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Method for synthesizing SAPO-31 molecular sieve nanocrystal from double templates

A technology of SAPO-31 and double templating agent, applied in the direction of molecular sieve and alkali exchange phosphate, silicoaluminophosphate with molecular sieve characteristics, nanotechnology, etc., can solve the problem of miscellaneous crystals, long crystallization time and large grain size in products etc. to achieve the effects of fewer structural defects, shorter crystallization time, and higher density of acidic sites

Active Publication Date: 2014-07-02
PETROCHINA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The purpose of the present invention is to provide a method for synthesizing SAPO-31 molecular sieve nanocrystals with double templates, which solves the problems of long crystallization time, large grain size, and miscellaneous crystals in the product that exist in the method for preparing SAPO-31 molecular sieves in the prior art. The problem

Method used

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  • Method for synthesizing SAPO-31 molecular sieve nanocrystal from double templates
  • Method for synthesizing SAPO-31 molecular sieve nanocrystal from double templates
  • Method for synthesizing SAPO-31 molecular sieve nanocrystal from double templates

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Embodiment 1

[0031] The present embodiment provides a method for synthesizing nanometer SAPO-31 molecular sieves with double templates, specifically as follows:

[0032] 1. Preparation of the initial gel: the mass fraction is 85% phosphoric acid solution, the mass fraction is 24.8% aluminum isopropoxide, silica aerosol, the mass fraction is 98.3% di-n-butylamine and the mass fraction is 95% The mixed solution of di-n-propylamine and the HF solution with a mass fraction of 40% were sequentially added to deionized water, fully stirred at 400-1000r / min for 0.5-3h, and the initial gel was obtained; 2. Crystallization: the The prepared initial gel was placed in a crystallization kettle, crystallized at 130-200°C for 3-36 hours, then cooled to room temperature, and the crystallized product was centrifugally filtered and washed, then put into a drying oven, and cooled at 100°C- Dry at 200°C for 8-36 hours, place the dried crystallized product in a muffle furnace, and roast at 500-650°C for 2-12 h...

Embodiment 2

[0037] The difference between this embodiment and Example 1 is that the mass ratio of the phosphoric acid solution with a mass fraction of 85% and the aluminum isopropoxide with a mass fraction of 24.8% added in step one is 1:(1.6~1.9); The mass fraction of adding is 85% phosphoric acid solution and the mass ratio of silicon dioxide aerosol is 1:(0.05 ~ 0.28); the mass fraction of adding is 85% phosphoric acid solution and mass fraction is 98.3% The mass ratio of butylamine is 1:(0.3~0.9); The mass fraction of adding is that the mass fraction of 85% phosphoric acid solution and mass fraction is 1:(0.3~0.9) of the di-n-propylamine mass ratio of 95%; The added mass fraction is 85% phosphoric acid solution and the mass ratio of 40% HF solution is 1:(0.01 ~ 0.05); the added mass fraction is the mass ratio of 85% phosphoric acid solution and deionized water It is 1: (3.2~4). Others are the same as in Example 1.

Embodiment 3

[0039] One of the differences between this embodiment and Embodiments 1 to 2 is that the mass ratio of the phosphoric acid solution with a mass fraction of 85% and the aluminum isopropoxide with a mass fraction of 24.8% added in step 1 is 1:1.8; The mass fraction of the phosphoric acid solution added is 85% and the mass ratio of silicon dioxide aerosol is 1:0.15; the mass fraction of the added phosphoric acid solution and the mass fraction of 98.3% is the mass The ratio is 1:0.4; the mass fraction of the added phosphoric acid solution and the mass fraction of 95% is 1:0.4; the added mass fraction is the phosphoric acid solution of 85% and the mass fraction The mass ratio of the HF solution with a fraction of 40% is 1:0.02; the mass ratio of the added phosphoric acid solution with a mass fraction of 85% to deionized water is 1:3.5. Other is identical with embodiment 1~2.

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Abstract

The invention relates to a method for synthesizing an SAPO-31 molecular sieve nanocrystal from double templates. The method comprises the following steps: successively adding a phosphoric acid solution with a mass fraction of 85%, aluminum isopropoxide with a mass fraction of 24.8%, a silica aerosol, a mixed solution of di-n-butylamine with a mass fraction of 98.3% and a di-n-propylamine with a mass fraction of 95% and an HF solution with a mass fraction of 40% into deionized water and carrying out full stirring at a speed of 400 to 1000 r / min for 0.5 to 3 h so as to obtain initial gel; and placing the initial gel in a crystallization kettle, carrying out crystallization at a temperature of 130 to 200 DEG C for 12 to 36 h, carrying out cooling to room temperature, then carrying out centrifugal filtration and washing, placing an obtained substance in a drying box for drying at a temperature of 100 to 200 DEG C for 8 to 36 h and roasting the dried substance in a muffle furnace at a temperature of 500 to 650 DEG C for 2 to 12 h so as to obtain an SAPO-31 molecular sieve. The method has shortened crystallization time; and the molecular sieve has strongly adjustable acidity and high acid site density.

Description

technical field [0001] The invention relates to a method for synthesizing SAPO-31 molecular sieve nanocrystals with double templates. Background technique [0002] SAPO-31 molecular sieve is an aluminosilicoaluminophosphate molecular sieve with ATO-type topology, with a one-dimensional straight pore structure of twelve-membered rings, with a channel size of 0.54×0.54nm and exchangeable cations. SAPO-31 molecular sieve can be used as an acidic catalyst with shape-selective catalysis. Using SAPO-31 molecular sieve to support noble metals can make a dual-functional catalyst with both metal active centers and acid centers. Because SAPO-31 has a suitable pore structure and Size, mild and adjustable acidity, the bifunctional catalyst prepared by supporting precious metals on SAPO-31 can realize the synergy between the acid center and the hydrogenation-dehydrogenation active center of the metal, and catalyze the hydroisomerization reaction of normal alkanes At the same time, it ha...

Claims

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Application Information

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IPC IPC(8): C01B37/08C01B39/54B82Y30/00
Inventor 吴伟王新苗孟祥彬周亚静田然张瑞张志华孙发民谭明伟刘彦峰高善彬朱金玲靳丽丽谢彬秦丽红杨晓东刘文勇赵檀张国甲张学佳
Owner PETROCHINA CO LTD
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