CN105983443A - Double-peak-pore-structured aluminum oxide supporter and preparation method thereof - Google Patents
Double-peak-pore-structured aluminum oxide supporter and preparation method thereof Download PDFInfo
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Abstract
A preparation method of a double-peak-pore-structured aluminum oxide supporter includes the steps of: mixing hydrated aluminum oxide, a bonding agent, a chemical pore expanding agent, and an organic pore expanding agent, shaping the mixture and roasting the mixture, wherein the bonding agent is synthetic cellulose, the chemical pore expanding agent is a boron-containing compound, the organic pore expanding agent is a powdery high-polymer, the roast temperature is 500-1000 DEG C and the roast time is 1-8 h. The invention also relates to the double-peak-pore-structured aluminum oxide supporter prepared through the method.
Description
Technical field
The present invention is about a kind of alumina support and preparation method thereof, is bimodal about one in particular
Pore structure alumina support and preparation method thereof.
Background technology
Inferior heavy oil such as residual oil etc. are containing metal impurities such as higher Ni, V, it usually needs at hydrogenation
Reason removes, in order to through follow-up processing (such as catalytic cracking), produce the oil such as the vapour of cleaning, diesel oil
Product and industrial chemicals.In the inferior heavy oil such as research shows, residual oil, metal impurities are primarily present in colloid and Colophonium
In matter, moieties molecular weight is big, structure is complicated for this, and diffusion difficulty, therefore it is required that catalyst has excellent
Pore passage structure, it is simple to the diffusion of macromolecular reaction thing, react and deposit.At present, residuum hydrogenating and metal-eliminating
Catalyst generally uses structure of double peak holes aluminium oxide as carrier.In course of reaction, bore dia is at 100nm
The diffusion that above macropore is macromolecular reaction material provides passage, promotes the impurity internal gutter to catalyst
Diffusion and deposition；Bore dia then provides reaction surface and depositional site for impurity in the duct of below 50nm.
Two class duct synergism, so that catalyst has high metal removal activity and high appearance impurity ability.
CN1103009A discloses a kind of preparation method with double-hole alumina support, and the method is by two
Plant the different aluminium oxide of pore-size distribution or its precursor mixes with carbon powder, surfactant, peptizer and water
Molding, drying and roasting are made.When using carbon powder as expanding agent, reaming effect is poor, and carries
Body intensity is relatively low, and meanwhile, the membership that adds of peptizer reduces pore volume and the aperture of carrier.
CN1120971 discloses the preparation method of a kind of alumina supporter, and the method is by two kinds
Or boehmite dry glue prepared by two or more different material route methods uniformly mixes, then carry out glue
Molten, molding, it is dried and roasting.But the method uses oil ammonia column method to carry out the molding of alumina support, produces
Efficiency is low and production process is polluted relatively big, the most less employing.
CN1647857A discloses the preparation method of a kind of macropore alumina supporter, and the method will contain Organic substance
The boehmite compositions of expanding agent is shaped and roasting, obtains the carrying alumina with structure of double peak holes
Body.The method needs first organic expanding agent and boehmite pulled an oar and be spray-dried, and preparation process is the most multiple
Miscellaneous.
In existing carrying alumina Antibody Production Techniques, be both needed to add when aluminium oxide molding such as nitric acid, acetic acid,
The acidic materials such as aluminum nitrate are as peptizer, and the particle structure adding the disruptive oxidation aluminum of membership of acidic materials,
Reduce pore volume and the aperture of carrier.Reducing Aci-Jel solvent is to prepare macropore oxygen to alumina pore structural damage
Change a kind of effective technology route of alumina supporter, such as CN1154668 and CN1611578 all in aluminium oxide kneading
Forming process adds certain ammonia peptization acid is carried out part neutralization, thus reach to increase carrier pore volume aperture
Purpose, but this kind of method can not thoroughly eliminate the acidic materials adverse effect to carrier hole structure, and effect has
Limit.
Summary of the invention
It is an object of the invention to for the deficiencies in the prior art, it is provided that one has structure of double peak holes, pore volume hole
Footpath is big, mechanical strength good, the preparation method of the simple alumina support of preparation process, prepared by the inventive method
Alumina support can use as catalyst carrier for hydrgenating particularly residuum hydrogenating and metal-eliminating catalyst carrier.
