CN107140657B - A kind of preparation method of IZM-2 molecular sieve - Google Patents
A kind of preparation method of IZM-2 molecular sieve Download PDFInfo
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- CN107140657B CN107140657B CN201710516461.8A CN201710516461A CN107140657B CN 107140657 B CN107140657 B CN 107140657B CN 201710516461 A CN201710516461 A CN 201710516461A CN 107140657 B CN107140657 B CN 107140657B
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B39/00—Compounds having molecular sieve and base-exchange properties, e.g. crystalline zeolites; Their preparation; After-treatment, e.g. ion-exchange or dealumination
- C01B39/02—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof; Direct preparation thereof; Preparation thereof starting from a reaction mixture containing a crystalline zeolite of another type, or from preformed reactants; After-treatment thereof
- C01B39/46—Other types characterised by their X-ray diffraction pattern and their defined composition
- C01B39/48—Other types characterised by their X-ray diffraction pattern and their defined composition using at least one organic template directing agent
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J29/00—Catalysts comprising molecular sieves
- B01J29/04—Catalysts comprising molecular sieves having base-exchange properties, e.g. crystalline zeolites
- B01J29/06—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof
- B01J29/70—Crystalline aluminosilicate zeolites; Isomorphous compounds thereof of types characterised by their specific structure not provided for in groups B01J29/08 - B01J29/65
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- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2002/00—Crystal-structural characteristics
- C01P2002/70—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data
- C01P2002/72—Crystal-structural characteristics defined by measured X-ray, neutron or electron diffraction data by d-values or two theta-values, e.g. as X-ray diagram
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- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01P—INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS
- C01P2004/00—Particle morphology
- C01P2004/01—Particle morphology depicted by an image
- C01P2004/03—Particle morphology depicted by an image obtained by SEM
Abstract
The invention discloses a kind of preparation methods of IZM-2 molecular sieve.This method are as follows: by silicon source, sodium source, silicon source, template and cationic surfactant sequentially add in deionized water, are mixed evenly until gelled mixture, is put into later in the stainless steel cauldron with polytetrafluoroethyllining lining, it is carried out crystallization 3~15 days under the conditions of 160~200 DEG C, it is dry after reaction product is sufficiently washed with deionized water, obtain final products.Preparation method of the invention by being added surfactant in the reaction system, and the composition of each component and other response parameter conditions in strict control reaction system, so that IZM-2 molecular sieve its particle aggregation situation of preparation be improved significantly, and the selectivity of its hydroisomerization and isomers yield are also improved.
Description
Technical field
The invention belongs to technical field of zeolite molecular sieve preparation, and in particular to a kind of preparation method of IZM-2 molecular sieve.
Background technique
Since zeolite in 1949 by since synthesizing for the first time, Zeolite Science and technology have had significant progress and extensively
Application.Today's society, Zeolite molecular sieve catalysis technology play more next in Petroleum refining, petrochemical industry and field of environment protection
More important role.Scientists from one generation to the next have constantly discovered new zeolite type, have there is 206 kinds of boilings so far
Stone structure type.A kind of new structural molecular sieve can be designed by the synthetic parameters of the change molecular sieve of system, is designed
Synthesis of molecular sieve will consider its inner parameter (pore structure, acid strength) and its external parameter (particle size).
In catalytic field, silicoaluminophosphamolecular molecular sieves and Si-Al molecular sieve with mesoporous one-dimensional tubulose obtain this respect
Extensive research, wherein typically have SAPO-11, SAPO-31, SAPO-41 and ZSM-22, ZSM-23, ZSM-48.These points
Son sieve material all shows relatively good catalytic activity and isomer selective in hydroisomerization reaction.
Patent US 8361435B2 reports the preparation method of novel molecular sieve IZM-2 a kind of, patent US8629073B2
Also novel molecular sieve IZM-2 is reported, and has rated the Hydroisomerization Properties of the molecular sieve.Its particle size reaches
Nano grade, in long-chain normal paraffin hydroisomerization, IZM-2 novel molecular sieve base catalyst shows excellent catalysis
Activity and selectivity.But in current research report, there are no the precise structure about the molecular sieve, and existing skill
The zeolite molecular sieve that hydro-thermal method synthesizes in art is easy to happen reunion.
Summary of the invention
It is an object of the present invention to provide a kind of preparation methods of IZM-2 molecular sieve.It mainly solves to synthesize in the prior art
Zeolite molecular sieve is easy to happen the technical issues of reunion.
