CN106140248A - A kind of preparation method of diesel oil hydrogenation modification catalyst carrier - Google Patents
A kind of preparation method of diesel oil hydrogenation modification catalyst carrier Download PDFInfo
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Abstract
The invention discloses the preparation method of a kind of diesel oil hydrogenation modification catalyst carrier.The method includes: beta-molecular sieve, macroporous aluminium oxide and binding agent is mixed, molding, drying and roasting, makes carrier；Wherein beta-molecular sieve is to use specific acid-base precipitation method to prepare amorphous silica-alumina predecessor, is subsequently adding water, silicon source and template, obtains silica-alumina gel；Through two step dynamic crystallizations, then process through ammonium salt exchange and Template removal, prepare beta-molecular sieve.The catalyst for hydro-upgrading using this carrier to prepare has the features such as diesel product yield height and good product quality.
Description
Technical field
The present invention relates to the preparation method of a kind of diesel oil hydrogenation modification catalyst carrier, more specifically one can be with poor ignition quality fuel as raw material, and production has the preparation method of the diesel oil hydrogenation modification catalyst carrier containing beta-molecular sieve of the diesel oil of the feature such as high cetane number, low condensation point, relatively low-density.
Background technology
Along with crude oil heaviness, the aggravation of in poor quality degree, secondary processing diesel oil fraction especially catalytic cracking diesel oil degradation, on the other hand, for improving yield of light oil, the each refiner in countries in the world improves the working depth of catalytic cracking process one after another, and then causes the quality of catalytic cracking diesel oil to be deteriorated further.Along with increasingly strict, the continuous upgrading of diesel quality standard of environmental requirement, especially discharge standard Central Europe IV, Europe V standard proposes more strict requirements to indexs such as the sulfur in diesel oil and arene content, Cetane number, density, T95.It addition, the people of extremely frigid zones or life in winter regard the low temperature flowability of diesel product is heavier, only low freezing point diesel fuel product can meet actually used demand.Winter, north cold area needed a large amount of low-coagulation diesel oils, and low temperature flow (condensation point, cold filter plugging point, the pour point etc.) index of diesel oil seems even more important.
At present, the production technology of cleaning diesel product mainly has the technology such as hydrofinishing and MHUG.Hydrofinishing can effectively reduce the sulfur content of modification diesel oil, but effect is general in terms of improving Cetane number and reducing T95 temperature.MHUG is suitably to be cracked by diesel oil under the conditions of middle pressure, changes catalytic cracking diesel oil hydro carbons composition structure, reaches to improve the purpose of the cleaning diesel product of diesel product quality, the satisfied harsh diesel oil standard of production.In current, the Cracking Component employed in pressure diesel modifying catalyst is mainly modified Y type molecular sieve, owing to Y type molecular sieve has the supercage structure of twelve-ring so that the shortcomings such as amplitude is little, the recovery of T95 point is little, condensation point is high and density is big that the yield dry large-minded, diesel product of existing diesel modifying catalyst is low, Cetane number improves.Such as, CN1184843A and CN101463271A.CN1184843A discloses a kind of catalyst for hydrocracking diesel oil, this catalyst consist of aluminium oxide 40 ~ 80wt%, amorphous silica-alumina 0 ~ 20wt%, molecular sieve 5 ~ 30wt%, described molecular sieve is pore volume 0.4 ~ 0.52mL/g, specific surface area 750 ~ 900m2/ g, lattice constant 2.420 ~ 2.500nm, silica alumina ratio is the Y type molecular sieve of 7 ~ 15.CN101463271A discloses a kind of catalyst for hydro-upgrading of inferior diesel and preparation method thereof, mainly use predecessor and Y type molecular sieve mixing, molding and the roasting of silica-alumina, aluminium oxide and/or aluminium oxide, introduce the hydrogenation metal of effective dose afterwards at molding species.Above-mentioned catalyst has higher desulfurization and a denitrification activity, but the shortcoming such as the amplitude that the yield of diesel product is low, diesel-fuel cetane number improves is little, condensation point is high and density is big.
Relative to Y type molecular sieve, beta-molecular sieve has three-dimensional twelve-ring pore structure, but not supercage structure as Y type molecular sieve, it is mainly characterized by double 6 ring unit bug hole structures of two 4 rings and four 5 rings, main channel diameter is at 0.56-0.75nm, the duct feature of beta-molecular sieve makes it in cracking reaction, the fracture of chain hydrocarbon-selective be had well effect, and there is the strongest isomery performance, can be used for producing low condensation point oil distillate as cracking component, be industrially widely used.
US4847055 discloses the method for the synthesis beta-molecular sieve of a kind of improvement, wherein uses a kind of special silicon source, with TEABr as template, prepares beta-molecular sieve under conditions of crystal seed exists.This silicon source is to be added precipitant under certain condition by soluble silicon solution to prepare.The large usage quantity of the method template, and easily produce modenite and ZSM-5 stray crystal.Only as (TEA)2O/SiO2> 0.14, i.e. TEA+/SiO2> 0.28 time, the growing amount of stray crystal could be reduced.
Above-mentioned water heat transfer β zeolite needs a large amount of expensive organic formwork agent tetraethyl ammonium hydroxide, the cost major part of beta-molecular sieve synthesis to come from template, typically constitute from about 70%.Reduce template consumption, thus reduce β zeolite synthesis cost, always the focus of this area research.
Furthermore, the organic formwork agent being blocked in zeolite cavity removing must be fallen just can make it have catalysis activity before using as catalyst by beta-molecular sieve.The method of conventional removing organic formwork agent is high-temperature roasting, and owing to high-temperature roasting will destroy the structure of beta-molecular sieve so that it is degree of crystallinity declines, heat stability and hydrothermal stability are deteriorated, and consumption of template agent is the biggest, and this destructiveness is the most serious.And when using the beta-molecular sieve adding a small amount of template synthesizing high-silicon aluminum ratio, the degree of crystallinity of product can be the lowest, heat stability and hydrothermal stability are poor.
