CN106673002B - The synthetic method of ZSM-11/ZSM-5 composite molecular screen and its composite molecular screen of synthesis - Google Patents
The synthetic method of ZSM-11/ZSM-5 composite molecular screen and its composite molecular screen of synthesis Download PDFInfo
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Abstract
The present invention relates to a kind of synthetic method of ZSM-11/ZSM-5 composite molecular screen and its composite molecular screens of synthesis.The method includes making silicon source, silicon source, alkali source, organic formwork agent and water contact under crystallization condition, the step of to obtain molecular sieve；Optionally, the step of roasting the molecular sieve of the acquisition；Wherein, the organic formwork agent R is selected from least one of 1,3- hexamethylene dimethylamine or Isosorbide-5-Nitrae-hexamethylene dimethylamine, can be used in the industrial production of ZSM-11/ZSM-5 composite molecular screen.
Description
Technical field
The present invention relates to a kind of synthetic method of ZSM-11/ZSM-5 composite molecular screen and its composite molecular screens of synthesis.
Background technique
ZSM-11 molecular sieve is to be synthesized for the first time by mobil oil oil company (Mobil) the 1970s.It is subsequent to grind
Study carefully discovery ZSM-11 molecular sieve and belong to tetragonal crystal system, ZSM-11 and ZSM-5 molecular sieve belong to Pentasil family.Two kinds of molecules
The structure similarity of sieve is the laminated structure that secondary structure unit has same form；The difference is that neighboring secondary knot
The symmetry of structure unit between layers is different.ZSM-5 meets symmetrical centre correlation；And ZSM-11 meets mirror surface correlation, has
It is parallel to the ten-ring two dimension straight hole road in the direction a and the direction b, pore size is 0.54nm × 0.53nm.Compare ZSM-11 molecule
Sieve finds that the XRD spectra of the two has differences at 2 θ=22.4~24.8 ° and 44.5~46 °, sees below with ZSM-5 molecular sieve
Table.
ZSM-11 and ZSM-5 molecular sieve XRD diffraction maximum compare
Because the pore size of ZSM-11 molecular sieve is less than ZSM-5 molecular sieve, selected in the reaction of type selective catalysis in small molecule
It may show catalytic performance more better than ZSM-5 molecular sieve.
The synthesis of ZSM-11 molecular sieve uses tetrabutylammonium bromide or tetrabutylammonium hydroxide for organic formwork agent.The U.S. is special
Sharp US3709979 discloses a kind of using tetraalkyl cation (R4X+, X is N or P, and R is alkyl, can be methyl, ethyl, third
Base, butyl, benzyl or triphenyl) do the method that template synthesizes ZSM-11 molecular sieve.Chinese patent CN201210003750 is public
A kind of method for using tetrabutylammonium bromide for organic formwork agent, while adding crystal seed synthesis ZSM-11 molecular sieve is opened.China
Patent CN201310697846, which is disclosed, a kind of uses tetrabutylammonium hydroxide and 1,8- octamethylenediamine to close for compound organic formwork agent
At the method for ZSM-11 molecular sieve.Chinese patent CN201410322401 discloses a kind of using tetrabutylammonium hydroxide or four fourths
Base ammonium bromide is the method that organic formwork agent synthesizes the ZSM-11 molecular sieve containing B element.Chinese patent CN102464335 is disclosed
It is a kind of to use tetrabutylammonium bromide or tetrabutylammonium hydroxide for organic formwork agent, while adding the synthesis of EU-1 molecular sieve seed
The method of ZSM-11 molecular sieve.Chinese patent CN201110214475, which is disclosed, a kind of uses tetrabutylammonium hydroxide for template
The method of fractional crystallization synthesis ZSM-11 molecular sieve.
Summary of the invention
One of the object of the invention is intended to provide a kind of synthetic method of new ZSM-11/ZSM-5 composite molecular screen.This method
The ZSM-11/ZSM-5 composite molecular screen of synthesis has ZSM-11 crystal content height, and the controllable model of the content of ZSM-11 crystal phase
Enclose wide feature.The two of the object of the invention are intended to provide a kind of ZSM-11/ZSM-5 composite molecular screen of the method synthesis.
One of for achieving the above object, the technical solution adopted by the present invention is as follows：A kind of ZSM-11/ZSM-5 is compound
The synthetic method of molecular sieve, being included under crystallization condition makes silicon source, silicon source, alkali source, organic formwork agent and water contact, to be divided
The step of son sieve；Optionally, the step of roasting the molecular sieve of the acquisition；Wherein, the organic formwork agent R is selected from 1,3- ring
At least one of F-dimethylamine or 1,4- hexamethylene dimethylamine.