Used technical solution is as follows to solve above-mentioned technical problem by the present invention:
A kind of preparation method of IZM-2 molecular sieve, this method are as follows: by silicon source, sodium source, silicon source, template and cation form
Face activating agent sequentially adds in deionized water, is mixed evenly until gelled mixture, is put into later with polytetrafluoro
In the stainless steel cauldron of ethylene liner, carried out crystallization 3~15 days under the conditions of 160~200 DEG C, reaction product spend from
It is dry after sub- water sufficiently washs, obtain final products.
Preferably, source of aluminium is aluminium isopropoxide or boehmite, and the sodium source is sodium hydroxide, and the silicon source is silicon
Sol solution.
Preferably, the template is the bis- methyl piperidine hexanes of 1,6-.The preparation side of the bis- methyl piperidine hexanes of 1,6-
Method are as follows: 1,6- dibromo-hexane and N- methyl piperidine with 2~4 ratios in alcohol solvent in 70~90 DEG C under the conditions of reflux 10~
The bis- methyl piperidine hexanes of 1,6- are made in 15h.
Preferably, the cationic surfactant is hexadecyltrimethylammonium chloride (hereinafter referred to as CTAC).
Preferably, source of aluminium, sodium source, silicon source, template, cationic surfactant and deionized water are in reactant
The mol ratio of each component is in system: 0.1~0.4Al2O3: 5~15Na2O:45~70SiO2: 5~15R:0.005~
0.05CTAC:1500~2200H2O, wherein R is template 1, and the bis- methyl piperidine hexanes of 6-, CTAC is cationic surfactant
Hexadecyltrimethylammonium chloride.
Preferably, it is 10-15 hours dry at 70-90 DEG C after the reaction product is sufficiently washed with deionized water.
Compared with prior art, beneficial effects of the present invention are as follows:
1, preparation method of the invention is strictly controlled by the way that cationic surfactant CTAC is added in the reaction system
The composition of each component and other response parameter conditions in reaction system processed make the particle aggregation feelings of the IZM-2 molecular sieve of preparation
Condition be improved significantly, and the selectivity of its hydroisomerization and isomers yield are improved.
2, inventor passes through research discovery: cationicsurfactants are added in preparation method, it can not
Making the particle aggregation situation of IZM-2 molecular sieve is improved.Molecule is then obviously improved after cationic surfactant CTAC is added
The particle aggregation situation of sieve.
Detailed description of the invention
Fig. 1 is the XRD spectra for the IZM-2 molecular sieve that the embodiment of the present invention 1 prepares.
Fig. 2 is the SEM picture for the IZM-2 molecular sieve that the embodiment of the present invention 1 prepares.
Fig. 3 is the XRD that the embodiment of the present invention 2 adds the IZM-2 molecular sieve that CTAC cationic surfactant prepares
Spectrogram.
Fig. 4 is the SEM that the embodiment of the present invention 2 adds the IZM-2 molecular sieve that CTAC cationic surfactant prepares
Picture.
Fig. 5 is IZM-2 molecular sieve and adds adding for IZM-2 molecular sieve catalyst prepared by CTAC cationic surfactant
Hydrogen heterogeneous activity comparison diagram.
Fig. 6 is IZM-2 molecular sieve and adds adding for IZM-2 molecular sieve catalyst prepared by CTAC cationic surfactant
Hydrogen stereoselectivity comparison diagram.
Fig. 7 is IZM-2 molecular sieve and adds adding for IZM-2 molecular sieve catalyst prepared by CTAC cationic surfactant
Hydrogen isomery yield comparison diagram.
Specific embodiment
Technical solution of the present invention is described in detail below with reference to embodiment.
The synthesis of the bis- methyl piperidine hexanes of template 1,6-
The N- methyl piperidine of 19.834g is slowly added into the ethanol solution of 1,6- dibromo-hexane of 24.397g, 90 DEG C of items
Flow back 12h under part, is cooled to room temperature later, and crystallization about 3-4h, is filtered later under the conditions of -18 DEG C, washing, does under the conditions of 50 DEG C
Dry 12h, obtains final product.
The preparation of embodiment 1:IZM-2 sieve sample
By 0.202g aluminium isopropoxide, 1.58g sodium hydroxide, 23.34g silica solution is sequentially added in 70g deionized water, stirring
Uniformly, 5.29g template (1,6- bis- methyl piperidine hexanes) are added in above-mentioned mixed solution, are stirred evenly until at gel.
Reaction mixture is packed into the stainless steel cauldron of polytetrafluoroethyllining lining, crystallization 7 days under the conditions of 170 DEG C, by reaction product
It is washed with deionized 3 times, then is washed 3 times with ethanol solution, and in 80 DEG C of dry 12h or more, obtain final products.The reaction
The chemical mol ratio of each component is as follows in system: 60SiO2: 0.25Al2O3: 10Na2O:10R:2000H2O.Wherein R refers to 1,
The bis- methyl piperidine hexanes of 6-.