CN1351959A relates to the synthetic method of a kind of molecular sieve.First Al is pressed2O3: (30-150) SiO2: (5-20) (TEA)2O:(1-8.5) Na2O:(650-1200) H2The mol ratio of O prepares Alusil A, by Al2O3: (20-80) SiO2: (5-15) Na2O:(350-1000) H2The mol ratio of O prepares Alusil B, then Alusil A and Alusil B is pressed the weight ratio mixing of 1:10, proceed to after stirring in autoclave pressure, after sealing at a temperature of 100-200 DEG C, stir crystallization 15-150 hour under static or 10-150rpm rotating speed, end product through sucking filtration, wash and be dried to obtain beta-molecular sieve.Although the consumption of organic formwork can be reduced to TEAOH/SiO by this synthetic method2=0.05, but beta-molecular sieve silica alumina ratio prepared by the method is relatively low, and also the characteristic peak of beta-molecular sieve has a small amount of miscellaneous peak, has stray crystal to generate.
CN 1198404A proposes a kind of method synthesizing beta-molecular sieve, uses the composite mould plate agent formed in the basic conditions by halogenide, tetraethyl ammonium hydroxide and the fluoride of tetraethyl ammonium, makes silicon source, aluminum source and crystal seed reaction crystallization produce beta-molecular sieve.Although the method reduces template consumption, adding the productivity of beta-molecular sieve, however it is necessary that addition composite mould plate agent and crystal seed, and after silica alumina ratio is more than 30, degree of crystallinity is relatively low, heat stability and hydrothermal stability are poor.
Summary of the invention
For weak point of the prior art, the invention provides the preparation method of the good diesel oil hydrogenation modification catalyst carrier of a kind of catalytic performance.This catalyst for hydro-upgrading carrier use a kind of high silica alumina ratio, high-crystallinity, bigger serface, good stability type molecular sieve as acidic components, carrier of the present invention the catalyst for hydro-upgrading prepared has that diesel product yield is high and the feature such as good product quality.
The preparation method of diesel oil hydrogenation modification catalyst carrier of the present invention, including: beta-molecular sieve, macroporous aluminium oxide and binding agent are mixed, molding, drying and roasting, make carrier；On the basis of the weight of carrier, carrier composition includes: the content of beta-molecular sieve is 5～30wt%, and the content of macroporous aluminium oxide is 20～65wt%, and the content of binding agent is 15～50wt%；Wherein said beta-molecular sieve, including following preparation process:
(1), using acid-base precipitation method to prepare amorphous silica-alumina predecessor, described amorphous silica-alumina predecessor is on the basis of the gross weight of silicon dioxide and aluminium oxide, and the content that silicon is counted with silicon dioxide is as 40wt%～75wt%, preferably 55wt%～70wt%；Its preparation process includes acid-base neutralization plastic, aging, wherein silicon introduce reaction system method be in aluminum contained compound and plastic before and/or plastic during introducing portion silicon-containing compound, remainder silicon-containing compound be in aluminum contained compound and plastic after and introduce before ageing；
(2), by Al2O3: SiO2: Na2O:H2O=1:(62 ~ 130): (0.5～3.0): (100～500), TEAOH/SiO2It is total molar ratio of 0.010 ~ 0.095, preferably SiO2/Al2O3Be 70 ~ 110, TEAOH/SiO2=0.020 ~ 0.080, under conditions of 0～40 DEG C of quick stirring, in the amorphous silica-alumina predecessor of step (1) gained, add water, silicon source and template, and control ph is 9.5 ~ 12.0, stirs, obtaining silica-alumina gel, TEA is the quaternary amine alkali cation in template；
(3), the silica-alumina gel of step (2) gained through two step dynamic crystallizations, then through filtering, washing, prepare Na beta molecular sieve.
(4), described Na beta molecular sieve carries out ammonium salt exchange and Template removal processes, and prepares beta-molecular sieve.
Preferably, the preparation method of the amorphous silica-alumina predecessor of step (1) uses conventional acid-base precipitation method, including acid-base neutralization plastic, aging, and wherein acid-base neutralization plastic process is acid material and the neutralization course of reaction of alkaline material.
Preferably, neutralization plastic process in the way of using acid material or the continuous acid-base titration of alkaline material, or can use acid material and alkaline material and flow the mode of neutralization.
Preferably, described in aluminum contained compound with precipitant and before plastic and/or during plastic the mode of introducing portion silicon-containing compound be: part silicon-containing compound carries out premixing with described aluminum contained compound and/or precipitant, silicon-containing compound and can also be individually added in reaction system during plastic in aluminum contained compound, it is also possible to be the combination of said method.
When carrying out premixing, first can mix with acid material or alkaline material according to the character of different silicon-containing compounds, then (when such as using sodium silicate containing silicon materials, sodium silicate can mix with alkaline material to carry out acid-base neutralization plastic；When using Ludox containing silicon materials, add in acid aluminiferous material).
The mode that silicon-containing compound is individually added in aluminum contained compound and during plastic reaction system is: described aluminum contained compound and precipitant first mix, then it is individually added into silicon-containing compound, or described part silicon-containing compound, described aluminum contained compound and precipitant are separately added in reactor simultaneously；Or described part silicon-containing compound and aluminum contained compound are added separately in described precipitant simultaneously；Or described part silicon-containing compound and precipitant are added separately in described aluminum contained compound simultaneously.The mode being individually added into reaction system is not affected by the character containing silicon materials, and silicon-containing compound can be directly added into.
Preferably, in step (1), the silicon-containing compound and after plastic and introduced before ageing in described aluminum contained compound accounts for the 5wt% ~ 85wt% in terms of silicon dioxide of the silicon in amorphous silica-alumina predecessor, preferably 30wt% ~ 70wt% in terms of silicon dioxide.
Preferably, described aluminum contained compound is selected from Al2(SO4)3、AlCl3、Al(NO3)3One or more in solution, the concentration of described aluminum contained compound solution is 30～150g A12O3/L；One or more in sodium hydroxide solution, ammonia, sodium carbonate liquor, sodium bicarbonate solution, sodium aluminate solution of precipitant.
Preferably, described aluminum contained compound is sodium aluminate solution, and the concentration of described sodium aluminate solution is 40～100 g A12O3/ L, described acidic precipitation agent is nitric acid.
Described silicon-containing compound can be one or more in waterglass, Ludox and organo-silicon compound etc., and described organo-silicon compound are preferably one or more in silanol, silicon ether and siloxanes, with SiO2Quality meter, the concentration of described silicon-containing compound is 40～200 g SiO2/L。
In step (2), described silicon source uses silicon source for conventional during preparing beta molecular sieve, and described silicon source is one or more in White Carbon black, silica gel, Ludox, waterglass.Described template is preferably tetraethyl ammonium hydroxide.
