.The present invention is found by a large amount of experiments, passes into CO when metallic solution and sodium metaaluminate plastic ₂gas, avoid the ammonia and nitrogen pollution adopting conventional ammoniacal liquor to do precipitating reagent to bring, reaction generates HCO ₃ ^-or CO ₃ ^2-ion adds the caking property of metalliferous material, is conducive to shaping of catalyst, can also improve the physico-chemical property of catalyst.

The preparation method of hydrotreatment catalyst composition of the present invention, comprising: (1), coprecipitation generate Ni _xw _yo _zcomposite oxides precursor and Al ₂o ₃the mixture of precursor; (2), by the mixture of step (1) gained and MoO ₃making beating mixing, filtration, drying; (3), step (2) gained material obtains final catalyst through shaping, dry and roasting, and wherein step (1) process is as follows: preparation, containing Ni, W component saline mixed solution A, passes into CO in solution A ₂gas, preferably makes CO in solution A ₂concentration is saturated; Preparation containing the alkaline solution B of aluminium, by solution B with pass into CO ₂the solution A reaction plastic of gas, at the end of reaction, the pH value controlling slurries in retort is 7.0 ~ 9.0, makes composite oxides Ni _xw _yo _zprecursor and Al ₂o ₃the mixture of precursor, wherein adds CO ₂al in the total amount of gas and alkaline solution B ₂o ₃mol ratio be 2 ~ 8.

The preparation process of described hydrogenating catalyst composition is preferably carried out in airtight retort.

Water purification described in the present invention generally adopts deionized water or distilled water.

In step (1) solution B with pass into CO ₂the solution A reaction plastic of gas, can adopt and flow plastic method, also can adopt tank plastic method and change pH values plastic method, solution B be added to and pass into CO ₂plastic in the solution A of gas, also can pass into CO ₂gas solution A adds plastic in solution B.Also above-mentioned two kinds of methods can be combined.And when flowing plastic, regulate the pH value of slurries in retort to be 7.0 ~ 9.0, when adopting tank plastic method plastic, at the end of control slurries in retort pH value be 7.0 ~ 9.0.

In the inventive method, the described alkaline solution B containing aluminium can be inorganic or organic alkaline aluminum contained compound solution, is preferably sodium aluminate solution.

Hydrotreatment catalyst composition of the present invention, containing Mo, W, Ni tri-kinds of metal components, wherein W, Ni exist with composite oxides form: Ni _xw _yo _z, z=x+3y, Mo exist with oxide form: MoO ₃, composite oxides Ni _xw _yo _zthe ratio of middle x and y is 1:8 ~ 8:1, is preferably 1:4 ~ 4:1, composite oxides Ni _xw _yo _zwith oxide M oO ₃weight ratio be 1:10 ~ 10:1, be preferably 1:5 ~ 5:1.With the weight of hydrotreatment catalyst composition for benchmark, composite oxides Ni _xw _yo _zwith oxide M oO ₃gross weight content be 40% ~ 95%, be preferably 45% ~ 85%, alumina content is 5% ~ 60%, be preferably 15% ~ 55%.The specific area of hydrotreatment catalyst composition of the present invention is 150 ~ 450m ²/ g, pore volume is 0.20 ~ 0.60ml/g.

In the inventive method, required catalyst promoter and/or addO-on therapy can be added in a step in above-mentioned steps or a few step.Auxiliary agent generally comprises one or more in P, F, Ti, Si, B, Zr etc.AddO-on therapy is generally one or more in silica, zirconia, clay, sial, titanium oxide, magnesia etc.Auxiliary agent and/or the addO-on therapy weight content in carbon monoxide-olefin polymeric is 0 ~ 50%, is preferably 1% ~ 20%.