In above-mentioned technical proposal, the silicon source, source of aluminium, the molar ratio of the alkali source, the organic formwork agent R and water
It is 1：(0.0005~0.05)：(0.001~0.8)：(0.05~2.0)：(5~100)；Preferably 1：(0.005~0.04)：
(0.05~0.6)：(0.05~1.0)：(10~50)；More preferably 1：(0.003~0.025)：(0.09~0.5)：(0.08~
0.8)：(12~50).
In above-mentioned technical proposal, the crystallization condition includes：130~190 DEG C of crystallization temperature, crystallization time 1~10 day；It is excellent
It is selected as 145~175 DEG C of crystallization temperature, crystallization time 2~10 days.
In above-mentioned technical proposal, the roasting condition includes：300~800 DEG C of maturing temperature, calcining time 1~10 hour；
Preferably 400~650 DEG C of maturing temperature, calcining time 3~6 hours；Calcination atmosphere is air or oxygen.
In above-mentioned technical proposal, the silicon source is selected from silicic acid, silica gel, silica solution, silicic acid tetraalkyl ester, sodium metasilicate, water glass
At least one of glass or white carbon black；It is preferably selected from least one of silicic acid, silica gel, silica solution or silicic acid tetraalkyl ester.
In above-mentioned technical proposal, source of aluminium is selected from aluminium hydroxide, sodium aluminate, aluminium alcoholates, aluminum nitrate, aluminum sulfate, kaolin
Or at least one of montmorillonite；It is preferably selected from least one of aluminium hydroxide, sodium aluminate or aluminum nitrate.
In above-mentioned technical proposal, it is cationic alkali that the alkali source, which is selected from alkali or alkaline earth metal,；Preferably hydrogen-oxygen
Change sodium.
In above-mentioned technical proposal, heating method use direct-fired mode, perhaps by the way of microwave heating or
Using the complex method directly heated with microwave heating；It is preferred that using direct-fired mode.
For achieving the above object two, the technical solution adopted by the present invention is as follows：A kind of ZSM-11/ZSM-5 is compound
Molecular sieve, in the composite molecular screen, the content of ZSM-11 crystal phase is not less than 90 weight %, preferably 75 weight %, and more preferable 60
Weight %, more preferable 45 weight %, more preferable 30 weight %.
In above-mentioned technical proposal, impurity is contained in the composite molecular screen, impurity content is not higher than 10 weight %, preferably not
Higher than 5 weight %, more preferably no higher than 3 weight %.
In above-mentioned technical proposal, the impurity is selected from unformed SiO2, different from at least one point of ZSM-11 and ZSM-5
At least one of sub- sieve, metal oxide, quartz, tridymite, cristobalite.It is preferred that unformed SiO2、ZSM-23、ZSM-22、
At least one of Beta, MCM-22, MOR, Y type, X-type, A type molecular sieve；More preferable unformed SiO2, in MOR at least one
Kind.
In above-mentioned technical proposal, the existence form of ZSM-11/ZSM-5 composite molecular screen and impurity in the composite molecular screen
Including at least one of physical mixed, cocrystallization.
In above-mentioned technical proposal, it is preferable that the impurity is the unformed SiO that content is not higher than 10 weight %2。
The method of the present invention is used selected from least one of 1,3- hexamethylene dimethylamine or 1,4- hexamethylene dimethylamine as organic
Template has directly synthesized high-purity ZSM-11/ZSM-5 composite molecular screen product, ZSM-11/ZSM-5 compound molecule in product
The content that the purity of sieve can be up to 98 weight %, ZSM-11 crystal phases is adjustable within the scope of 30~98 weight %.The method of the present invention
Simply, raw material is cheap, is suitble to large-scale industrial production, achieves preferable technical effect.
Detailed description of the invention
Fig. 1 is【Embodiment 1】The XRD spectrum of the ZSM-11/ZSM-5 composite molecular screen of synthesis.
The present invention will be further described below by way of examples.
Specific embodiment
In the context of the present specification, the existence form of so-called ZSM-11/ZSM-5 composite molecular screen and impurity, including
Physical mixed, cocrystallization.Wherein, physical mixed refers between ZSM-11/ZSM-5 composite molecular screen crystal and impurity without chemical mutual
Effect；Cocrystallization refers in the crystal of ZSM-11/ZSM-5 composite molecular screen product while comprising ZSM-11/ZSM-5 composite molecular screen
Structure cell and impurity structure cell.