In described step (1), the condition of described plastic is: temperature is 20～85 DEG C, and pH value is 7.0～10.0, is preferably, and temperature is 40～80 DEG C, and pH value is 7.5～9.0；
Described aging condition is: temperature is 20～85 DEG C, and pH is 7.0～10.0, time 0.2～8.0 hours, is preferably, and temperature is 40～80 DEG C, and pH is 7.0～9.5, and the time is 0.5～5.0 hour.
In step (2), generating the reaction temperature 0 of described silica-alumina gel～40 DEG C, pH value is 9.5～12.0, is preferably, and the reaction temperature generating described silica-alumina gel is 10～30 DEG C, and pH value is 10～11.
In described step (3), the silica-alumina gel of step (2) gained includes through the concrete steps of two step dynamic crystallizations: the condition of first step dynamic crystallization is: carry out crystallization under agitation, and temperature is 50～90 DEG C, and the time is 0.5～18 hour；The condition of second step dynamic crystallization is: carry out crystallization under agitation, and temperature is 100～200 DEG C, and the time is 40～120 hours.
In described step (3), the condition of described first step dynamic crystallization is: carry out crystallization under agitation, and temperature is 60～80 DEG C, and the time is 1～10 hour；The condition of described second step dynamic crystallization is: carry out crystallization under agitation, and temperature is 120～170 DEG C, and the time is 50～100 hours.
In described step (3), in the silica-alumina gel of step (2) gained through two step dynamic crystallizations, then through filtering, after washing, through being dried or moist can obtain Na beta molecular sieve.
Preferably, in step (4), ammonium salt exchange uses conventional method to carry out, as one or many ammonium salt exchanges, and Na in the beta-molecular sieve after ammonium salt exchange2O weight content is less than 0.3%；Can be through washing and the step being dried after ammonium salt exchange, the condition being wherein dried is as follows: be dried 3～6 hours at 80 DEG C ~ 150 DEG C.
Preferably, in step (4), described Template removal processes and uses aerobic high-temperature process, and treatment temperature is 400～800 DEG C, and the process time is 5～20 hours, is preferably, and treatment temperature is 500～700 DEG C, and the process time is 10～15 hours.
In catalyst for hydro-upgrading carrier of the present invention, the character of beta-molecular sieve used is as follows: SiO2/Al2O3Mol ratio is 60～120, and specific surface area is 505～850m2/ g, pore volume is 0.35～0.60mL/g, and relative crystallinity is 100%～135%；This beta-molecular sieve relative crystallinity after water vapour hydrothermal treatment consists is more than 95%.
Beta-molecular sieve preferred property used is, SiO2/Al2O3Mol ratio is 65～100, and specific surface area is 550～800m2/ g, pore volume is 0.40～0.60mL/g, and relative crystallinity is 110%～130%, and this beta-molecular sieve relative crystallinity after water vapour hydrothermal treatment consists is 95%～125%.
Beta-molecular sieve character used is more preferably: SiO2/Al2O3Mol ratio is 65～100, and specific surface area is 600～750 m2/ g, pore volume 0.45～0.55mL/g, relative crystallinity is 115%～130%；This beta-molecular sieve relative crystallinity after water vapour hydrothermal treatment consists is 110%～125%.
In the present invention, this beta-molecular sieve was as follows through the condition of water vapour hydrothermal treatment consists: through 750 DEG C of water vapour hydrothermal treatment consists 2 hours.
In the preparation method of catalyst for hydro-upgrading carrier of the present invention, it is 0.3～0.5 mL/g that adhesive therefor is preferably the pore volume of the little porous aluminum oxide used by little porous aluminum oxide, and specific surface area is 200～400m2/g。
In catalyst carrier of the present invention, the pore volume of macroporous aluminium oxide used is 0.7 ~ 1.0 mL/g, specific surface area 200 ~ 500 m2/g。
Catalyst carrier of the present invention can be shaped according to actual needs, and shape can be cylindrical bars, Herba Trifolii Pratentis etc..In catalyst carrier forming process, it is also possible to adding shaping assistant, such as peptization acid, extrusion aid etc., peptizer typically can use mineral acid and/or organic acid, extrusion aid such as sesbania powder.Catalyst carrier of the present invention used conventional method to be dried and roasting, specific as follows: be dried 3～10 hours at a temperature of 80～150 DEG C, 400～800 DEG C of roastings 3～12 hours.
When catalyst carrier of the present invention is used for preparing hydrocracking catalyst, carrying method conventional in prior art can be used, preferably infusion process, can be saturated leaching, excess leaching or complexation leaching, i.e. with the solution impregnated catalyst carrier containing required active component, carrier after dipping, through being dried, after roasting, prepares final hydrocracking catalyst.
Diesel oil hydrogenation modification catalyst support properties of the present invention is as follows: specific surface area is 400～600 m2/ g, pore volume is 0.50～1.0 mL/g.
Part silicon-containing compound, in the preparation process of beta-molecular sieve, is first added in reaction system before plastic and/or during plastic by the present invention, forms stable colloidal state and sial integrated structure.Owing to this colloid surface has a lot of hydroxyl structures, can be combined with the remainder silicon-containing compound added below well, so that amorphous silica-alumina predecessor has more stable structure.Afterwards, amorphous silica-alumina predecessor, template are mixed and made into silica-alumina gel with another part silicon source etc., so can form more nucleus in synthetic system, it is evenly dispersed in synthetic system, there is good crystallization guide effect, again through two step dynamic crystallizations, easily form complete framing structure, the beta-molecular sieve that degree of crystallinity is high.The inventive method not only can reduce the usage amount of organic formwork agent, it is also possible to synthesizes the beta-molecular sieve of high-crystallinity, high silica alumina ratio, and has more preferable heat stability and hydrothermal stability, and the beta-molecular sieve purity of the present invention is high, does not has stray crystal.And, the beta-molecular sieve of the present invention is through the exchange of simple ammonium salt and Template removal by Na beta molecular sieve, just can obtain, it is not necessary to carry out the dual-spectrum process such as dealuminzation or dealumination complement silicon again.