Present invention employs sodium metaaluminate is aluminium source, by its be dissolved with CO ₂gas containing carrying out plastic reaction in Ni, W component saline mixed solution, to make in plastic thing, except forming precipitation of hydroxide, after reaction, to define CO ₃ ^2-or HCO ₃ ^-, after adding heteroion, precipitated metal thing caking property strengthens, and makes catalyst easily shaping, simultaneously CO ₃ ^2-or HCO ₃ ^-can remove during ion roasting, pollution-free and without the need to washing, and generate Ni _xw _yo _zcomposite oxides and Al ₂o ₃the mixture homogeneous grain size of precursor, improves the physico-chemical property of catalyst, has larger specific area and pore volume, reasonably pore structure.Simultaneously in roasting process, release a certain amount of carbon dioxide, under the percussion of gas, not only improve the pore structure of catalyst, but also make more metal active position be exposed to the surface of catalyst, improve the utilization rate of active metal.The inventive method is pollution-free in preparation process, catalyst easy-formation, there is larger specific area and pore volume, reasonably pore size distribution, originally intensive active metal decentralization can be improved, fully expose the high hydrogenation sites of Ni-W, make containing heteroatomic labyrinth hydrocarbon molecule have more multimachine can close to Ni-W high activity center effective hydrogenation, reduction removing impurities matter sterically hindered, more easily imurity-removal.

Accompanying drawing explanation

Fig. 1 is electronic scanner microscope (SEM) figure of catalyst D.

Fig. 2 is electronic scanner microscope (SEM) figure of reference agent G.

Detailed description of the invention

In the inventive method step (1), preparation is containing the saline mixed solution of active metal Ni, W component, and wherein Ni is in the weight concentration of NiO for 20 ~ 80g/L, and preferably 30 ~ 60g/L, W are with WO ₃the weight concentration of meter is 50 ~ 120g/L, preferably 70 ~ 100g/L; Can be one or more in nickelous sulfate, nickel nitrate, basic nickel carbonate, nickel chloride containing nickel salt, tungsten salt can be one or more in sodium tungstate, ethyl ammonium metatungstate, ammonium metatungstate; Preparation is 20 ~ 80gAl containing the weight concentration of the alkaline solution of aluminium ₂o ₃/ L, is preferably 30 ~ 60gAl ₂o ₃/ L.

In the inventive method, CO used in step (1) ₂volumetric concentration 70v% ~ the 99v% of gas, is preferably 80v% ~ 95v%.Be dissolved with CO ₂the solution A of gas and the plastic process of solution B are preferably carried out in airtight retort.Gelling temperature described in step (1) is 30 ~ 80 DEG C, preferably 40 ~ 70 DEG C, and gelation time is 0.5 ~ 5.0 hour.Preferably through aging after plastic, ageing time is 1.0 ~ 5.0 hours, is preferably 0.5 ~ 3.0 hour.

In step (2), the mixture of step (1) gained can filter or not filter, then solid molybdenum trioxide is added, then filter and obtain filter cake, filter cake can carry out washing or not washing, filter cake, at 50 ~ 150 DEG C, preferably dehydrates under 50 ~ 100 DEG C of conditions, 0.5 ~ 24.0 hour drying time, be preferably 1 ~ 8 hour, obtain Ni _xw _yo _zcomposite oxides precursor, MoO ₃with Al ₂o ₃the mixture of precursor.

Drying described in step (3) and roasting can adopt this area normal condition, as 50 ~ 200 DEG C of dryings 1 ~ 48 hour, 450 ~ 600 DEG C of roastings 1 ~ 24 hour, are preferably 2 ~ 8 hours.

Catalyst of the present invention, for the ease of shaping, can add extrusion aid.Described extrusion aid is one or more in sesbania powder, methylcellulose, starch, polyvinyl alcohol and PVOH, preferred sesbania powder.

In the inventive method, the shape of catalyst can be sheet, spherical, cylindrical bars and irregular bar (clover, bunge bedstraw herb), preferably cylindrical bars and irregular bar (clover, bunge bedstraw herb) as required.The diameter of carrier can be the slice of 0.8 ~ 2.0mm and the thick bar of > 2.5mm.

Catalyst of the present invention has higher hydrodesulfurization and hydrodenitrogeneration reactivity worth, and can be used for diesel oil hydrogenation ultra-deep desulfurization technique, this catalyst also can be used in other hydrofinishing and hydroprocessing technique.

The solution of the present invention and effect is further illustrated below by specific embodiment.Wt% is mass fraction, and v% is volume fraction.The specific area of catalyst and pore structure adopt low temperature liquid nitrogen absorption method method to measure, and intensity adopts side pressure method to measure.