In the context of the present specification, it is included in embodiment below and comparative example, in composite molecular screen product
The measuring method of ZSM-11 molecular sieve crystal content is：There is different ZSM-11 crystal phases and ZSM-5 using the simulation of DIFFaX software
The powder X-ray RD spectrogram of the ZSM-11/ZSM-5 composite molecular screen of crystal content, will be compound point of ZSM-11/ZSM-5 obtained by embodiment
Son sieves product and is compared to obtain the content of ZSM-11 molecular sieve in composite molecular screen product by the spectrogram that DIFFaX software is simulated.
In the context of the present specification, it is included in embodiment below and comparative example, it is miscellaneous in composite molecular screen product
The measuring method of the content of matter is：Content based on object phase is directly proportional to the X-ray diffraction peak intensity of the object phase, by XRD spectra
In all diffraction maximums peak intensity be added, obtain total I, the characteristic diffraction peak of ZSM-11 and ZSM-5 molecular sieve will be corresponded in spectrogram
Peak intensity be added, obtain total I ', (1-I '/I) × 100% be product in impurity content.
In the case where not clearly indicating, all percentages, number, the ratio etc. being previously mentioned in this specification be all with
On the basis of weight, unless not meeting the conventional understanding of those skilled in the art when using weight as benchmark.
【Embodiment 1】
By sodium aluminate (Al2O343.0 weight %, Na235.0 weight % of O) 18.6 grams, sodium hydroxide (96.0 weight %)
11.9 grams, 1980.0 grams of deionized water, 234.7 grams of 1,3- hexamethylene dimethylamine (99.0 weight %) and silica solution (SiO240.0 weights
Measure %) 825.0 grams be uniformly mixed, the material proportion (molar ratio) of reactant is：
SiO2/Al2O3=70
1,3- hexamethylene dimethylamine/SiO2=0.3
NaOH/SiO2=0.09
H2O/SiO2=25
After mixing, be fitted into stainless steel cauldron, under agitation in 150 DEG C crystallization 3 days.Mistake after crystallization
Filter, washing, drying, then ZSM-11/ZSM-5 composite molecular screen is roasted 5 hours to obtain in 550 DEG C of air.Composite molecular screen product
Middle ZSM-11 molecular sieve content is 94 weight %, and impurity content is 1 weight %.
【Embodiment 2】
Together【Embodiment 1】, only the material proportion (molar ratio) of reactant be：SiO2/Al2O3=70,1,3- hexamethylene diformazan
Amine/SiO2=0.2, NaOH/SiO2=0.15, H2O/SiO2=30,150 DEG C crystallization 72 hours.In composite molecular screen product
ZSM-11 molecular sieve content is 80 weight %, and impurity content is 1 weight %.
【Embodiment 3】
Together【Embodiment 1】, only the material proportion (molar ratio) of reactant be：SiO2/Al2O3=70,1,3- hexamethylene diformazan
Amine/SiO2=0.4, NaOH/SiO2=0.18, H2O/SiO2=25,150 DEG C crystallization 70 hours.In composite molecular screen product
ZSM-11 molecular sieve content is 50 weight %, and impurity content is 0.5 weight %.
【Embodiment 4】
Together【Embodiment 1】, only the material proportion (molar ratio) of reactant be：SiO2/Al2O3=70,1,3- hexamethylene diformazan
Amine/SiO2=0.3, NaOH/SiO2=0.28, H2O/SiO2=25,150 DEG C crystallization 70 hours.In composite molecular screen product
ZSM-11 molecular sieve content is 40 weight %, and impurity content is 2 weight %.
【Embodiment 5】
Together【Embodiment 1】, only the material proportion (molar ratio) of reactant be：SiO2/Al2O3=50,1,3- hexamethylene diformazan
Amine/SiO2=0.3, NaOH/SiO2=0.18, H2O/SiO2=25,150 DEG C crystallization 3 days.ZSM- in composite molecular screen product
11 molecular sieve contents are 79 weight %, and impurity content is 1 weight %.
【Embodiment 6】
Together【Embodiment 1】, only use aluminum sulfate for silicon source, the material proportion (molar ratio) of reactant is：SiO2/Al2O3
=200,1,3- hexamethylene dimethylamine/SiO2=0.2, NaOH/SiO2=0.35, H2O/SiO2=20,150 DEG C crystallization 70 hours.