By the catalyst prepared by diesel oil hydrogenation modification catalyst carrier of the present invention when poor ignition quality fuel modifies, particularly there is the highest catalysis activity and diesel yield when middle press strip part (4 ~ 12MPa) processes poor ignition quality fuel, and it is big that the condensation point of diesel oil distillate reduces amplitude, improve modification diesel-fuel cetane number by a relatively large margin, the density of diesel product is the most effectively reduced, and can meet refinery and increase operating flexibility, increases device disposal ability, raises productivity and improves the quality the needs of diesel oil further.
Detailed description of the invention
In order to the present invention is better described, further illustrate the present invention below in conjunction with embodiment and comparative example.But the scope of the present invention is not limited solely to the scope of these embodiments.The present invention analyzes method: specific surface area, pore volume use low temperature liquid nitrogen physisorphtion, and relative crystallinity uses x-ray diffraction method, and silica alumina ratio uses chemical method.In the present invention, wt% is mass fraction.
Embodiment 1
(1) preparation of amorphous silica-alumina predecessor
It is 80g A1 that Solid aluminum sulfate is configured to 100mL concentration2O3/ L aluminum sulfate working solution (a).Strong aqua ammonia is added appropriate distilled water diluting and becomes about 10wt% weak ammonia (b).Take with SiO2The sodium silicate solution of quality meter 28wt%, then to be diluted to 80mL concentration be 150g SiO2/ L sodium silicate working solution (c).Take the steel retort of 5 liters, after retort adding 0.2 liter of distilled water and being heated with stirring to 70 DEG C, open the valve having (a) and (b) and (c) container respectively simultaneously, control the flow of (a) and (c) so that neutralizing the response time at 40 minutes, and the flow adjusting rapidly (b) makes the pH value of system be maintained at 7～8, and control the temperature of system at about 60 DEG C.After reacting aluminum sulfate completes, stopping adding (b), the addition of (c) is 40mL, after the silicon-aluminum sol generated stablizes 20 minutes, continuously add (c) 40mL, add in 10 minutes, start the ageing process of system, keep pH value 8.0, temperature 60 C, aging 30 minutes, obtains amorphous silica-alumina predecessor, amorphous silica-alumina predecessor is on the basis of the wgt dry basis by total of silicon dioxide and aluminium oxide, and the content counted with silicon dioxide is as 60wt%.
(2) preparation of gel
According to Al2O3: SiO2: Na2O:H2O=1:80: 1.6: 240, TEAOH/SiO2Each material is mixed by total molar ratio of=0.075, adding water, sodium silicate solution and tetraethyl ammonium hydroxide in the amorphous silica-alumina predecessor of step (1) gained, and control ph is 11, reaction temperature is 25 DEG C, uniform stirring 30 minutes, obtains silica-alumina gel.
(3) crystallization
Silica-alumina gel obtained by step (2) is poured in stainless steel cauldron, stirs crystallization 5 hours at 80 DEG C, then heat to 150 DEG C, stirring crystallization 30 hours, then filters, and washs and is dried at 120 DEG C to neutrality, obtain Na beta-molecular sieve product N β-1, record relative crystallinity；N β-1, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；N β-1 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete N β-1 character is shown in Table 1.
(4) ammonium salt exchange and Template removal
Adding appropriate water purification in Na beta-molecular sieve N β-1, and add a certain amount of ammonium nitrate, making liquid-solid ratio (weight) is 10:1, the concentration of ammonium nitrate is 2mol/L, stirring, is warmed up to 95～100 DEG C, and constant temperature stirs 2 hours, then filter, filter cake secondary again carries out ammonium salt exchange, and the condition of exchange is identical with first time, till finally washing molecule is sieved to pH value neutrality, put in dry zone and be dried, be dried 8 hours at 100～120 DEG C.Taking dried beta-molecular sieve to carry out deviating from template process, use open kiln to process, 570 DEG C of constant temperature process 15 hours, make beta-molecular sieve S β-1, XRD determining S β-1 relative crystallinity；S β-1 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
Embodiment 2
(1) preparation of amorphous silica-alumina predecessor
It is 100g A1 that solid aluminum chloride is configured to 100mL concentration2O3
/ L aluminum chloride working solution (a).Strong aqua ammonia is added appropriate distilled water diluting and becomes about 10wt% weak ammonia (b).Take with SiO2The sodium silicate solution of quality meter 28wt%, then to be diluted to 100mL concentration be 100g SiO2/ L sodium silicate working solution (c).Take the steel retort of 2 liters, after adding 0.3 liter of distilled water in retort and being heated with stirring to 70 DEG C, open the valve having (a) and (b) and (c) container respectively simultaneously, control the flow of (a) and (c) so that neutralizing the response time at 40 minutes, and the flow adjusting rapidly (b) makes the pH value of system be maintained at 7～8, and control the temperature of system at about 60 DEG C.After aluminium reaction completes, stopping adding (b), the addition of (c) is 60mL, after the silicon-aluminum sol generated stablizes 20 minutes, continuously add (c) 40mL, add in 10 minutes, start the ageing process of system, keep pH value 8.0, temperature 60 C, aging 30 minutes, obtains amorphous silica-alumina predecessor, amorphous silica-alumina predecessor is on the basis of the wgt dry basis by total of silicon dioxide and aluminium oxide, and the content counted with silicon dioxide is as 50wt%.
(2) preparation of gel
According to Al2O3: SiO2: Na2O:H2O=1:90: 1.8: 260, TEAOH/SiO2Each material is mixed by total molar ratio of=0.062, adding water, sodium silicate solution and tetraethyl ammonium hydroxide in the amorphous silica-alumina predecessor of step (1) gained, and control ph is 11, reaction temperature is 25 DEG C, uniform stirring 30 minutes, obtains silica-alumina gel.
(3) crystallization
Silica-alumina gel obtained by step (2) is poured in stainless steel cauldron, stirs crystallization 5 hours at 90 DEG C, then heat to 160 DEG C, stirring crystallization 30 hours, then filters, and washs and is dried at 120 DEG C to neutrality, obtain Na beta-molecular sieve product N β-2, record relative crystallinity；N β-2, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；N β-2 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete N β-2 character is shown in Table 1.