Embodiment 1

Add 1000mL water in retort, add 65g nickel chloride respectively, 46g ammonium metatungstate dissolves, preparating acid sex work solution A, passes into the CO that concentration is 85v% in solution A ₂, make CO in the gas in tank ₂concentration is 80v%, hermetically sealed can.In dissolving tank, add 500mL water, then add sodium metaaluminate 30 grams dissolving, prepare alkaline working solution B.React plastic with working solution A, gelling temperature 45 DEG C, gelation time 1 hour in retort solution B being added sealing, at the end of the pH value of plastic slurries be 8.5.CO in water purification neutralization reaction tank ₂al in the total amount of gas and alkaline working solution B ₂o ₃mol ratio is 3.2.After plastic aging 2 hours.Then filter, filter cake adds 600ml water purification and 12.4g molybdenum trioxide, making beating stirs, and filter, filter cake was 80 DEG C of dryings 5 hours, then extruded moulding, wash 3 times with water purification, wet bar 100 DEG C of dryings 5 hours, 450 DEG C of roastings 4 hours, obtain final catalyst A, composition and main character are in table 1.

Embodiment 2

Compared with embodiment 1, difference is: by the catalyst B constituent content proportioning in table 1, will be dissolved with CO ₂the solution A of gas and solution B stream adds plastic in retort, the pH value regulating slurries in retort is 8.5, gelling temperature 45 DEG C, and gelation time 1 hour, finally obtains catalyst B, and composition and main character are in table 1.

Embodiment 3

According to the method for embodiment 1, by the constituent content proportioning of the catalyst C in table 1, add 1200ml water purification in retort after, add nickel chloride, ammonium metatungstate and zirconium oxychloride preparating acid sex work solution A, in dissolving tank, then add sodium metaaluminate alkalescence working solution B.The CO that concentration is 90v% is passed in retort solution A ₂, make CO in the gas in tank ₂concentration is 85v%, hermetically sealed can, and temperature rises to 55 DEG C.Plastic in retort solution B being added dropwise to sealing, gelling temperature 55 DEG C, gelation time 1.5 hours, at the end of the pH value of plastic slurries be 7.5.CO is added in plastic process ₂al in the total amount of gas and alkaline working solution B ₂o ₃mol ratio is 4.0.After plastic aging 1.5 hours.Then filter, filter cake adds 500ml water purification and 10.1g molybdenum trioxide, making beating stirs, and filter, filter cake was 70 DEG C of dryings 7 hours, then extruded moulding, wash 2 times with water purification, wet bar 100 DEG C of dryings 8 hours, 550 DEG C of roastings 3 hours, obtain final catalyst C, composition and main character are in table 1.

Embodiment 4

According to the method for embodiment 1, by the constituent content proportioning of the catalyst D in table 1, add 800mL water purification in dissolving tank A after, add nickel chloride, ammonium metatungstate and phosphorylated ligand relieving haperacidity sex work solution A, in dissolving tank B, then add sodium metaaluminate alkalescence working solution B.The CO that concentration is 90v% is passed in dissolving tank solution A ₂, make CO in solution ₂gas is saturated.In retort, add water purification 500ml, temperature rises to 50 DEG C.Plastic in retort solution A, solution B stream being added sealing, gelling temperature 50 DEG C, gelation time 1.5 hours, is controlled to the pH value of rubber cement liquid about 8.0.CO is added in plastic process ₂al in the total amount of gas and alkaline working solution B ₂o ₃mol ratio is 3.0.After plastic aging 2.0 hours.Then filter, filter cake adds 500ml water purification and 11.2g molybdenum trioxide, making beating stirs, and making beating stirs, and filters, filter cake was 120 DEG C of dryings 2 hours, then extruded moulding, wet bar 130 DEG C of dryings 3 hours, 550 DEG C of roastings 3 hours, obtain final catalyst D, composition and main character are in table 1.