ZSM-11 molecular sieve content is 65 weight % in composite molecular screen product, and impurity content is 2 weight %.
【Embodiment 7】
Together【Embodiment 6】, only the material proportion (molar ratio) of reactant be：SiO2/Al2O3=80,1,3- hexamethylene diformazan
Amine/SiO2=0.5, NaOH/SiO2=0.6, H2O/SiO2=23,150 DEG C crystallization 60 hours.In composite molecular screen product
ZSM-11 molecular sieve content is 57 weight %, and impurity content is 3 weight %.
【Embodiment 8】
Together【Embodiment 1】, only use aluminum nitrate for silicon source, the material proportion (molar ratio) of reactant is：SiO2/Al2O3
=90,1,3- hexamethylene dimethylamine/SiO2=0.3, NaOH/SiO2=0.19, H2O/SiO2=20,150 DEG C crystallization 70 hours.
ZSM-11 molecular sieve content is 85 weight % in composite molecular screen product, and impurity content is 2 weight %.
【Embodiment 9】
Together【Embodiment 1】, only use Isosorbide-5-Nitrae-hexamethylene dimethylamine for template, the material proportion (molar ratio) of reactant
For：SiO2/Al2O3=70, Isosorbide-5-Nitrae-hexamethylene dimethylamine/SiO2=0.3, NaOH/SiO2=0.14, H2O/SiO2=20, at 150 DEG C
Crystallization 72 hours.ZSM-11 molecular sieve content is 74 weight % in composite molecular screen product, and impurity content is 1 weight %.
【Embodiment 10】
Together【Embodiment 1】, it is only template using 1,3- hexamethylene dimethylamine and Isosorbide-5-Nitrae-hexamethylene dimethylamine mixture, instead
The material proportion (molar ratio) for answering object is：SiO2/Al2O3=70,1,3- hexamethylene dimethylamine/SiO2=0.2, Isosorbide-5-Nitrae-hexamethylene diformazan
Amine/SiO2=0.2, NaOH/SiO2=0.20, H2O/SiO2=20,150 DEG C crystallization 36 hours.In composite molecular screen product
ZSM-11 molecular sieve content is 78 weight %, and impurity content is 4 weight %.
Claims (16)
1. a kind of synthetic method of ZSM-11/ZSM-5 composite molecular screen, be included under crystallization condition make silicon source, silicon source, alkali source,
Organic formwork agent and water contact, the step of to obtain molecular sieve；Optionally, the step of roasting the molecular sieve of the acquisition；Its
In, the organic formwork agent R is selected from least one of 1,3- hexamethylene dimethylamine or Isosorbide-5-Nitrae-hexamethylene dimethylamine；
The silicon source, source of aluminium, the alkali source, the organic formwork agent R and water molar ratio be 1：(0.005~0.04)：
(0.05~0.6)：(0.05~1.0)：(10~50)；
The crystallization condition includes：130~190 DEG C of crystallization temperature, crystallization time 1~10 day.
2. the synthetic method of ZSM-11/ZSM-5 composite molecular screen according to claim 1, which is characterized in that the roasting
Condition includes：300~800 DEG C of maturing temperature, calcining time 1~10 hour, calcination atmosphere was air or oxygen；
The silicon source in silicic acid, silica gel, silica solution, silicic acid tetraalkyl ester, sodium metasilicate, waterglass or white carbon black at least one
Kind；Source of aluminium is selected from least one of aluminium hydroxide, sodium aluminate, aluminium alcoholates, aluminum nitrate, aluminum sulfate, kaolin or montmorillonite；
It is cationic alkali that the alkali source, which is selected from alkali or alkaline earth metal,.
3. the synthetic method of ZSM-11/ZSM-5 composite molecular screen according to claim 1, which is characterized in that
The crystallization condition includes：145~175 DEG C of crystallization temperature, crystallization time 2~10 days；
And the roasting condition includes：400~650 DEG C of maturing temperature, calcining time 3~6 hours；
The silicon source is selected from least one of silicic acid, silica gel, silica solution or silicic acid tetraalkyl ester；Source of aluminium is selected from hydroxide
At least one of aluminium, sodium aluminate or aluminum nitrate；The alkali source is selected from sodium hydroxide.
4. the synthetic method of ZSM-11/ZSM-5 composite molecular screen according to claim 1, which is characterized in that the silicon
Source, source of aluminium, the alkali source, the organic formwork agent R and water molar ratio be 1：(0.003~0.025)：(0.09~
0.5)：(0.08~0.8)：(12~50).