(4) ammonium salt exchange and Template removal
Adding appropriate water purification in Na beta-molecular sieve N β-2, and add a certain amount of ammonium nitrate, making liquid-solid ratio (weight) is 10:1, the concentration of ammonium nitrate is 2mol/L, stirring, is warmed up to 95～100 DEG C, and constant temperature stirs 2 hours, then filter, filter cake secondary again carries out ammonium salt exchange, and the condition of exchange is identical with first time, till finally washing molecule is sieved to pH value neutrality, put in dry zone and be dried, be dried 8 hours at 100～120 DEG C.Taking dried beta-molecular sieve to carry out deviating from template process, use open kiln to process, 570 DEG C of constant temperature process 15 hours, make beta-molecular sieve S β-2, XRD determining S β-2 relative crystallinity；S β-2 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
Embodiment 3
(1) preparation of amorphous silica-alumina predecessor.
It is 100g A1 that solid aluminum chloride is configured to 120mL concentration2O3 / L aluminum chloride working solution (a).Strong aqua ammonia is added appropriate distilled water diluting and becomes about 10wt% weak ammonia (b).Take with SiO2The sodium silicate solution of quality meter 28wt%, then to be diluted to 100mL concentration be 80g SiO2/ L sodium silicate working solution (c).nullTake the steel retort of one 2 liters，0.3 liter of distilled water is added in retort，Open the valve having (a) container，(a) joined in retort and stir，Then the valve having (c) container is opened，About 30 minutes by 40ml(c) join in retort，After being heated to 70 DEG C，Open the valve having (b) container，Control the flow of (b) so that neutralizing the response time at 40 minutes，When system pH reaches about 7 ~ 8，Close valve，After the silicon-aluminum sol generated stablizes 20 minutes，Continuously add (c) 50ml，Add in 10 minutes，The ageing process of beginning system，Keep pH value 8.5，Temperature 60 C，Aging 30 minutes，Obtain amorphous silica-alumina predecessor，Amorphous silica-alumina predecessor is on the basis of the wgt dry basis by total of silicon dioxide and aluminium oxide，The content counted with silicon dioxide is as 40wt%.
(2) preparation method of gel is the most identical with embodiment 1.Difference is: according to Al2O3: SiO2: Na2O:H2O=1:70: 1.8: 260, TEAOH/SiO2Each material is mixed by total molar ratio of=0.064.
(3) crystallization is with embodiment 1, obtains Na beta-molecular sieve product N β-3, records relative crystallinity；N β-3, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；N β-3 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete N β-3 character is shown in Table 1.
(4) ammonium salt exchange and Template removal
Na beta-molecular sieve N β-3, with embodiment 1, is made beta-molecular sieve S β-3, XRD determining S β-3 relative crystallinity by the method for ammonium salt exchange and Template removal；S β-3 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
Embodiment 4
By 20 grams of S β-1 molecular sieves, 105 grams of macroporous aluminium oxides (pore volume 0.9mLg, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides of binding agent, mixed grind in chaser is put into dust technology (wherein nitric acid is 0.25 with the mol ratio of little porous aluminum oxide), add water, it is rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, obtaining carrier TCAT-1, character is shown in Table 3.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CAT-1, carrier and corresponding catalyst character and are shown in Table 3.
Embodiment 5
By 40 grams of S β-2 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides of binding agent, put into mixed grind in chaser with dust technology (wherein the mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, carrier TCAT-2 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CAT-2, carrier and corresponding catalyst character and are shown in Table 3.
Embodiment 6
By 40 grams of S β-3 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides of binding agent, put into mixed grind in chaser with dust technology (wherein the mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, carrier TCAT-3 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CAT-3, carrier and corresponding catalyst character and are shown in Table 3.
Comparative example 1 (with reference to CN1351959A)
By 20.5g White Carbon black, 2mL sodium aluminate solution, 59g tetraethyl ammonium hydroxide and 0.9g sodium hydroxide, mix under room temperature and mechanical agitation, and continue stirring to raw material mix homogeneously: mixture is proceeded in autoclave pressure, after static state is aged 5 hours at a temperature of 130 DEG C after sealing, takes out and quick cooling pressure still, obtain Alusil A.120g Ludox, 6.3mL sodium metaaluminate, 6g sodium hydroxide and 17mL distilled water are mixed under room temperature and mechanical agitation, and stirs to raw material mix homogeneously, obtain Alusil B.5g Alusil A and 50g Alusil B is mixed under room temperature and mechanical agitation, and stirs and proceed in autoclave pressure to raw material mix homogeneously, after sealing at a temperature of 130 DEG C, to stir crystallization 48 hours under 60rpm rotating speed, take out and quick cooling pressure still.Product, through sucking filtration, washing, washs and is dried at 120 DEG C to neutrality, obtain Na beta-molecular sieve products C N β-1, and characterization result shows, product is the characteristic peak possessing beta-molecular sieve, but has a small amount of miscellaneous peak, i.e. has a small amount of stray crystal.And record the relative crystallinity of CN β-1；CN β-1, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；CN β-1 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete CN β-1 character is shown in Table 1.
Carry out ammonium salt exchange and Template removal according to the method for embodiment 1, Na beta-molecular sieve CN β-1 is made H beta molecular sieve products C S β-1, XRD determining CS β-1 relative crystallinity；CS β-1 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
By 40 grams of CS β-1 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides, put into mixed grind in chaser with dust technology (mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, carrier TCCAT-1 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CCAT-1, carrier and corresponding catalyst character and are shown in Table 3.
Comparative example 2(is with reference to CN1198404A)
16g tetraethylammonium bromide and 1.6g sodium fluoride D are dissolved in 30g deionized water, it is sequentially added under stirring and is dissolved in 20g deionized water gained solution, 53.7g Ludox and 0.72g crystal seed by 1.67g sodium aluminate B, continue stirring 60 minutes, proceed in stainless steel cauldron, crystallization 4 days at 160 DEG C.Then filter, wash, be dried to obtain Na beta-molecular sieve products C N β-2, record the relative crystallinity of CN β-2；CN β-2, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；CN β-2 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete CN β-2 character is shown in Table 1.