The method that the present invention provides includes hydrated alumina and binding agent, chemical enlargement agent and organic expanding agent
Mixing, molding roasting, described binding agent is synthetic cellulose, and described chemical enlargement agent is boron-containing compound,
Described organic expanding agent is powder high polymer, and sintering temperature is 500-1000 DEG C, and roasting time is that 1-8 is little
Time.
Compared with the conventional method, the present invention provides method not use Aci-Jel solvent in carrier forming process,
Reduce the acid destruction to hydrated alumina particle structure, thus carrier pore volume and aperture are the biggest；Organic expansion
The addition of hole agent is relatively low, advantageously reduces preparation cost and prevents roasting process generation temperature runaway phenomenon；And system
Standby process is simple, and production efficiency is higher.
The alumina support prepared by provider's method of the present invention has typical structure of double peak holes.Such as, according to
Alumina support prepared by provider's method of the present invention through 800 DEG C of roastings 3 hours, pore volume be 1.2 milliliters/gram,
Characteristic peak occur in 25 nanometers and 250 nanometers respectively, bore dia accounts for total hole at the pore volume of 20-50 nanometer
40.5% held, pore volume accounts for the 24.1% of total pore volume at the pore volume of 100-2000 nanometer, and bore dia is less than 20nm
Hole account for the 28.2% of total pore volume
Detailed description of the invention
According to method provided by the present invention, described hydrated alumina is selected from gibbsite, boehmite, plan
One or more mixture among boehmite and amorphous hydroted alumina.Preferably intend thin water aluminum
Stone.They can be commercial goods can also be that in prior art prepared by any one method.As used sulphuric acid
Aluminum-sodium metaaluminate method prepares boehmite.
Described binding agent is synthetic cellulose, can be methylcellulose, ethyl cellulose, hydroxypropyl methyl
One or more in cellulose, hydroxyethylmethyl-cellulose；Its 2% aqueous solution of described synthetic cellulose glues
Degree is not less than 100000mPa s；The addition of described synthetic cellulose is the 1-5% of alumina weight.
One or more in boric acid, boron oxide, borate of described boron-containing compound；In terms of pure boron,
The addition of described boron-containing compound is the 1-4% of alumina weight.
Described organic expanding agent is selected from pva powder, nitrile rubber powder, Polystyrene powder, wooden
One or more in cellulose；The particle diameter of described organic expanding agent is 75-180 μm；Described organic
The addition of expanding agent is the 2-8% of alumina weight.
Why boron-containing compound is used in combination by the present invention with powder high polymer, is primarily due to
Experimentation finding, the effect that both are used in combination is substantially better than the two and is used alone, is particularly increasing
Add more than 100nm duct aspect in carrier.High polymer class is had by this mainly by boron-containing compound
The facilitation of machine expanding agent reaming effect, as polyvinyl alcohol can occur " solidifying when running into boron-containing compound
Gel " reaction, thus form more macropore duct.
Described sintering temperature is preferably 700-900 DEG C, and roasting time is preferably 2-4 hour.
Described forming method can use conventional method to carry out, and such as tabletting, spin and extrusion etc., is preferably and squeezes
Bar.Support shapes can be changed as required, such as cylinder, Herba Trifolii Pratentis, Herba Galii Bungei etc..In forming process
Appropriate extrusion aid and water can be added.
The alumina support that the inventive method is provided, has structure of double peak holes, as used mercury injection method to measure,
Its pore volume is 0.9-1.6 ml/g, and bore dia accounts for the 30-70% of total pore volume, hole at the pore volume of 20-50 nanometer
Hold the 15-40% accounting for total pore volume at the pore volume of 100-2000 nanometer, the bore dia Zhan Zong hole, hole less than 20nm
The ratio held is less than 50%, and BET specific surface area is 100-300 meters squared per gram.
The alumina support that the inventive method provides has big pore volume aperture and structure of double peak holes, can conduct
Catalyst carrier for hydrgenating particularly residuum hydrogenating and metal-eliminating catalyst carrier uses.
Inventive feature is further illustrated below with embodiment and comparative example.