Embodiment 5

According to the method for embodiment 1, by the constituent content proportioning of the catalyst E in table 1, add 800mL water in dissolving tank after, add nickel chloride, ammonium metatungstate and phosphorylated ligand relieving haperacidity sex work solution A, in dissolving tank solution A, pass into the CO that concentration is 90v% ₂, make CO in water ₂gas is saturated.In airtight retort, add sodium metaaluminate prepare alkaline working solution B, solution A is added in solution B reaction plastic in retort, gelling temperature 60 DEG C, gelation time 2 hours, at the end of the pH value of plastic slurries be 7.8.CO is added in plastic process ₂al in the total amount of gas and alkaline working solution B ₂o ₃mol ratio is 5.0.After plastic aging 2.5 hours.Then filter, filter cake adds 500ml water purification and 13.3g molybdenum trioxide, making beating stirs, and filter, filter cake was 80 DEG C of dryings 5 hours, then extruded moulding, wash 3 times with water purification, wet bar 120 DEG C of dryings 5 hours, 500 DEG C of roastings 4 hours, obtain final catalyst E, composition and main character are in table 1.

Comparative example 1

By method for preparing catalyst disclosed in CN1951558A, preparation forms identical reference agent F with the catalyst of embodiment 4.

In dissolving tank, add 1000mL water, then add nickel chloride 56g, ammonium metatungstate 47g and dissolve, then to add solubility be 10.9g/cm ^-3liquor alumini chloridi 450 milliliters and concentration are phosphoric acid 7.5 grams of preparating acid sex work solution A of 85wt%, and preparating acid sex work solution A, the pH value of solution A is 1.8.In retort, add 350mL water, temperature rises to 70 DEG C.When stirring, by solution A and 18% ammoniacal liquor and stream adds plastic in retort, gelling temperature 60 DEG C, gelation time 0.5 hour, the pH value of plastic slurry is 8.5.After cemented into bundles aging 1 hour.Then filter, filter cake adds 600ml water purification and 11.2g molybdenum trioxide, making beating stirs, and filter, filter cake was 80 DEG C of dryings 5 hours, then extruded moulding, wash 3 times with water purification, wet bar 120 DEG C of dryings 5 hours, 500 DEG C of roastings 4 hours, obtain final catalyst F, composition and main character are in table 1.

Comparative example 2

By method for preparing catalyst disclosed in CN101172261A, preparation forms identical reference agent G with the catalyst of embodiment 4.

In dissolving tank 1, add 500mL water, 56g nickel chloride, 47g ammonium metatungstate stirs and makes it dissolve, then adds the phosphoric acid 7.5 grams that concentration is 85wt%, is mixed with acid working solution A.In dissolving tank 2, add 500mL water, then add sodium metaaluminate 37g and dissolve, be mixed with alkaline working solution B.In retort, add 350mL water, temperature rises to 50 DEG C.When stirring, by solution A and solution B and stream adds plastic in retort, gelling temperature 50 DEG C, gelation time 2 hours, the pH value of plastic slurry is 7.5.Then add 11.2g molybdenum trioxide, making beating stirs, and filter, filter cake was 120 DEG C of dryings 1 hour, then extruded moulding, washs 3 times with water purification, and wet bar was 130 DEG C of dryings 3 hours, 600 DEG C of roastings 3 hours, obtain final catalyst G, composition and main character are in table 1.

Fig. 1 and Fig. 2 is respectively electronic scanner microscope (SEM) figure of D, G catalyst, because catalyst G tenor is high, catalyst microstructure is not very even, the group of having occurs with the phenomenon of block, explanation Metal Distribution is uneven, and the particulate of the microcosmic of catalyst D distributes greatly very even, does not occur the phenomenon of assembling, illustrate that there is good pore structure, and each metallic element of Ni/Mo/W is uniformly distributed in body phase method catalyst.

Embodiment 5

The present embodiment is catalyst activity evaluation experimental of the present invention, and contrasts with comparative example catalyst.Adopt A, D catalyst of the present invention and comparative example F, G catalyst, 200ml small hydrogenation device carries out comparative evaluation's test, test raw material is Maoming mixed diesel.Raw material main character is in table 2, and catalyst activity evaluation process conditions and evaluation result are in table 3.Adopt gas chromatography-atomic emission detector device (GC-AED) to detect hydrofined oil medium sulphide content type, the results are shown in Table 4.