Carry out ammonium salt exchange and Template removal according to the method for embodiment 1, Na beta-molecular sieve CN β-2 is made H beta molecular sieve products C S β-2, XRD determining CS β-2 relative crystallinity；CS β-2 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
By 40 grams of CS β-2 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides, put into mixed grind in chaser with dust technology (mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, support C TCAT-2 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CCAT-2, carrier and corresponding catalyst character and are shown in Table 3.
Comparative example 3
(1) preparation of amorphous silica-alumina predecessor
It is 80g A1 that Solid aluminum sulfate is configured to 100mL concentration2O3/ L aluminum sulfate working solution (a).Strong aqua ammonia is added appropriate distilled water diluting and becomes about 10wt% weak ammonia (b).Take with SiO2The sodium silicate solution of quality meter 28wt%, then to be diluted to 80mL concentration be 150g SiO2/ L sodium silicate working solution (c).Take the steel retort of 5 liters, after retort adding 0.2 liter of distilled water and being heated with stirring to 70 DEG C, open the valve having (a) and (b) and (c) container respectively simultaneously, control the flow of (a) and (c) so that neutralizing the response time at 40 minutes, and the flow adjusting rapidly (b) makes the pH value of system be maintained at 7～8, and control the temperature of system at about 60 DEG C.After having reacted, stopping adding (b), the silicon-aluminum sol of generation stablizes 20 minutes.The ageing process of beginning system, keep pH value 8.0, temperature 60 C, aging 30 minutes, obtain amorphous silica-alumina predecessor, amorphous silica-alumina predecessor is on the basis of the wgt dry basis by total of silicon dioxide and aluminium oxide, and the content counted with silicon dioxide is as 60wt%.
(2) preparation of gel is with embodiment 1.
(3) crystallization is with embodiment 1, records relative crystallinity after obtaining Na beta-molecular sieve products C N β-3；CN β-3, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；CN β-3 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete CN β-3 character is shown in Table 1.
(4) ammonium salt exchange and Template removal
Na beta-molecular sieve CN β-3, with embodiment 1, is made H beta molecular sieve CS β-3, XRD determining CS β-3 relative crystallinity by the method for ammonium salt exchange and Template removal；CS β-3 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
By 40 grams of CS β-3 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides, put into mixed grind in chaser with dust technology (mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, support C TCAT-3 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CCAT-3, carrier and corresponding catalyst character and are shown in Table 3.
Comparative example 4
(1) preparation of amorphous silica-alumina predecessor
It is 80g A1 that Solid aluminum sulfate is configured to 100mL concentration2O3 / L aluminum sulfate working solution (a).Strong aqua ammonia is added appropriate distilled water diluting and becomes about 10wt% weak ammonia (b).Take with SiO2The sodium silicate solution of quality meter 28wt%, then to be diluted to 80mL concentration be 150g SiO2/ L sodium silicate working solution (c).Take the steel retort of one 5 liters, after tank adding 0.2 liter of distilled water and being heated with stirring to 70 DEG C, open the valve having (a) and (b) container respectively simultaneously, control the flow of (a) so that neutralizing the response time at 40 minutes, and the flow adjusting rapidly (b) makes the pH value of system be maintained at 7～8, and control the temperature of system at about 60 DEG C.After reacting aluminum sulfate completes, stop adding (b), after stablizing 20 minutes, add (c) 80mL, add in 10 minutes, the ageing process of beginning system, keep pH value 8.0, temperature 60 C, aging 30 minutes, obtaining amorphous silica-alumina predecessor, amorphous silica-alumina predecessor is on the basis of the wgt dry basis by total of silicon dioxide and aluminium oxide, and the content counted with silicon dioxide is as 60wt%.
(2) preparation of gel is with embodiment 1.
(3) crystallization is with embodiment 1, records relative crystallinity after obtaining Na beta-molecular sieve products C N β-4；CN β-4, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；CN β-4 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete CN β-4 character is shown in Table 1.
(4) ammonium salt exchange and Template removal
Na beta-molecular sieve CN β-4, with embodiment 1, is made H beta molecular sieve CS β-4, XRD determining CS β-4 relative crystallinity by the method for ammonium salt exchange and Template removal；CS β-4 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
By 40 grams of CS β-4 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides, put into mixed grind in chaser with dust technology (mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, support C TCAT-4 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CCAT-4, carrier and corresponding catalyst character and are shown in Table 3.
Comparative example 5
(1) preparation of amorphous silica-alumina predecessor is with embodiment 1；
(2) preparation of gel is the most same as in Example 1, and difference is: amorphous silica-alumina predecessor, sodium silicate, tetraethyl ammonium hydroxide and water are according to Al2O3: SiO2: Na2O:H2O=1:80: 1.6: 240, TEAOH/SiO2Total molar ratio of=0.2.
(3) crystallization is with embodiment 1, final prepared Na beta-molecular sieve CN β-5, records relative crystallinity；CN β-5, after roasting in 550 DEG C of air 3 hours, records the relative crystallinity after roasting；CN β-5 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, and concrete CN β-5 character is shown in Table 1.
(4) ammonium salt exchange and Template removal
Na beta-molecular sieve CN β-5, with embodiment 1, is made H beta molecular sieve CS β-5, XRD determining CS β-5 relative crystallinity by the method for ammonium salt exchange and Template removal；CS β-5 is after 750 DEG C of water vapour hydrothermal treatment consists 2 hours, then records the relative crystallinity after hydrothermal treatment consists, the results are shown in Table 2.
By 40 grams of CS β-5 molecular sieves, 90 grams of macroporous aluminium oxides (pore volume 0.9mL/g, specific surface areas 350m2/ g), 90 grams of little porous aluminum oxides, put into mixed grind in chaser with dust technology (mol ratio of nitric acid and little porous aluminum oxide is 0.25), add water, being rolled into paste, extrusion, extrusion bar is dried 4 hours at 110 DEG C, then 550 DEG C of roastings 4 hours, support C TCAT-5 is obtained.
The impregnation liquid room temperature immersion of carrier tungstenic and nickel 2 hours, 120 DEG C are dried 4 hours, and 500 DEG C of roastings of temperature programming 4 hours obtain catalyst CCAT-5, carrier and corresponding catalyst character and are shown in Table 3.