Embodiment 1
Weigh the macropore boehmite dry glue powder (contents on dry basis that Yantai Heng Hui Chemical Co., Ltd. produces
71.5wt%) 500g, adds the hydroxypropyl methyl that viscosity is 150,000 mPa s (referring to the viscosity of 2% aqueous solution) fine
Dimension element 10.7g, particle diameter are the pva powder 17.9g of 90-150 μm, mix homogeneously；By 40.9g
Boric acid is dissolved in 390g water purification, is slowly added in afore-mentioned materials, and kneading becomes plastic, then squeezes front
The cloverleaf pattern of a diameter of 1.6mm it is extruded on formula single-screw extruder.It is dried 2.0 hours at 120 DEG C,
Inserting in roaster again, in 800 DEG C of constant temperature 3 hours, obtain carrier A, its physico-chemical property is listed in table 1
In.
Embodiment 2
Weighing aforementioned boehmite 500g, adding viscosity is 150,000 mPa s (referring to the viscosity of 2% aqueous solution)
Hydroxypropyl methyl cellulose 3.6g, particle diameter be 90-150 μm pva powder 18.6g and
The lignocellulose 10.0g of a diameter of 80-160 μm of grain, mix homogeneously；20.5 grams of boric acid are dissolved in 390
In g water purification, it is shaped according to preceding method and is dried, with 900 DEG C of constant temperature 2 hours in roaster,
Obtaining carrier B, its physico-chemical property is shown in Table 1.
Embodiment 3
Weighing aforementioned boehmite 500g, adding viscosity is 100,000 mPa s (referring to the viscosity of 2% aqueous solution)
Hydroxyethylmethyl-cellulose 17.9g, particle diameter be the nitrile rubber powder 17.9g of 75-140 μm, oxygen
Change boron 28.6g mix homogeneously；31.0 grams of boric acid are dissolved in 390g water purification, carry out according to preceding method
Molding and being dried, with 700 DEG C of constant temperature 4 hours in roaster, obtains support C, and its physico-chemical property is listed in
In table 1.
Embodiment 4
Weighing aforementioned boehmite 500g, adding viscosity is 150,000 mPa s (referring to the viscosity of 2% aqueous solution)
Hydroxypropyl methyl cellulose 6.7g and methyl that viscosity is 100,000 mPa s (referring to the viscosity of 2% aqueous solution) fine
Dimension element 4.0g, particle diameter are the Polystyrene powder 7.2 grams of 106-180 μm, boron oxide 28.6g, mixed
Close uniformly；Add water purification 390g, be shaped according to preceding method and be dried, with 850 in roaster
DEG C constant temperature 3 hours, obtains carrier D, and its physico-chemical property is shown in Table 1.
Embodiment 5
Weighing aforementioned boehmite 500g, adding viscosity is 150,000 mPa s (referring to the viscosity of 2% aqueous solution)
Hydroxypropyl methyl cellulose 10.7g, particle diameter be 90-150 μm pva powder 12.9g and
Particle diameter is the Polystyrene powder 5.0g of 106-180 μm, mix homogeneously；By 20.0g boric acid and 13.5g
Ammonium borate is dissolved in 390g water purification, is shaped according to preceding method and is dried, with 850 in roaster
DEG C constant temperature 3 hours, obtains carrier E, and its physico-chemical property is shown in Table 1.
Comparative example 1-2 illustrates existing method and the alumina supporter prepared by existing method.
Comparative example 1
This comparative example is to prepare alumina support according to the method described by CN1103009A.
By 34.1g aluminum hydroxide solid elastomer powder (the alkyl aluminum hydrolysis product of salic 75%) and aluminum sulfate method
High wear-resistant carbon black 4.7g and surfactant SA-203.5g is added after the aluminium hydrate powder 39.3g mixing prepared
Fully grind mixed with 2.1g aluminum nitrate, 66 milliliters of water, banded extruder be extruded into 1.8 millimeters of cloverleaf patterns of diameter,
120 DEG C of drying, 600 DEG C of roastings 4 hours, obtain carrier F, its physico-chemical property is shown in Table 1.
Comparative example 2
This comparative example is to prepare alumina support according to the method described by CN1647857A.
