CN101205076A - Method for preparing small-grain SAPO-11 molecular sieve - Google Patents
Method for preparing small-grain SAPO-11 molecular sieve Download PDFInfo
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Abstract
The invention relates to a method for preparing a molecular sieve with small crystal of SAPO-11, which does not use any other organics additives except template. The method prepares the molecular sieve with small crystal of SAPO-11 which has a size ranging from 300mm to 800mm and has an AEL structure comprising water, phosphorus source, aluminum source, template, and silica source. The preparation method includes the following steps: (1) the preparation of colloid slurry: according to the total material mole ration of P2O5: (0.5 to 1.5)AL2O3: (0.4 to 2.0) R: (0 to 1.0)SiO2:(17 to 60) H2O, the water, the phosphorus source, the aluminum source, the template and the silica source are added under the condition of temperature of 5 to 80 DEG C, fast mixing and the PH value controlled between 3.5 to 7.0, wherein, R is the template; (2) the aging of slurry: the reaction mixture acquired from step (1) is gel static aged under the temperature of 80 to 190 DEG C for 0.5 to 24 hours then is cooled to the room temperature; (3) the crystallization of the slurry: under the stirring condition, 0 to 200 percent of distilled water of the total mixture is put into the aging solution, then the solution is heated up to 100 to 220 DEG C for continuous crystallization for 4 to 72 hours to get the product by filtering, washing and drying after the crystallization.
Description
Technical field
The present invention relates to a kind of synthetic method of little crystal grain silicon aluminium phosphate molecular sieve analog, be particularly related to a kind of outer any organics additive of template agent removing that do not use, synthesize grain-size has the little crystal grain SAPO-11 molecular sieve of AEL structure at 300～800nm preparation method.
Background technology
Silicon aluminium phosphate (SAPO) molecular sieve is the novel non-zeolitic molecular sieves of being released in 1984 by U.S. combinating carbide company of a class (USP 4440871,1984).The SAPO-11 molecular sieve that wherein has the AEL configuration is paid attention to, and its skeleton is by AlO
4, PO
4And SiO
4Tetrahedron constitutes, and has the oval straight hole of the one dimension road of ten-ring, and its duct size is 0.39nm * 0.63nm.The SAPO-11 molecular sieve obtains broad research in the petrochemical industries such as alkylation, isomerization dewaxing and light olefin polymerization of catalytic cracking, hydrocracking, isomerization, band side chain aromatic hydrocarbons at present.Especially in the isomerization dewaxing technology of lubricating oil distillate, because pore structure and acidity that the SAPO-11 molecular sieve is suitable make it show than other molecular sieve remarkable advantages (Park K C, Ihm S K.Applied Catalysis A:General, 2000,203 (1-2): 201).
The major ingredient of wax is some high boiling long chain alkane molecules in the lubricating oil, by hydroisomerization, makes some straight-chain molecules wherein be converted into the molecule that contains side chain, thereby improves its viscosity index, reduction condensation point, significantly improves its low-temperature fluidity.Because the molecule of lubricating oil distillate is relatively large, its isomerization reaction mainly occurs in outside surface and place, aperture (Cloaude M C, Martens J A.Journal of Catalysis, 2000,190 (1): 39) of catalyzer.So the isomerization of long chain alkane requires the SAPO-11 molecular sieve to have big external surface area; The effective ways that increase the catalyzer external surface area are the particle diameters that reduce catalyzer.How synthesizing small-grain SAPO-11 is the important topic of molecular sieve study on the synthesis.Therefore, the grain-size of SAPO-11 molecular sieve is more little, helps reducing the generation of side reaction-scission reaction more, improves the selectivity of isomerization reaction.
The synthetic technology of existing SAPO-11 molecular sieve comprises USP 4440871, and USP4701485, USP5208005, USP6303534, EP146384 and CN1283587, CN1380251A etc. all adopt conventional hydrothermal method synthetic.Synthesis condition is: with di-n-propylamine and/or Diisopropylamine is template, and pseudo-boehmite is the aluminium source, and phosphoric acid is the phosphorus source, and tetraethoxy or silicon sol are the silicon source, is crystallization 24 hours under 160～220 ℃ the autogenous pressure at crystallization temperature.But for conventional static hydrothermal method,, make that the footpath particle size of molecular sieve is bigger because SAPO-11 molecular sieve nucleus is easy to take place autohemagglutination after forming, generally at 3～10 μ m, in addition bigger.
(Meriaudeau P. such as Li Quanzhi etc. (CN 1392099) and P.Meriaudeau, Tuan Vu.A., Lefebvre F., etal..Microporous and Mesoporous Materials, 1998,22 (1～3): 435) by changing synthetic medium, the SAPO-11 molecular sieve that in water-surfactant-organic alcohol system, has prepared the peracid amount, but sign from scanning electron microscope, this method does not hinder the autohemagglutination of molecular sieve crystal, and the SAPO-11 molecular sieve particle diameter that obtains is still the sphere aggregates of 5～10 μ m.
