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A kind of preparation method of izm-2 molecular sieve

A technology of molecular sieves and cations, applied in the direction of molecular sieve catalysts, molecular sieves and base exchange compounds, chemical instruments and methods, etc., can solve the problems of zeolite molecular sieve agglomeration, etc., and achieve the improvement of particle aggregation, selectivity and isomer yield. Effect

Active Publication Date: 2019-04-23
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Mainly solve the technical problem that the zeolite molecular sieve synthesized in the prior art is prone to agglomeration

Method used

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  • A kind of preparation method of izm-2 molecular sieve
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  • A kind of preparation method of izm-2 molecular sieve

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Experimental program
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Effect test

Embodiment 1

[0026] Embodiment 1: the preparation of IZM-2 molecular sieve sample

[0027] Add 0.202g of aluminum isopropoxide, 1.58g of sodium hydroxide, and 23.34g of silica sol to 70g of deionized water in sequence, stir evenly, and add 5.29g of template agent (1,6-dimethylpiperidine hexane) to the above mixed solution In, stir well until gelled. The reaction mixture was put into a polytetrafluoroethylene-lined stainless steel reactor, crystallized at 170°C for 7 days, the reaction product was washed 3 times with deionized water, then washed 3 times with ethanol solution, and dried at 80°C More than 12h, the final product is obtained. The chemical molar ratio of each component in the reaction system is as follows: 60SiO 2 : 0.25Al 2 o 3 : 10Na 2 O: 10R: 2000H 2 O. wherein R refers to 1,6-dimethylpiperidine hexane.

[0028] attached figure 1 The XRD characterization results of the IZM-2 molecular sieve prepared for Example 1.

[0029] attached figure 2 Scanning electron micro...

Embodiment 2

[0030] Embodiment 2: add CTAC cationic surfactant to prepare IZM-2 molecular sieve

[0031] Add 0.202g of aluminum isopropoxide, 1.58g of sodium hydroxide, 23.34g of silica sol, and 5.29g of templating agent (1,6-dimethylpiperidine hexane) into 70g of deionized water in sequence, stir well, and then add 1.87g Cetyltrimethylammonium chloride was added to the above mixed solution until the mixture was evenly stirred to form a gel. The reaction mixture was put into a polytetrafluoroethylene-lined stainless steel reactor, crystallized at 170°C for 7 days, the reaction product was washed 3 times with deionized water, and washed 3 times with ethanol solution, and heated at 80°C After drying for more than 12 hours, the final product is obtained. The chemical molar ratio of each component in the reaction system is as follows: 60SiO 2 : 0.25Al 2 o 3 : 10Na 2 O: 10R: 2000H 2 O: 0.05CTAC, wherein R is the templating agent 1,6-dimethylpiperidine hexane, and CTAC is the cationic surf...

Embodiment 3

[0036] Embodiment 3: the catalytic performance evaluation of the prepared IZM-2 molecular sieve

[0037] The hydroisomerization reaction of n-dodecane was used as a model to evaluate the catalytic performance of the prepared IZM-2 molecular sieve as a catalyst carrier. The catalyst in this reaction was 0.5wt% Pt / IZM-2. The reaction is carried out in a micro-fixed-bed reactor with stainless steel tubes at atmospheric pressure. The inner diameter of the reaction tube is 10mm, and the loading amount of the catalyst is 3g (20-40 mesh). Mix evenly and fill in the middle of the reaction tube. Both ends of the catalyst bed are filled with 20-40 mesh quartz sand, WHSV=1-1 , reaction pressure P=4.5Mpa, n(H 2 ) / n(n-C12)=15(mol / mol), H 2 The gas flow rate is 98.5ml / min, and the reaction is sampled every hour, and the sample of the third hour at each temperature point is analyzed by gas chromatography. The conversion rate of n-dodecane was controlled by changing the reaction temperatur...

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Abstract

The invention discloses a preparation method of an IZM-2 molecular sieve. The method comprises the steps of sequentially adding an aluminum source, a sodium source, a silicon source, a template agent and an anionic surfactant into deionized water, uniformly mixing and stirring to obtain a gel-like mixture, putting the mixture into a stainless steel reaction still with a polytetrafluoroethylene lining, carrying out crystallization reaction for 3 to 15 days under the condition of 160 to 200 DEG C, fully washing a reaction product with deionized water, and drying to obtain a final product. According to the preparation method provided by the invention, the surfactant is added in a reaction system, and the composition of components in the reaction system and other reaction parameter conditions are strictly controlled, so that the prepared IZM-2 molecular sieve is remarkably improved in particle cluster situation, and improved in hydroisomerization selectivity and isomer yield.

Description

technical field [0001] The invention belongs to the technical field of preparation of zeolite molecular sieves, and in particular relates to a preparation method of IZM-2 molecular sieves. Background technique [0002] Since zeolite was first synthesized in 1949, zeolite science and technology have developed considerably and have been widely used. In today's society, zeolite molecular sieve catalytic technology plays an increasingly important role in the fields of petroleum refining, petrochemical industry and environmental protection. Generations of scientists have continuously discovered new types of zeolites, and there have been 206 zeolite structure types to date. A molecular sieve with a new structure can be designed by systematically changing the synthesis parameters of the molecular sieve. To design and synthesize a molecular sieve, its internal parameters (pore structure, acid strength) and its external parameters (particle size) must be considered. [0003] In the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/48B01J32/00B01J29/70
CPCB01J29/70C01B39/48C01P2002/72C01P2004/03
Inventor 杜燕燕李传松李久盛
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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