Table 1
| Feed intake SiO2/Al2O3Mol ratio | Specific surface area, m2/g | Pore volume, mL/g | SiO2/Al2O3Mol ratio | Relative crystallinity, % | The reservation degree of crystallization relatively after hydrothermal treatment consists, % | |
| Nβ-1 | 80 | 659 | 0.52 | 72 | 121 | 118 |
| Nβ-2 | 90 | 675 | 0.54 | 80 | 120 | 110 |
| Nβ-3 | 70 | 625 | 0.50 | 63 | 126 | 118 |
| CNβ-1 | 86 | 581 | 0.46 | 28 | 102 | 93 |
| CNβ-2 | 43 | 570 | 0.44 | 33 | 98 | 78 |
| CNβ-3 | 80 | 601 | 0.48 | 60 | 103 | 94 |
| CNβ-4 | 80 | 590 | 0.47 | 54 | 105 | 97 |
| CNβ-5 | 80 | 603 | 0.49 | 63 | 105 | 96 |
Table 2
| Relative crystallinity, % | The reservation degree of crystallization relatively after hydrothermal treatment consists, % | |
| Sβ-1 | 120 | 115 |
| Sβ-2 | 115 | 108 |
| Sβ-3 | 120 | 115 |
| CSβ-1 | 94 | 83 |
| CSβ-2 | 80 | 57 |
| CSβ-3 | 93 | 86 |
| CSβ-4 | 98 | 87 |
| CSβ-5 | 97 | 88 |
Table 3 carrier and the physico-chemical property of catalyst
| Bearer number | TCAT-1 | TCAT-2 | TCAT-3 | CTCAT-1 | CTCAT-2 | CTCAT-3 | CTCAT-4 | CTCAT-5 |
| Beta-molecular sieve, wt% | 10 | 20 | 20 | 20 | 20 | 20 | 20 | 20 |
| Macroporous aluminium oxide, wt% | 70 | 60 | 60 | 60 | 60 | 60 | 60 | 60 |
| Binding agent, wt% | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus | Surplus |
| Specific surface area, m2/g | 481 | 477 | 469 | 452 | 440 | 458 | 451 | 553 |
| Pore volume, mL/g | 0.74 | 0.73 | 0.72 | 0.66 | 0.67 | 0.67 | 0.67 | 0.68 |
| Catalyst is numbered | CAT-1 | CAT-2 | CAT-3 | CCAT-1 | CCAT-2 | CCAT-3 | CCAT-4 | CCAT-5 |
| WO3, wt% | 22.0 | 21.9 | 22.2 | 22.0 | 22.1 | 22.1 | 22.0 | 22.1 |
| NiO, wt% | 5.9 | 5.8 | 6.0 | 6.0 | 5.9 | 6.2 | 6.1 | 6.0 |
| Specific surface area, m2/g | 411 | 406 | 403 | 379 | 373 | 388 | 378 | 393 |
| Pore volume, mL/g | 0.57 | 0.57 | 0.56 | 0.48 | 0.48 | 0.50 | 0.49 | 0.51 |
The invention described above catalyst CAT-1, CAT-2, CAT-3 and comparative example catalyst CCAT-1, CCAT-2, CCAT-3, CCAT-4, CCAT-5 are carried out active evaluation test.Appreciation condition is: reaction stagnation pressure 10.0MPa, hydrogen to oil volume ratio 800, volume space velocity 1.5h during liquid-1, use catalytic diesel oil to be shown in Table 4 as raw oil, raw oil character.Catalyst Activating Test the results are shown in Table 5.
Table 4 raw oil character
| Raw oil | Iran VGO |
| Density (20 DEG C), g/cm3 | 0.9080 |
| IBP/10% | 150/226 |
| 30%/50% | 268/301 |
| 70%/90% | 325/352 |
| 95%/EBP | 370/387 |
| Condensation point, DEG C | 7 |
| S, wt% | 0.92 |
| N, wt% | 0.1178 |
| C, wt% | 85.91 |
| H, wt% | 12.48 |
| Cetane number | 22 |
Table 5 catalyst activity evaluation result
| Catalyst is numbered | CAT-1 | CAT-2 | CAT-3 | CCAT-1 | CCAT-2 | CCAT-3 | CCAT-4 | CCAT-5 |
| Raw oil | Urge bavin | Urge bavin | Urge bavin | Urge bavin | Urge bavin | Urge bavin | Urge bavin | Urge bavin |
| Reaction temperature, DEG C | 370 | 368 | 366 | 370 | 371 | 373 | 372 | 372 |
| Major product character | ||||||||
| Petroleum | ||||||||
| Yield, wt% | 2.3 | 2.0 | 1.8 | 4.3 | 4.2 | 3.8 | 3.7 | 3.6 |
| Virtue is latent, wt% | 53.2 | 53.6 | 54.1 | 48.6 | 49.7 | 50.2 | 51.0 | 50.6 |
| Diesel oil | ||||||||
| Yield, wt% | 96.5 | 96.8 | 97.2 | 91.4 | 92.0 | 93.5 | 93.8 | 93.7 |
| Density (20 DEG C) | ||||||||
| T95, DEG C | 347 | 346 | 345 | 368 | 362 | 357 | 354 | 353 |
| Cetane number | 51.8 | 52.0 | 52.3 | 48.5 | 49.2 | 50.1 | 50.9 | 50.8 |
| Condensation point, DEG C | -23 | -24 | -25 | -6 | -9 | -12 | -14 | -13 |
| Sulfur, μ g/g | 3.1 | 3.2 | 3.2 | 6.2 | 5.9 | 5.2 | 4.9 | 5.0 |
| Liquid is received, wt% | 98.8 | 98.8 | 99.0 | 95.7 | 96.2 | 97.2 | 97.5 | 97.3 |
Be can be seen that by the evaluation result of table 5 catalyst, carrier prepared catalyst of the present invention is under identical process conditions, and diesel yield and product quality are superior to reference catalyst.