CN1356264A can obtain grain size at the SAPO-11 of 500～1000nm molecular sieve particle by the method that adds pure type organic (as Virahol) in the colloid admixture forming process, but this method is because the adding of organic alcohols material not only makes synthetic system complicated more, and increased the synthetic cost.
Former research results shows that the particle diameter that reduces molecular sieve helps improving the performance of molecular sieve catalyst, but prior preparation method can not obtain the SAPO-11 molecular sieve of grain size＜1 μ m by relatively inexpensive mode.
Summary of the invention
The purpose of this invention is to provide and a kind ofly form not changing conventional SAPO-11 molecular sieve synthetic raw material, do not use template agent removing any organics additive in addition, substantially do not change under the prerequisite of conventional hydro-thermal synthesis process, synthesize the method for the little crystal grain SAPO-11 of high-crystallinity molecular sieve.
A kind of preparation method of little crystal grain SAPO-11 molecular sieve is made by water, phosphorus source, aluminium source, template, silicon source, by the following steps preparation,
(1) preparation of colloid slurries: according to P
2O
5: (0.5～1.5) Al
2O
3: (0.4～2.0) R: (0～1.0) SiO
2: (17～60) H
2Total molar ratio of O adds entry, phosphorus source, aluminium source, template, silicon source under 5～80 ℃ of quick agitation conditions, control pH value is 3.5～7.0, and wherein R is a template;
(2) slurries is aging: with the reaction mixture gel static-aging of step (1) gained, temperature is controlled at 80～190 ℃, and digestion time is 0.5～24 hour, then it is cooled to room temperature;
(3) crystallization of slurries: under agitation condition, add the distilled water of total mixture amount 0～200% in the aging liquid, be warming up to 100～220 ℃ then, continued crystallization 4～72 hours, after crystallization is finished, after filtration, washing, drying make product.
Described aluminium source is for being aluminium hydroxide, hydrated aluminum oxide, aluminum isopropylate, aluminum nitrate or Tai-Ace S 150; The silicon source is solid silicone, silicon sol or tetraethyl silicate; The phosphorus source is ortho-phosphoric acid, phosphorous acid, Hypophosporous Acid, 50 or metaphosphoric acid; Organic formwork agent is di-n-propylamine or Diisopropylamine or their mixture.
The addition sequence of described phosphorus source, aluminium source, silicon source, water and organic formwork agent preferably adds according to the sequencing in water, phosphorus source, aluminium source, template, silicon source.
Preferred 20～60 ℃ of whipping temp described in the described step (1).Preferred 100～180 ℃ of temperature described in the described step (2), preferred 1～20 hour of digestion time.Preferred 120～210 ℃ of temperature described in the described step (3), preferred 10～70 hours of crystallization time.Optimum ratio is: P
2O
5: (0.6～1.4) Al
2O
3: (0.5～1.6) R: (0～0.8) SiO
2: (20～55) H
2O.Optimum ratio is P
2O
5: (0.7～1.3) Al
2O
3: (0.6～1.5) R: (0～0.6) SiO
2: (25～50) H
2O.
The pH value is adjusted in 3.5～7.0 in the described step (1), for passing through to add acid-alkali accommodation.
The little crystal grain silicoaluminophosphamolecular molecular sieves of a kind of AEL of having structure of gained of the present invention can be used as catalyzer such as the alkylation, isomerization dewaxing of catalytic cracking, hydrocracking, isomerization, band side chain aromatic hydrocarbons.
Method provided by the invention, the mixed serum that step (1) is obtained carries out static-aging earlier, is cooled to room temperature then, and static crystallization at last heats up.Static brilliant (always) change is meant does not carry out any stirring and vibration to reaction mixture, places crystallizing kettle to leave standstill crystalline substance (always) reaction mixture and changes.
Said aluminium source, silicon source, phosphorus source and organic formwork agent are the corresponding raw material that generally adopts in the prior art in the method provided by the invention, and the aluminium source can be aluminium hydroxide, hydrated aluminum oxide, aluminum isopropylate, aluminum nitrate, Tai-Ace S 150 etc. in these raw materials; The silicon source can be solid silicone, silicon sol, tetraethyl silicate etc.; The phosphorus source comprises ortho-phosphoric acid, phosphorous acid, Hypophosporous Acid, 50, metaphosphoric acid etc.; Organic formwork agent comprises di-n-propylamine, Diisopropylamine or their mixture.The aluminium source that other generally adopt, silicon source, phosphorus source and template can be applicable to the present invention too.
