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Preparation method of nano SAPO-31 molecular sieve

A technology of SAPO-31 and molecular sieve, which is applied in the field of preparation of SAPO-31 molecular sieve, can solve problems such as miscellaneous crystals in products, and achieve the effects of shortening crystallization time, improving selectivity, and high acid site density

Active Publication Date: 2013-01-30
HEILONGJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The present invention will solve the problem of miscellaneous crystals in the product prepared by the method for preparing SAPO-31 molecular sieve in the prior art, and provide a preparation method of pure phase nanometer SAPO-31 molecular sieve

Method used

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specific Embodiment approach 1

[0007] Specific embodiment one: This embodiment provides a kind of preparation method of pure phase nanometer SAPO-31 molecular sieve, specifically is finished according to the following steps:

[0008] 1. Preparation of the initial gel: Phosphoric acid solution with a mass fraction of 85%, aluminum isopropoxide with a mass fraction of 24.8%, fumed silica (Cab-O-Sil M-5), and dioxane with a mass fraction of 98.3% Add n-butylamine and HF solution with a mass fraction of 40% into deionized water in sequence, and stir fully at 400-1000r / min for 0.5-3h to obtain the initial gel; 2. Forming: the initial gel prepared in step 1 Place the glue in a crystallization kettle, crystallize at 130-200°C for 3-36 hours, then cool to room temperature, and put the crystallized product in a drying oven after centrifugal filtration and washing, and dry at 100°C-200°C 8h to 36h, put the dried crystallized product in a muffle furnace, and roast at 500-650°C for 2h-8h to obtain nano-SAPO-31 molecula...

specific Embodiment approach 2

[0013] Specific embodiment two: the difference between this embodiment and specific embodiment one is: the mass fraction of the phosphoric acid solution added in step one is 85% and the mass fraction is 24.8% aluminum isopropoxide mass ratio is 1:( 16~1.9), the mass fraction of the added mass fraction is 85% phosphoric acid solution and the mass ratio of fumed silica (Cab-O-Sil M-5) is 1:(0.05~0.28), the mass fraction of the added The mass ratio of 85% phosphoric acid solution to 98.3% di-n-butylamine is 1:(0.7~0.9), and the added mass fraction is 85% phosphoric acid solution and 40% HF solution The mass ratio of the added phosphoric acid solution with a mass fraction of 85% and deionized water is 1:(3.2~4). Others are the same as in the first embodiment.

specific Embodiment approach 3

[0014] Specific embodiment three: the difference between this embodiment and one of specific embodiments one to two is: the mass fraction of the phosphoric acid solution added in step 1 is 85% and the mass ratio of aluminum isopropoxide of 24.8% is 1:1.8, the added mass fraction is 85% phosphoric acid solution and the mass ratio of fumed silica (Cab-O-Sil M-5) is 1:0.15, the added mass fraction is 85% phosphoric acid Solution and mass fraction are that the mass ratio of the di-n-butylamine of 98.3% is 1:0.8, and the mass fraction of adding is that the mass ratio of the phosphoric acid solution of 85% and the HF solution of 40% is 1:0.02, so The mass ratio of the added phosphoric acid solution with a mass fraction of 85% to deionized water is 1:3.5. Others are the same as the specific embodiment 1 to 2.

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Abstract

The invention provides a preparation method of a pure phase nano SAPO-31 molecular sieve, relates to the field of SAPO-31 molecular sieve preparation, and is used for solving the problems that in the prior art, the method for preparing the SAPO-31 molecular sieve has the disadvantages of long crystallization time, large grain size and easy emergence of impure crystals in products. The preparation method provided by the invention comprises the following operation steps: 1. preparing an initial gel; and 2. molding. The preparation method has the advantages that: 1. the prepared nano SAPO-31 molecular sieve is a pure phase; 2. the diameter of the synthesized SAPO-31 molecular sieve grains is about 40 nm; 3. the crystallization time is shortened by 2-8 times; and 4. the silicon-aluminum ratio of the synthesized SAPO-31 molecular sieve is 0.1-1.0, so that the molecular sieve has the stronger adjustability and controllability of acidity and higher density of acid sites. The preparation method provided by the invention is mainly used for the preparation of pure phase nano SAPO-31 molecular sieves.

Description

technical field [0001] The invention relates to the field of preparation of SAPO-31 molecular sieves. 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 has good reactivity and high selec...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B37/08C01B39/54
Inventor 吴伟周亚静闫鹏飞张瑞
Owner HEILONGJIANG UNIV
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