5. the synthetic method of ZSM-11/ZSM-5 composite molecular screen according to claim 1, which is characterized in that heating method
Using direct-fired mode, perhaps by the way of microwave heating or using the composite square directly heated with microwave heating
Formula.
6. the ZSM-11/ZSM-5 composite molecular screen of any the method synthesis of Claims 1 to 5, which is characterized in that described multiple
It closes in molecular sieve, the content of ZSM-11 crystal phase is not less than 30 weight %；
Wherein, impurity is contained in the composite molecular screen, impurity content is not higher than 10 weight %；The impurity is selected from unformed
SiO2, at least one molecular sieve different from ZSM-11 and ZSM-5, metal oxide, quartz, tridymite, in cristobalite extremely
Few one kind.
7. ZSM-11/ZSM-5 composite molecular screen according to claim 6, it is characterised in that the content of ZSM-11 crystal phase is not
Lower than 45 weight %.
8. ZSM-11/ZSM-5 composite molecular screen according to claim 6, it is characterised in that the content of ZSM-11 crystal phase is not
Lower than 60 weight %.
9. ZSM-11/ZSM-5 composite molecular screen according to claim 6, it is characterised in that the content of ZSM-11 crystal phase is not
Lower than 75 weight %.
10. ZSM-11/ZSM-5 composite molecular screen according to claim 6, it is characterised in that the content of ZSM-11 crystal phase is not
Lower than 90 weight %.
11. ZSM-11/ZSM-5 composite molecular screen according to claim 6, which is characterized in that in the composite molecular screen
Impurity content be not higher than 5 weight %.
12. ZSM-11/ZSM-5 composite molecular screen according to claim 11, which is characterized in that in the composite molecular screen
Impurity content be not higher than 3 weight %.
13. ZSM-11/ZSM-5 composite molecular screen according to claim 6, which is characterized in that the impurity is selected from without fixed
Type SiO2, ZSM-23, ZSM-22, Beta, MCM-22, MOR, Y type, X-type, at least one of A type molecular sieve.
14. ZSM-11/ZSM-5 composite molecular screen according to claim 13, which is characterized in that the impurity is selected from without fixed
Type SiO2, at least one of MOR.
15. according to any ZSM-11/ZSM-5 composite molecular screen of claim 6~14, which is characterized in that described compound
In molecular sieve, the existence form of ZSM-11/ZSM-5 composite molecular screen and impurity includes physical mixed, at least one in cocrystallization
Kind.
16. ZSM-11/ZSM-5 composite molecular screen according to claim 15, which is characterized in that the impurity be content not
Higher than the unformed SiO of 10 weight %2。
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| US4108881A (en) * | 1977-08-01 | 1978-08-22 | Mobil Oil Corporation | Synthesis of zeolite ZSM-11 |
| US5645812A (en) * | 1993-10-01 | 1997-07-08 | Chevron U.S.A. Inc. | Zeolite ZSM-11 and a process for preparing zeolite ZSM-11 using a 3,5-dimethylpiperidinium templating agent |
| CN1240193A (en) * | 1999-04-21 | 2000-01-05 | 中国石油化工集团公司 | Ultrafine granule five-element circular type zeolite |
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| CN103848437A (en) * | 2012-12-03 | 2014-06-11 | 中国石油大学(华东) | Preparation method of ZSM-5 molecular sieve |
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| CN103539153B (en) * | 2012-07-12 | 2015-11-18 | 中国石油化工股份有限公司 | The preparation method of nanometer hierarchical pore ZSM-11/ZSM-5 eutectic zeolite |
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| US4108881A (en) * | 1977-08-01 | 1978-08-22 | Mobil Oil Corporation | Synthesis of zeolite ZSM-11 |
| US5645812A (en) * | 1993-10-01 | 1997-07-08 | Chevron U.S.A. Inc. | Zeolite ZSM-11 and a process for preparing zeolite ZSM-11 using a 3,5-dimethylpiperidinium templating agent |
| CN1240193A (en) * | 1999-04-21 | 2000-01-05 | 中国石油化工集团公司 | Ultrafine granule five-element circular type zeolite |
| CN1367758A (en) * | 1999-07-13 | 2002-09-04 | 美孚石油公司 | Synthesis of ZSM-5 and ZSM-11 |
| CN103848437A (en) * | 2012-12-03 | 2014-06-11 | 中国石油大学(华东) | Preparation method of ZSM-5 molecular sieve |
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