Method provided by the present invention does not need to add template agent removing any organism in addition as dispersion agent in reaction-ure mixture, synthetic cost is low.Processing step is simple.Use the method for the invention, can synthesize grain-size at 300～800nm, especially the little crystal grain SAPO-11 molecular sieve between 300～500nm.
Description of drawings
The SEM and the XRD figure of the SAPO-11 molecular sieve that Fig. 1: embodiment 1 obtains
The SEM and the XRD figure of the SAPO-11 molecular sieve that Fig. 2: embodiment 2 obtains
The SEM and the XRD figure of the SAPO-11 molecular sieve that Fig. 3: embodiment 3 obtains
Fig. 4: the SEM and the XRD figure of the SAPO-11 molecular sieve that comparative example 1 obtains
Fig. 5: the SEM and the XRD figure of the SAPO-11 molecular sieve that comparative example 2 obtains
Embodiment
For the present invention is described better, further specify the present invention below in conjunction with example and Comparative Examples, but scope of the present invention is not limited only to these examples.
In each embodiment and comparison example, the qualitative test of the SAPO-11 molecular sieve that synthesizes SIMADU XRD6000 type X-ray diffractometer, experiment condition is: Cu K α source of radiation, pipe is pressed 40Kv, tube current 40mA.Adopt scanning electronic microscope (SEM) to carry out the analysis of sample crystal morphology, the scanning electron microscope instrument is Cambridge S-360.
Specification, the place of production of used reagent and chemical are as follows among each embodiment:
Phosphoric acid: analytical pure, content H
3PO
485.0%wt;
Pseudo-boehmite: industrial goods contain Al
2O
370%wt;
Di-n-propylamine: chemical pure, content＞97%;
Diisopropylamine: chemical pure, content＞97%;
Silicon sol: industrial goods, content 25%wt.
Embodiment 1
Under the agitation condition with 0.4 mole of phosphoric acid (with H
3PO
4Meter, down together) join in 5.1 moles of distilled water, place 35 ℃ of waters bath with thermostatic control to mix, add 0.2 mole of pseudo-boehmite (with Al
2O
3Meter, down with), after stirring reaction becomes glue, the mixed solution of 0.12 mole of di-n-propylamine and 0.08 mole of Diisopropylamine is slowly joined in the above-mentioned gel, add 0.08 mole of silicon sol again (with SiO
2Meter, down together), add acid for adjusting pH value 3.5～7.0, continue to stir and make the gel reaction mixture.
Above-mentioned reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, prior to 130 ℃ of autogenous pressures aging 2.5 hours down, is cooled to room temperature then, adds the distilled water of 50%wt and stirs, again crystallization 20 hours under 190 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, the result as shown in Figure 1.Illustrate that present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, be the SAPO-11 molecular sieve, its grain size is 300～500nm.
Embodiment 2
The preparation of gel reaction mixture is with embodiment 1.Reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, prior to 150 ℃ of autogenous pressures aging 2 hours down, is cooled to room temperature then, adds the distilled water of 60 heavy % and stirs, again crystallization 24 hours under 190 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, the result as shown in Figure 2.Illustrate that present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, be the SAPO-11 molecular sieve, its grain size is 300～400nm.
Embodiment 3
The preparation of gel reaction mixture is with embodiment 1.Reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, and prior to 175 ℃ of autogenous pressures aging 1.5 hours down, portion was cooled to room temperature then, adds 40% distilled water and stirs, again crystallization 28 hours under 190 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, the result as shown in Figure 3.Illustrate that present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, be the SAPO-11 molecular sieve, its grain size is 500～800nm.
Embodiment 4
The preparation of gel reaction mixture is with embodiment 1.Reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, prior to 150 ℃ of autogenous pressures aging 2 hours down, is cooled to room temperature then, adds 70% distilled water and stirs, again crystallization 48 hours under 150 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, presentation of results present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, is the SAPO-11 molecular sieve, and its grain size is 300～400nm.
The preparation of gel reaction mixture is with embodiment 1.Reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, and prior to 150 ℃ of autogenous pressures aging 2 hours down, portion was cooled to room temperature then, adds 40% distilled water and stirs, again crystallization 70 hours under 130 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, presentation of results present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, is the SAPO-11 molecular sieve, and its grain size is 300～500nm.
Embodiment 6
Under the agitation condition 0.4 mole of phosphoric acid is joined in 8.0 moles of distilled water, place 50 ℃ of waters bath with thermostatic control to mix, add 0.26 mole of pseudo-boehmite, after stirring reaction becomes glue, the mixed solution of 0.16 mole of di-n-propylamine and 0.14 mole of Diisopropylamine is slowly joined in the above-mentioned gel, add 0.12 mole of silicon sol again, add acid for adjusting pH value, continue to stir and make the gel reaction mixture 3.5～7.0.