As can be seen from catalyst preparation process, prepare metalliferous material bad adhesion in reference agent G plastic process, leaf grass cannot be shaping, have to cylinder shaping, material particles is large, intensity difference.From catalyst characterization result, adopt catalyst prepared by the inventive method, catalyst granules is even, has Large ratio surface sum pore volume, rational pore size distribution.Can find out that catalyst of the present invention demonstrates high hydrogenation activity when removing 4,6-DMDBT class large molecular sulfur compound from evaluation test result.Catalyst prepared by the inventive method especially shows more obvious removal effect to having sterically hindered sulfide, there is excellent hydrogenation and desulphurizing ability, can be used in hydrodesulfurization reaction, be particularly useful for the ultra-deep desulfurization reaction of production super clean diesel oil.

Table 1 catalyst composition and character

Catalyst is numbered	A	B	C	D	E	F	G
								Catalyst forms	?	?	?	?	?	?	?
NiO，wt%	18	16	16	19	18	19	19
								WO 3，wt%	40	38	38	40	37	40	40
MoO 3，wt%	12	12	10	11	13	11	11
								Al 2O 3，wt%	Surplus	Surplus	Surplus	Surplus	Surplus	Surplus	Surplus
Other/wt%	Nothing	Nothing	ZrO 2/2.0	P/2.0	TiO 2/3.0	P/2.0	P/2.0
								Shape	Clover	Clover	Clover	Clover	Clover	Clover	Cylinder
Catalyst property	?	?	?	?	?	?	?
								Specific area, m 2/g	241	243	252	248	259	151	142
Pore volume, mL/g	0.288	0.281	0.271	0.278	0.301	0.198	0.158
								Intensity, N/mm	17.2	19.9	20.5	18.9	19.1	12.7	9.8
Pore size distribution, %	?	?	?	?	?	?	?
								＜4nm	17.88	17.38	17.15	18.28	17.98	68.27	18.26
4nm~15nm	71.06	71.48	72.50	70.51	70.65	29.87	70.56
								＞15nm	11.06	11.14	10.35	11.21	10.37	1.86	11.18

Table 2 feedstock oil main character

Project	Analysis result
		Density (20 DEG C), g/cm 3	0.8614
Boiling range scope, DEG C	178-373
		S，μg/g	12200
N，μg/g	288
		Cetane number	46.5

Table 3 catalyst HDS reaction process condition and evaluation result

Catalyst	A	D	F	G
					Hydrogen dividing potential drop, MPa	6.4	6.4	6.4	6.4
Reaction temperature, DEG C	360	360	360	360
					Volume space velocity during liquid, h -1	2.0	2.0	2.0	2.0
Hydrogen to oil volume ratio	500	500	500	500
					Generate oil	?	?	?	?
Density (20 DEG C), g/cm 3	0.8295	0.8319	0.8458	0.8517
					Boiling range scope, DEG C	165-363	166-364	167-369	168-371
S，μg/g	8.9	7.6	68	83
					N，μg/g	1.0	1.0	3.5	3.3
Cetane number	53.4	52.5	49.5	49.7

Claims (14)

1. a preparation method for hydrotreatment catalyst composition, comprising:

(1), coprecipitation generates NixWyOz composite oxides precursor and Al ₂o ₃the mixture of precursor;

(2), by the mixture of step (1) gained and MoO ₃making beating mixing, filtration, drying;

(3), step (2) gained material obtains final catalyst through shaping, dry and roasting;

Wherein, step (1) process is as follows: preparation, containing Ni, W component saline mixed solution A, passes into CO in solution A ₂gas; Preparation containing the alkaline solution B of aluminium, by solution B with pass into CO ₂the solution A reaction plastic of gas, at the end of reaction, the pH value controlling slurries in retort is 7.0 ~ 9.0, makes composite oxides Ni _xw _yo _zprecursor and Al ₂o ₃the mixture of precursor, wherein adds CO ₂al in the total amount of gas and alkaline solution B ₂o ₃mol ratio be 2 ~ 8.

2. in accordance with the method for claim 1, it is characterized in that, in solution A, pass into CO ₂gas, makes CO in solution A ₂concentration reaches capacity.