Attached drawing 1 is the XRD characterization result that IZM-2 molecular sieve is made in embodiment 1.
Attached drawing 2 is the stereoscan photograph that IZM-2 molecular sieve is made in embodiment 1.
Embodiment 2: addition CTAC cationic surfactant prepares IZM-2 molecular sieve
By 0.202g aluminium isopropoxide, 1.58g sodium hydroxide, 23.34g silica solution, 5.29g template (1,6- bis- methyl piperazines
Pyridine hexane) it sequentially adds in 70g deionized water, it stirs evenly, then above-mentioned mix is added in 1.87g hexadecyltrimethylammonium chloride
It closes in solution, until stirring evenly to form gel.Reaction mixture is fitted into the stainless steel cauldron of polytetrafluoroethyllining lining,
Reaction product is washed with deionized 3 times for crystallization 7 days under the conditions of 170 DEG C, then is washed 3 times with ethanol solution, and at 80 DEG C
Dry 12h or more, obtains final products.The chemical mol ratio of each component is as follows in the reaction system: 60SiO2:
0.25Al2O3: 10Na2O:10R:2000H2O:0.05CTAC, wherein R is template 1, and the bis- methyl piperidine hexanes of 6-, CTAC is sun
Ionic surface active agent hexadecyltrimethylammonium chloride.
Attached drawing 3 is the XRD characterization that embodiment 2 adds the IZM-2 molecular sieve that CTAC cationic surfactant prepares
As a result.
Attached drawing 4 is the scanning electron microscope that embodiment 2 adds the IZM-2 molecular sieve that CTAC cationic surfactant prepares
Photo.
Attached drawing 1 and Fig. 2 be the IZM-2 molecular sieve obtained in embodiment 1 with conventional hydrothermal synthetic method XRD spectra and
SEM picture.As can be seen from Figure 2: the IZM-2 molecular sieve microscopic appearance that conventional hydrothermal synthetic method obtains is a large amount of nanometer ruler
The random reunion of very little particle is together.This concentration effect may block the duct of IZM-2 molecular sieve and inhibit object
Diffusion of the molecule in duct, to limit its further practical application.
Attached drawing 3 and Fig. 4 are the IZM-2 molecular sieves for adding CTAC cationic surfactant in embodiment 2 and preparing
XRD spectra and SEM picture.As can be seen from Figure 3: after being added to cationic surfactant CTAC, there is no change IZM-2 points
The structure and crystalline form of son sieve, only diffraction peak intensity corresponding to each 2 θ of the angle of diffraction slightly reduces.As can be seen from Figure 4: adding
After having added cationic surfactant CTAC, the particle aggregation effect of IZM-2 molecular sieve has apparent improvement, and particle size
And it has not been changed.
Embodiment 3: the catalytic performance test of the IZM-2 molecular sieve of preparation
Using the hydroisomerization reaction of n-dodecane as model, the IZM-2 molecular sieve of preparation is evaluated as catalyst
The catalytic performance of carrier, the catalyst in the reaction are 0.5wt%Pt/IZM-2.Reaction is in the miniature fixed bed of normal pressure stainless steel tube
Carried out on reactor, tube inner diameter is 10mm, loaded catalyst 3g (20-40 mesh), while also with catalyst about etc.
The quartz sand (20-40 mesh) and catalyst of volume are seated in the middle-end of reaction tube after evenly mixing.The both ends of catalyst bed fill
Fill out the quartz sand of 20-40 mesh, WHSV=1-1, reaction pressure P=4.5Mpa, n (H2)/n (n-C12)=15 (mol/mol), H2Gas
Flow 98.5ml/min, reaction carry out gas phase per a sample is taken every other hour, to the sample of the third hour of each temperature spot
Chromatograph analysis.The conversion ratio of n-dodecane is controlled by changing reaction temperature.Procatalyst is reacted in 400 DEG C, H2(100ml/
Min 4h is restored in).
Attached drawing 5 is that IZM-2 molecular sieve and addition CTAC cationic surfactant are evaluated with dodecane hydrocarbon hydroisomerizing
The result of IZM-2 activity of molecular sieve catalysts.Should the result shows that: the IZM-2 molecular sieve based catalyst after being added to CTAC is reaching
To under conversion ratio identical with the IZM-2 molecular sieve based catalyst of CTAC is not added, reaction temperature required for the former is higher, greatly
It is approximately higher than 40 DEG C or so of the latter；And two kinds of catalyst can reach 98% or so dodecane hydrocarbon conversion rate, illustrate to add
There is no big variations for IZM-2 molecular sieve after CTAC acid.