Claims (16)
1. a preparation method for diesel oil hydrogenation modification catalyst carrier, including: beta-molecular sieve, macroporous aluminium oxide and binding agent are mixed, molding, drying and roasting, make carrier；On the basis of the weight of carrier, carrier composition includes: the content of beta-molecular sieve is 5～30wt%, and the content of macroporous aluminium oxide is 20～65wt%, and the content of binding agent is 15～50wt%；It is characterized in that: beta-molecular sieve is adopted and prepared with the following method:
(1), using acid-base precipitation method to prepare amorphous silica-alumina predecessor, described amorphous silica-alumina predecessor is on the basis of the gross weight of silicon dioxide and aluminium oxide, and the content that silicon is counted with silicon dioxide is as 40wt%～75wt%, preferably 55wt%～70wt%；Its preparation process includes acid-base neutralization plastic, aging, wherein silicon introduces the method for reaction system is introducing portion silicon-containing compound in aluminum contained compound and precipitant and before plastic and/or during plastic, and remainder silicon-containing compound is in aluminum contained compound with precipitant and after plastic and to introduce before ageing；
(2), by Al2O3: SiO2: Na2O:H2O=1:(62 ~ 130): (0.5～3.0): (100～500), TEAOH/SiO2Total molar ratio of=0.010 ~ 0.095, preferably SiO2/Al2O3Be 70 ~ 110, TEAOH/SiO2=0.020 ~ 0.080, under conditions of 0～40 DEG C of quick stirring, in the amorphous silica-alumina predecessor of step (1) gained, add water, silicon source and template, and control ph is 9.5 ~ 12.0, stirs, obtaining silica-alumina gel, TEA represents the quaternary amine alkali cation in template；
(3), the silica-alumina gel of step (2) gained through two step dynamic crystallizations, then through filtering, washing, prepare Na beta molecular sieve；
(4) the Na beta molecular sieve of step (3) gained is carried out ammonium salt exchange and Template removal processes, prepare beta-molecular sieve.
Preparation method the most according to claim 1, it is characterized in that: described in aluminum contained compound with precipitant and before plastic and/or during plastic the mode of introducing portion silicon-containing compound be: described part silicon-containing compound carries out premixing with described aluminum contained compound and/or precipitant, or silicon-containing compound and is individually added in reaction system during plastic in aluminum contained compound, or the combination of said method.
Preparation method the most according to claim 1, it is characterized in that: in step (1), the silicon-containing compound and after plastic and introduced before ageing in described aluminum contained compound accounts for the 5wt% ~ 85wt% in terms of silicon dioxide of the silicon in amorphous silica-alumina predecessor, preferably 30wt% ~ 70wt% in terms of silicon dioxide.
4. according to the preparation method described in any one in claim 1-3, it is characterised in that: described aluminum contained compound is selected from Al2(SO4)3、AlCl3、Al(NO3)3One or more in solution, with A12O3Quality meter, the concentration of described aluminum contained compound is 30～150g A12O3/L；One or more in sodium hydroxide solution, ammonia, sodium carbonate liquor, sodium bicarbonate solution, sodium aluminate solution of precipitant.
5. according to the preparation method described in any one in claim 1-3, it is characterised in that: described aluminum contained compound is sodium aluminate solution, with A12O3Quality meter, the concentration of described sodium aluminate solution is 40～100g A12O3/ L, described acidic precipitation agent is nitric acid.
6. according to the preparation method described in any one in claim 1-3, it is characterized in that: one or more in waterglass, Ludox and organo-silicon compound of described silicon-containing compound, described organo-silicon compound are preferably one or more in silanol, silicon ether and siloxanes, with SiO2Quality meter, the concentration of described silicon-containing compound is 40～200g SiO2/L。
7. according to the preparation method described in any one in claim 1-3, it is characterised in that: in step (2), one or more in White Carbon black, silica gel, Ludox, waterglass of described silicon source, described template is tetraethyl ammonium hydroxide.
8. according to the preparation method described in any one in claim 1-3, it is characterised in that: in step (1), the condition of described plastic is: temperature is 20～85 DEG C, and pH value is 7.0～10.0, is preferably, and temperature is 40～80 DEG C, and pH value is 7.5～9.0；
Described aging condition is: temperature is 20～85 DEG C, and pH is 7.0～10.0, time 0.2～8.0 hours, is preferably, and temperature is 40～80 DEG C, and pH is 7.0～9.5, and the time is 0.5～5.0 hour.
9. according to the preparation method described in any one in claim 1-3, it is characterised in that: in step (2), generate the reaction temperature 0 of described silica-alumina gel～40 DEG C, pH value is 9.5～12.0, being preferably, the reaction temperature generating described silica-alumina gel is 10～30 DEG C, and pH value is 10～11.
10. according to the preparation method described in any one in claim 1-3, it is characterized in that: in step (3), the silica-alumina gel of step (2) gained includes through the concrete steps of two step dynamic crystallizations: the condition of first step dynamic crystallization is: carry out crystallization under agitation, temperature is 50～90 DEG C, and the time is 0.5～18.0 hour；The condition of second step dynamic crystallization is: carry out crystallization under agitation, and temperature is 100～200 DEG C, and the time is 40～120 hours.
11. preparation methoies according to claim 10, it is characterised in that: in step (3), the condition of described first step dynamic crystallization is: carry out crystallization under agitation, and temperature is 60～80 DEG C, and the time is 1～10 hour；The condition of described second step dynamic crystallization is: carry out crystallization under agitation, and temperature is 120～170 DEG C, and the time is 50～100 hours.
12. preparation methoies according to claim 1, it is characterised in that Na in beta-molecular sieve after the exchange of ammonium salt described in step (4)2O weight content is less than 0.3%.
13. preparation methoies according to claim 1, it is characterised in that the Template removal described in step (4) processes and uses aerobic high-temperature process, treatment temperature is 400～800 DEG C, and the process time is 5～20 hours, is preferably, treatment temperature is 500～700 DEG C, and the process time is 10～15 hours.
14. preparation methoies according to claim 1, it is characterised in that: the pore volume of described macroporous aluminium oxide is 0.7 ~ 1.0
ML/g, specific surface area 200 ~ 500 m2/g。
15. preparation methoies according to claim 1, it is characterised in that: adhesive therefor is little porous aluminum oxide, and the pore volume of little porous aluminum oxide used is 0.3～0.5 mL/g, and specific surface area is 200～400m2/g。
16. preparation methoies according to claim 1, it is characterised in that what described carrier used be dried and roasting condition is as follows: is dried 3～10 hours at a temperature of 80～150 DEG C, 400～800 DEG C of roastings 3～12 hours.
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| CN112547116A (en) * | 2021-01-18 | 2021-03-26 | 太原大成环能化工技术有限公司 | Preparation method of mesoporous Beta molecular sieve with improved yield |
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