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Method for ionothermal synthesis of SAPO-31 molecular sieve nanorod

A SAPO-31, ionothermal synthesis technology, applied in molecular sieve and alkali-exchanged phosphate, molecular sieve characteristic silicoaluminophosphate, nanotechnology and other directions, can solve the problems of large amount of solvent, difficult recycling and reuse, etc., to reduce waste liquid The effect of emissions

Inactive Publication Date: 2015-05-13
HEILONGJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the technical problem that the existing method of preparing SAPO-31 molecular sieves uses water or organic solvents to make the reaction process under pressure, and the amount of solvents is large, and it is difficult to recycle and reuse technical problems. Method for thermally synthesizing SAPO-31 molecular sieve nanorods

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  • Method for ionothermal synthesis of SAPO-31 molecular sieve nanorod

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specific Embodiment approach 1

[0026] Specific embodiment one: the method of the method for ion thermal synthesis of SAPO-31 molecular sieve nanorods in this embodiment is as follows:

[0027] 1. Preparation of mixed gel:

[0028] a. Weigh the di-n-butylamine whose mass fraction is 95%, and decompose the gained Al 2 o 3 Aluminum isopropoxide with a mass fraction of 24.8% of aluminum isopropoxide, phosphoric acid with a mass fraction of 85%, SiO 2 25.9% silica sol and 1-ethyl-3-methylimidazole bromide;

[0029] b. Heat the 1-ethyl-3-methyl imidazole bromide weighed in step a to a molten state at 70-100°C;

[0030] c. Add the phosphoric acid with a mass fraction of 85% weighed in step a into the molten 1-ethyl-3-methyl imidazole bromide, and stir at a speed of 400-600r / min for 5-15min to obtain mixture A;

[0031] d, aluminum isopropoxide, SiO taken by weighing in step a 2 Silica sol with a content of 25.9% and di-n-butylamine were sequentially added to the mixture A, and stirred at a speed of 1000-1200...

specific Embodiment approach 2

[0038] Specific embodiment 2: The difference between this embodiment and specific embodiment 1 is that the silicon source described in step 1 uses SiO 2 The silicon aerosol content is 100%, and the mass ratio of phosphoric acid to silicon aerosol is 1:(0.04-0.16). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0039] Embodiment 3: This embodiment differs from Embodiment 1 to Embodiment 2 in that in step 2, crystallization is carried out at a temperature of 180-185° C. for 48-50 hours. Others are the same as one of the specific embodiments 1 to 2.

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Abstract

The invention discloses a method for ionothermal synthesis of an SAPO-31 molecular sieve nanorod, and relates to a method for synthesizing a molecular sieve, and the method is used for solving the technical problems that the SAPO-31 molecular sieve prepared by an existing method utilizes water or an organic solvent, so that the reaction process is carried out under pressure, the amount of the solvent is relatively large, and the solvent is difficult to recover and repeatedly use. The method comprises the following steps: 1, preparing mixed gel; and 2, crystallizing and roasting to obtain an SAPO-31 molecular sieve nanorod aggregate. The vapor pressure of the ionic liquid used by the method is zero even if at a molecular sieve crystallization temperature, so that the crystallization process of the molecular sieve can be carried out at an ordinary pressure when the ionic liquid is taken as a crystallization medium; the ionic liquid can be recovered and repeatedly used after molecular sieve synthesis is finished; and waste liquid emission is effectively reduced. The method belongs to the field of preparation of the molecular sieve.

Description

technical field [0001] The invention relates to a method for synthesizing nanorods. Background technique [0002] The SAPO-31 molecular sieve with circular one-dimensional non-intersecting straight channels of ATO topology not only has a suitable pore structure and size (0.54nm×0.54nm), but also has relatively mild acidity. The bifunctional catalyst prepared by supporting metals has high reactivity and high isomerization selectivity for the hydroisomerization reaction of n-paraffins. It has broad application prospects in the process of lubricating oil. Miller et al. used molecular sieves such as SAPO-31 in WO1992001769 in 1992 as acidic carriers for paraffin isomerization; A, K.Sinha et al. -31 and Pt / SAPO-11 catalysts are used in the isomerization reaction of n-hexane. SAPO-31 molecular sieves show excellent catalytic performance as an acidic carrier, and have good application potential in petroleum refining, chemical industry and other fields. [0003] SAPO-31 molecular...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/08C01B39/54B82Y30/00
CPCC01B37/08C01B39/54C01P2002/72C01P2004/03C01P2004/16C01P2004/64
Inventor 吴伟张建伟白雪峰吴会敏肖林飞
Owner HEILONGJIANG UNIV
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