Attached drawing 6 is that IZM-2 molecular sieve and addition CTAC cationic surfactant are evaluated with dodecane hydrocarbon hydroisomerizing
The result of IZM-2 molecular sieve catalyst selectivity.The evaluation result shows: the IZM-2 molecular screen base catalysis after being added to CTAC
Although agent reaction temperature improves 40 DEG C or so, the isomerisation selectivity of its dodecane hydrocarbon has apparent raising；With
The raising of reaction temperature, do not add the IZM-2 molecular sieve based catalyst of CTAC selectivity reduce speed quickly, illustrate this
The metal of catalyst adds hydrogen dehydrogenation functionality quickly to reduce as temperature increases, and has gradually lost precious metals pt and IZM-2 divides
The acid balance synergistic effect that son sieve provides；IZM-2 molecular sieve based catalyst after being added to CTAC is in origin temp (260
DEG C) selectivity than the former catalyst taller 14 percentage points in the selectivity of the temperature spot, as the IZM-2 for not adding CTAC
When molecular sieve based catalyst hydroisomerizing selectively reaches minimum value 2.3% (290 DEG C), the selectivity of the latter at this time is still very
Height has reached 81%；With the raising of reaction temperature, the speed that the IZM-2 molecular sieve based catalyst of CTAC selectively declines is added
Degree is slower than the former, illustrates after being added to CTAC, effectively inhibits the dehydrogenation metal hydrogenating function of IZM-2 molecular sieve based catalyst
Inactivation, while also improving synergistic effect acid provided by precious metals pt and IZM-2 molecular sieve carrier.
Attached drawing 7 is that IZM-2 molecular sieve and addition CTAC cationic surfactant are evaluated with dodecane hydrocarbon hydroisomerizing
The result of IZM-2 molecular sieve catalyst isomers yield.This is the result shows that add the different of the IZM-2 molecular sieve based catalyst of CTAC
Structure body yield increases because the isomers yield of isomerization reaction be alkane conversion multiplied by isomer selective as a result,
So isomer selective improves in the case where alkane conversion is roughly the same, isomers yield is also just correspondinglyd increase.
It above are only part preferred embodiment of the invention, the present invention is not limited in the content of embodiment.For ability
For technical staff in domain, can there are various change and change in the conception range of technical solution of the present invention, made
What changes and change, within that scope of the present invention.
Claims (4)
1. a kind of preparation method of IZM-2 molecular sieve, this method are as follows: by silicon source, sodium source, silicon source, template and cationic surface
Activating agent sequentially adds in deionized water, is mixed evenly until gelled mixture, is put into later with polytetrafluoroethyl-ne
In the stainless steel cauldron of alkene liner, carried out crystallization 3~15 days under the conditions of 160~200 DEG C, reaction product deionization
It is dry after water sufficiently washs, obtain final products；Source of aluminium, sodium source, silicon source, template, cationic surfactant and
The mol ratio of deionized water each component in the reaction system is: 0.1~0.4Al2O3: 5~15Na2O:45~70SiO2: 5~
15R:0.005~0.05CTAC:1500~2200H2O, wherein R is template 1, the bis- methyl piperidine hexanes of 6-, CTAC be sun from
Sublist face lammonium ammonium chloride.
2. a kind of preparation method of IZM-2 molecular sieve as described in claim 1, it is characterised in that: source of aluminium is isopropanol
Aluminium or boehmite, the sodium source are sodium hydroxides, and the silicon source is silica solution.
3. a kind of preparation method of IZM-2 molecular sieve as described in claim 1, which is characterized in that the bis- methyl piperazines of 1,6-
Pyridine hexane the preparation method comprises the following steps: 1,6- dibromo-hexane and N- methyl piperidine with the ratio of 2:1~4:1 in alcohol solvent, in 70
Flow back 10~15h under the conditions of~90 DEG C, and the bis- methyl piperidine hexanes of 1,6- are made.
4. a kind of preparation method of IZM-2 molecular sieve as described in claim 1, it is characterised in that: the reaction product is spent
It is 10-15 hours dry at 70-90 DEG C after ionized water sufficiently washs, obtain final products.
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| FR2934796B1 (en) * | 2008-08-08 | 2010-09-03 | Inst Francais Du Petrole | IZM-2 ZEOLITE CATALYST AND METHOD FOR HYDROCONVERSION / HYDROCRACKING HYDROCARBON LOADS |
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