3. in accordance with the method for claim 1, it is characterized in that the middle solution B of step (1) and pass into CO ₂the solution A of gas reacts plastic, adopts and flow plastic method, tank plastic method or two kinds of methods to combine, and when wherein adopting tank plastic method, at the end of controlling plastic reaction, pH value is 7.0 ~ 9.0, and when adopting and flow plastic, in retort, the pH value of slurries is 7.0 ~ 9.0.

4. in accordance with the method for claim 1, it is characterized in that the described alkaline solution B containing aluminium is sodium aluminate solution.

5. in accordance with the method for claim 1, it is characterized in that described hydrotreatment catalyst composition, containing Mo, W, Ni tri-kinds of metal components, wherein W, Ni exist with composite oxides form: Ni _xw _yo _z, z=x+3y, Mo exist with oxide form: MoO ₃, composite oxides Ni _xw _yo _zthe ratio of middle x and y is 1:8 ~ 8:1, composite oxides Ni _xw _yo _zwith oxide M oO ₃weight ratio be 1:10 ~ 10:1, with the weight of hydrotreatment catalyst composition for benchmark, composite oxides Ni _xw _yo _zwith oxide M oO ₃gross weight content be 40% ~ 95%, alumina content is 5% ~ 60%.

6. in accordance with the method for claim 1, it is characterized in that described hydrotreatment catalyst composition, containing Mo, W, Ni tri-kinds of metal components, wherein W, Ni exist with composite oxides form: Ni _xw _yo _z, z=x+3y, Mo exist with oxide form: MoO ₃, composite oxides Ni _xw _yo _zthe ratio of middle x and y is 1:4 ~ 4:1, composite oxides Ni _xw _yo _zwith oxide M oO ₃weight ratio be 1:5 ~ 5:1, with the weight of hydrotreatment catalyst composition for benchmark, composite oxides Ni _xw _yo _zwith oxide M oO ₃gross weight content be 45% ~ 85%, alumina content is 15% ~ 55%.

7. in accordance with the method for claim 1, it is characterized in that adding required catalyst promoter in a step in step (1) ~ (3) or a few step, auxiliary agent comprises one or more in P, F, Ti, Si, B, Zr; The weight content of described auxiliary agent in carbon monoxide-olefin polymeric is 1% ~ 20%.

8. in accordance with the method for claim 1, it is characterized in that in step (1), preparation is containing the saline mixed solution of active metal Ni, W component, and wherein Ni is that 20 ~ 80g/L, W are with WO in the weight concentration of NiO ₃the weight concentration of meter is 50 ~ 120g/L; Be one or more in nickelous sulfate, nickel nitrate, basic nickel carbonate, nickel chloride containing nickel salt, tungsten salt is one or more in sodium tungstate, ethyl ammonium metatungstate, ammonium metatungstate; Preparation is 20 ~ 80gAl containing the weight concentration of the alkaline solution of aluminium ₂o ₃/ L.

9. in accordance with the method for claim 1, it is characterized in that the CO passed in step (1) retort ₂the volumetric concentration of gas is 70v% ~ 99v%.

10. in accordance with the method for claim 1, it is characterized in that ageing time is 1.0 ~ 5.0 hours through aging after step (1) plastic.

11. in accordance with the method for claim 1, it is characterized in that step (2) filters the filter cake that obtains through washing or without carrying out washing treatment, then dehydrate under 50 ~ 150 DEG C of conditions, 0.5 ~ 24.0 hour drying time, obtain Ni _xw _yo _zcomposite oxides precursor, MoO ₃with Al ₂o ₃the mixture of precursor.

12. in accordance with the method for claim 1, and it is characterized in that the gelling temperature described in step (1) is 30 ~ 80 DEG C, gelation time is 0.5 ~ 5.0 hour.

13. in accordance with the method for claim 1, it is characterized in that the drying condition described in step (3) is as follows: 50 ~ 200 DEG C of dryings 1 ~ 48 hour, described roasting condition was as follows: 450 ~ 600 DEG C of roastings 1 ~ 24 hour.

14. in accordance with the method for claim 1, it is characterized in that the preparation process of described hydrotreatment catalyst composition is carried out in airtight retort.