Use aluminium hydroxide and aluminium hydroxide react prepare concentration be 200g aluminium oxide/liter NaAlO2Solution,
By this solution and concentration be 90g aluminium oxide/liter aluminum sulfate solution be added simultaneously to one 2 in manner of cocurrent flow
In the plastic cans risen, being placed in advance in 1.5 liters of water in tank, sodium metaaluminate flow is 1.1 ls/h, regulates sulfur
The flow of acid aluminum solutions, making plastic pH value is 8, and gelling temperature is 50 DEG C, and the serosity that plastic generates is one
Collect in individual ageing can.In collecting complete ageing can, addition sodium carbonate regulation pH value is to 10, and aging 50
Minute, filter and wash, prepare boehmite wet cake.Take this wet cake 6.5 kilograms and sesbania powder 20.5g
Mixing, adds making beating, is spray-dried afterwards under conditions of inlet temperature 600 DEG C, outlet temperature 145 DEG C,
By dry resulting composition extruded moulding on banded extruder, and it is dried at 120 DEG C, roasting 3.5 at 800 DEG C
Hour, obtaining carrier G, its physico-chemical property is shown in Table 1.
Comparative example 3
Weigh the macropore boehmite dry glue powder (contents on dry basis that Yantai Heng Hui Chemical Co., Ltd. produces
71.5wt%) 500g, adds the hydroxypropyl methyl that viscosity is 150,000 mPa s (referring to the viscosity of 2% aqueous solution) fine
Dimension element 10.7g, mix homogeneously；58.8g boric acid is dissolved in 390g water purification, is slowly added to preceding
In material, kneading becomes plastic, is then extruded into the three of a diameter of 1.6mm on front crowded formula single-screw extruder
Leaf grass shape.It is dried 2.0 hours at 120 DEG C, then inserts in roaster, in 800 DEG C of constant temperature 3 hours,
Obtaining carrier H, its physico-chemical property is shown in Table 1.
Comparative example 4
Weigh the macropore boehmite dry glue powder (contents on dry basis that Yantai Heng Hui Chemical Co., Ltd. produces
71.5wt%) 500g, adds the hydroxypropyl methyl that viscosity is 150,000 mPa s (referring to the viscosity of 2% aqueous solution) fine
Dimension element 10.7g, particle diameter are the pva powder 58.8g of 90-150 μm, mix homogeneously；By 390
G water purification is slowly added in afore-mentioned materials, and kneading becomes plastic, then squeezes on front crowded formula single-screw extruder
Become the cloverleaf pattern of a diameter of 1.6mm.It is dried 2.0 hours at 120 DEG C, then inserts in roaster, in
800 DEG C of constant temperature 3 hours, obtains carrier I, and its physico-chemical property is shown in Table 1.
Table 1 carrier physico-chemical property
The result of table 1 shows, compared with comparative example, alumina support prepared by the inventive method has bright
Aobvious structure of double peak holes, and pore volume is big, aperture big, more than 100nm macropore is higher, support strength is high；
It can also be seen that powder high polymer class organic compound and boracic from comparative example 3,4 with embodiment 1
Compound is expanding agent, and the effect that both are used in combination is substantially better than the two and is used alone, particularly exists
Increase more than 100nm duct aspect in carrier.This mainly by boron-containing compound to high polymer class
The facilitation of organic expanding agent reaming effect, as polyvinyl alcohol can occur when running into boron-containing compound
" gelation " reacts, thus forms more macropore duct.
Claims (11)
1. the preparation method of an alumina supporter, it is characterized in that, the method includes mixing hydrated alumina with binding agent, chemical enlargement agent and Organic substance expanding agent, molding roasting, described binding agent is synthetic cellulose, described chemical enlargement agent is boron-containing compound, described organic expanding agent is powder high polymer, and described sintering temperature is 500-1000 DEG C, and roasting time is 1-8 hour.
The preparation method of alumina supporter the most according to claim 1, it is characterised in that one or more in methylcellulose, ethyl cellulose, hydroxypropyl methyl cellulose, hydroxyethylmethyl-cellulose of described synthetic cellulose.
The preparation method of alumina supporter the most according to claim 2, it is characterised in that its 2% solution viscosity of described synthetic cellulose is not less than 100000mPa s.
4. according to the preparation method of the alumina supporter described in any one of claims 1 to 3, it is characterised in that the addition of described synthetic cellulose is the 1-5% of alumina weight.
The preparation method of alumina supporter the most according to claim 1, it is characterised in that one or more in boric acid, boron oxide, borate of described boron-containing compound.
The most according to claim 1 or 5, the preparation method of alumina supporter, it is characterised in that in terms of pure boron, the addition of described boron-containing compound is the 1-4% of alumina weight.
