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IM-5 molecular sieve synthesis method

An IM-5, molecular sieve technology, applied in the direction of crystalline aluminosilicate zeolite, can solve the problems of low utilization rate of active centers, large diffusion resistance of large particle size molecular sieves, easy deactivation, etc., to shorten the crystallization time and reduce impurities. The formation of crystal phase, the effect of promoting depolymerization

Active Publication Date: 2014-04-09
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the catalytic reaction, the diffusion resistance of the large particle size molecular sieve is large, the utilization rate of the active center is low, and it is easy to deactivate

Method used

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  • IM-5 molecular sieve synthesis method

Examples

Experimental program
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Effect test

Embodiment 1

[0066] According to the method of comparative example 3, sodium metaaluminate (NaAlO 2 ) solution, 2.00g NaAlO 2solution, 1.27g NaOH, 0.26g MP solution and 2.74g MPPBr solution were dissolved in an appropriate amount of deionized water, mixed evenly, under the condition of stirring, 6.51g of solid coarse-pore silica gel particles were added, and stirred evenly. The molar composition of the reaction mixture is SiO 2 :Al 2 o 3 : Na 2 O: R: A: H 2 O=60:1:11.4:6:1.8:600. Transfer the prepared colloid to a 50ml polytetrafluoroethylene-lined autoclave, rotate and crystallize at 160°C for 6 days, stop the crystallization reaction, wash and filter the product, and dry it at 80°C to obtain IM -5 molecular sieves. The XRD diffraction pattern of the obtained sample is shown in the attached image 3 As shown, the scanning electron microscope spectrum is shown as Figure 6 shown.

Embodiment 2

[0068] According to the method of comparative example 3, sodium metaaluminate (NaAlO 2 ) solution, 2.00g NaAlO 2 solution, 0.75g NaOH, 3.04g MPPOH solution and 6.84g MPPBr solution were dissolved in an appropriate amount of deionized water, mixed evenly, and under stirring conditions, 6.51g of solid coarse-pore silica gel particles were added, and stirred evenly. The molar composition of the reaction mixture is SiO 2 :Al 2 o 3 : Na 2 O: R: A: H 2 O=60:1:7.5:4.5:3:600. Transfer the obtained colloid to a 50ml polytetrafluoroethylene-lined autoclave, crystallize at 140°C for 1 day, crystallize at 160°C for 5 days, stop the crystallization reaction, and wash and filter the product, then store it at 80°C After drying, IM-5 molecular sieve can be obtained. The XRD diffraction pattern of the obtained sample is shown in the attached Figure 4 shown.

Embodiment 3

[0070] 1.67g Al(NO 3 ) 3 9H 2 0. Dissolve 1.60g NaOH, 13.70g MPPBr solution and 0.26g MP solution in an appropriate amount of deionized water, mix well, and add 6.51g of solid coarse-pore silica gel particles under stirring conditions, and stir well. The molar composition of the reaction mixture is: SiO 2 :Al 2 o 3 : Na 2 O: R: A: H 2 O=60:2:12:9:1.8:600. The prepared colloid was transferred to a 50ml polytetrafluoroethylene-lined autoclave, crystallized at 160°C for 1 day, crystallized at 175°C for 5 days, stopped the crystallization reaction, and the product was washed and filtered for 80 ℃ drying overnight to obtain IM-5 molecular sieve.

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Abstract

An IM-5 molecular sieve synthesis method comprises the following steps: 1, dissolving an inorganic alkali, an aluminum source and a template in deionized water, and uniformly mixing to prepare a mixed solution; 2, adding a solid silica gel to the mixed solution obtained in step 1, adding a template precursor, and uniformly mixing to prepare a colloid or a solid-liquid mixture; and 3, transferring the colloid or solid-liquid mixture obtained in step 2 to a crystallization kettle, carrying out hydrothermal crystallization for 1-10 days, cooling after the crystallization to obtain a mixed liquid, and washing, filtering and drying the mixed liquid to obtain raw IM-5 molecular sieve powder, wherein reactants comprise SiO2, Al2O3, M2O, R, A and H2O, a molar ratio of SiO2:Al2O3:M2O:R:A:H2O is 60:(0.3-6):(6-20):(4-15):(1.2-6):(300-1200), M2O is an alkali metal oxide, R is the template, and A is the template precursor. The IM-5 molecular sieve synthesis method has the advantages of good product repeatability, effective reduction of the water content, increase of the concentration of the template, crystallization time shortening and single kettle yield increase.

Description

technical field [0001] The invention relates to a method for synthesizing molecular sieves, more specifically, a method for synthesizing IM-5 molecular sieves. Background technique [0002] Molecular sieves are playing an increasingly important role in the petrochemical industry. With the development of petrochemical and fine chemical industries, the requirements for environmental protection in the production process are becoming increasingly stringent, and the demand for new catalytic materials is also increasing. Among them, ten-membered ring molecular sieves are widely used in the field of shape-selective catalysis due to their unique pore size and pore structure. In 1997, French Petroleum Company (IFP) successfully synthesized IM-5 molecular sieve. The molecular sieve has a two-dimensional ten-membered ring channel system and limited short channels in the third dimension. Its channel system is very similar to ZSM-5 molecular sieve. Formality. WO98 / 17581A1 disclosed I...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/04
Inventor 张超陈俊文王永睿贾晓梅慕旭宏舒兴田
Owner CHINA PETROLEUM & CHEM CORP
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