Above-mentioned reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, prior to 100 ℃ of autogenous pressures aging 8 hours down, is cooled to room temperature then, adds the distilled water of 100%wt and stirs, again crystallization 18 hours under 210 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, its presentation of results present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, is the SAPO-11 molecular sieve, and its grain size is 400～500nm.
Embodiment 7
Under the agitation condition 0.6 mole of phosphoric acid is joined in 9.0 moles of distilled water, place 20 ℃ of waters bath with thermostatic control to mix, add 0.24 mole of pseudo-boehmite, after stirring reaction becomes glue, the mixed solution of 0.15 mole of di-n-propylamine and 0.06 mole of Diisopropylamine is slowly joined in the above-mentioned gel, add 0.15 mole of silicon sol again, add acid for adjusting pH value, continue to stir and make the gel reaction mixture 3.5～7.0.
Above-mentioned reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, prior to 140 ℃ of autogenous pressures aging 4 hours down, is cooled to room temperature then, adds the distilled water of 70%wt and stirs, again crystallization 36 hours under 175 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, its presentation of results present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, is the SAPO-11 molecular sieve, and its grain size is 300～500nm.
The comparative example 1
The preparation of gel reaction mixture is cancelled the preceding aging step of crystallization with embodiment 1.Reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, and crystallization is 24 hours under 190 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, the result as shown in Figure 4.Illustrate that present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, be the SAPO-11 molecular sieve, its grain size is～10 μ m.
The comparative example 2
The preparation of gel reaction mixture is cancelled the preceding aging step of crystallization with embodiment 1.Reaction mixture packed into to be had in the crystallizing kettle of polytetrafluoroethylene bushing, and crystallization is 24 hours under 150 ℃ of autogenous pressures.At last crystallization product is filtered, washing and 100～110 ℃ of oven dry, promptly get molecular screen primary powder.
Get partially-crystallized product and make X-ray diffraction and SEM mensuration, the result as shown in Figure 5.Illustrate that present method synthetic silicoaluminophosphamolecular molecular sieves has the AEL structure, be the SAPO-11 molecular sieve, its grain size is 10～15 μ m.
Claims (8)
1. the preparation method of one kind little crystal grain SAPO-11 molecular sieve is made by water, phosphorus source, aluminium source, template, silicon source, it is characterized in that: by the following steps preparation,
(1) preparation of colloid slurries: according to P
2O
5: (0.5～1.5) Al
2O
3: (0.4～2.0) R: (0～1.0) SiO
2: (17～60) H
2Total molar ratio of O adds entry, phosphorus source, aluminium source, template, silicon source under 5～80 ℃ of quick agitation conditions, control pH value is 3.5～7.0, and wherein R is a template;
(2) slurries is aging: with the reaction mixture gel static-aging of step (1) gained, temperature is controlled at 80～190 ℃, and digestion time is 0.5～24 hour, then it is cooled to room temperature;
(3) crystallization of slurries: under agitation condition, add the distilled water of total mixture amount 0～200% in the aging liquid, be warming up to 100～220 ℃ then, continued crystallization 4～72 hours, after crystallization is finished, after filtration, washing, drying make product.
2. it is characterized in that in accordance with the method for claim 1: described aluminium source is for being aluminium hydroxide, hydrated aluminum oxide, aluminum isopropylate, aluminum nitrate or Tai-Ace S 150; The silicon source is solid silicone, silicon sol or tetraethyl silicate; The phosphorus source is ortho-phosphoric acid, phosphorous acid, Hypophosporous Acid, 50 or metaphosphoric acid; Organic formwork agent is di-n-propylamine or Diisopropylamine or their mixture.
3. it is characterized in that in accordance with the method for claim 1: the addition sequence of phosphorus source, aluminium source, silicon source, water and organic formwork agent preferably adds according to the sequencing in water, phosphorus source, aluminium source, template, silicon source.
4. it is characterized in that in accordance with the method for claim 1: preferred 20～60 ℃ of the whipping temp described in the described step (1).
5. in accordance with the method for claim 1, it is characterized in that: preferred 100～180 ℃ of the temperature described in the described step (2), preferred 1～20 hour of digestion time.
6. in accordance with the method for claim 1, it is characterized in that: preferred 120～210 ℃ of the temperature described in the described step (3), preferred 10～70 hours of crystallization time.
7. it is characterized in that in accordance with the method for claim 1: optimum ratio is: P
2O
5: (0.6～1.4) Al
2O
3: (0.5～1.6) R: (0～0.8) SiO
2: (20～55) H
2O.
8. it is characterized in that in accordance with the method for claim 7: optimum ratio is P
2O
5: (0.7～1.3) Al
2O
3: (0.6～1.5) R: (0～0.6) SiO
2: (25～50) H
2O.
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