The preparation method of alumina supporter the most according to claim 1, it is characterised in that one or more in pva powder, nitrile rubber powder, Polystyrene powder, lignocellulose of described organic expanding agent.
The preparation method of alumina supporter the most according to claim 7, it is characterised in that the particle diameter of described organic expanding agent is 75-180 μm.
9. according to the preparation method of the alumina supporter described in claim 1 or 7, it is characterised in that the 2-8% that addition is alumina weight of described organic expanding agent.
The preparation method of alumina supporter the most according to claim 1, it is characterised in that described sintering temperature is 700-900 DEG C, roasting time is 2-4 hour.
11. 1 kinds of alumina supporters, its be claim 1～10 any one alumina supporter preparation method prepare alumina support.
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Cited By (7)
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| CN107913691A (en) * | 2016-10-10 | 2018-04-17 | 中国石油天然气股份有限公司 | Alumina support containing macropore and preparation method thereof |
| CN108236939A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气股份有限公司 | A kind of alumina support of containing mesopore/macropore and preparation method thereof |
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| CN109897663A (en) * | 2017-12-07 | 2019-06-18 | 中国石油天然气股份有限公司 | A kind of processing method of FCC gasoline desulfurization |
| CN111420710A (en) * | 2020-04-29 | 2020-07-17 | 煤炭科学技术研究院有限公司 | Alumina carrier with double-peak pore structure and preparation method thereof |
| CN111604074A (en) * | 2020-06-29 | 2020-09-01 | 煤炭科学技术研究院有限公司 | Coal tar double-peak pore structure hydrogenation pretreatment catalyst and preparation method thereof |
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| CN107913691A (en) * | 2016-10-10 | 2018-04-17 | 中国石油天然气股份有限公司 | Alumina support containing macropore and preparation method thereof |
| CN107913691B (en) * | 2016-10-10 | 2020-06-09 | 中国石油天然气股份有限公司 | Alumina carrier containing macropores and preparation method thereof |
| CN108236939B (en) * | 2016-12-27 | 2020-05-08 | 中国石油天然气股份有限公司 | Alumina carrier containing mesopores/macropores and preparation method thereof |
| CN108236939A (en) * | 2016-12-27 | 2018-07-03 | 中国石油天然气股份有限公司 | A kind of alumina support of containing mesopore/macropore and preparation method thereof |
| CN109897663B (en) * | 2017-12-07 | 2021-07-02 | 中国石油天然气股份有限公司 | FCC gasoline desulfurization treatment method |
| CN109897663A (en) * | 2017-12-07 | 2019-06-18 | 中国石油天然气股份有限公司 | A kind of processing method of FCC gasoline desulfurization |
| CN109894122B (en) * | 2017-12-07 | 2021-06-01 | 中国石油天然气股份有限公司 | FCC gasoline hydrodesulfurization catalyst and preparation method thereof |
| CN109894122A (en) * | 2017-12-07 | 2019-06-18 | 中国石油天然气股份有限公司 | A kind of FCC gasoline Hydrobon catalyst and preparation method thereof |
| CN111420710A (en) * | 2020-04-29 | 2020-07-17 | 煤炭科学技术研究院有限公司 | Alumina carrier with double-peak pore structure and preparation method thereof |
| CN111420710B (en) * | 2020-04-29 | 2022-12-06 | 煤炭科学技术研究院有限公司 | Alumina carrier with double-peak pore structure and preparation method thereof |
| CN111604074A (en) * | 2020-06-29 | 2020-09-01 | 煤炭科学技术研究院有限公司 | Coal tar double-peak pore structure hydrogenation pretreatment catalyst and preparation method thereof |
| CN111604074B (en) * | 2020-06-29 | 2022-12-13 | 煤炭科学技术研究院有限公司 | Coal tar double-peak pore structure hydrogenation pretreatment catalyst and preparation method thereof |
| CN115475610A (en) * | 2021-06-15 | 2022-12-16 | 中国石油化工股份有限公司 | Alpha-alumina carrier and preparation method thereof, silver catalyst and olefin epoxidation method |
| CN115475610B (en) * | 2021-06-15 | 2024-03-29 | 中国石油化工股份有限公司 | Alpha-alumina carrier, preparation method thereof, silver catalyst and olefin epoxidation method |
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