Method for synthesizing SAPO-31 molecular sieves through microwave heating

A SAPO-31, microwave heating technology, applied in the field of preparation of SAPO-31 molecular sieves, can solve the problems of miscellaneous crystals, expensive templating agents, long crystallization time, etc., and achieve shortened crystallization time and acidity controllability Strong, cost-reducing effect

Active Publication Date: 2010-07-28
HEILONGJIANG UNIV
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Problems solved by technology

[0004] The present invention provides a method for synthesizing SAPO-31 molecular sieve by microwave heating in order to solve the problems of long cr

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  • Method for synthesizing SAPO-31 molecular sieves through microwave heating
  • Method for synthesizing SAPO-31 molecular sieves through microwave heating
  • Method for synthesizing SAPO-31 molecular sieves through microwave heating

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specific Embodiment approach 1

[0011] The specific embodiment one: a kind of microwave heating synthesis method of SAPO-31 molecular sieve of the present embodiment is carried out according to the following steps: one, by phosphoric acid: water: di-n-butylamine: aluminum isopropoxide: silicon aerosol=1: 3~ 4: 0.6~1: 1.5~2: 0.02~0.3 The ratio of parts by weight weighs phosphoric acid, water, di-n-butylamine, aluminum isopropoxide and silicon aerosol, first adds phosphoric acid into water, stirs for 3min~10min, Obtain a phosphoric acid solution; 2. Under stirring conditions, add di-n-butylamine to the phosphoric acid solution obtained in step 1, and stir for 10 minutes to 20 minutes to obtain a mixed solution; 3. Under stirring conditions, add silicon aerosol and isopropyl Add the aluminum alkoxide to the mixed solution obtained in step 2, stir for 50min to 150min to obtain a gel; 4, put the gel obtained in step 3 in a reaction kettle, and heat it with a microwave with a power of 500W to 700W, at 130 to Cryst...

specific Embodiment approach 2

[0014] Specific embodiment two: the difference between this embodiment and specific embodiment one is: in step one, by phosphoric acid: water: di-n-butylamine: aluminum isopropoxide: silicon aerosol=1: 3.2~3.8: 0.7~0.9: 1.6 Phosphoric acid, water, di-n-butylamine, aluminum isopropoxide and silicon aerosol are weighed in a ratio of parts by weight of ˜1.9:0.05˜0.28. Others are the same as in the first embodiment.

specific Embodiment approach 3

[0015] Specific embodiment three: this embodiment is different from specific embodiment one or two: in step one, by phosphoric acid: water: di-n-butylamine: aluminum isopropoxide: silicon aerosol=1: 3.5: 0.8: 1.8: 0.15 The ratio of parts by weight of phosphoric acid, water, di-n-butylamine, aluminum isopropoxide and silicon aerosol was weighed. Others are the same as in the first or second embodiment.

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Abstract

The invention provides a method for synthesizing an SAPO-31 molecular sieve through microwave heating, which relates to a preparation method of an SAPO-31 molecular sieve. The invention solves the problems that the crystallization time of the existing preparation method of the SAPO-31 molecular sieve is long, stray crystals exist in products, and the price of template agents is high. The method of the invention comprises the following steps: firstly, preparing phosphorous acid, water, di-n-butylamine, aluminium isopropoxide and silicon aerosol into gel; then, placing the gel into a reaction kettle to be heated by microwaves; carrying out crystallization at 130 DEG C to 190 DEG C; and then, obtaining the SAPO-31 molecular sieve through centrifugal filtration, washing, drying and roasting. The invention has the advantages of short crystallization time, no stray crystal and low price of the template agents. The SAPO-31 molecular sieve of the invention is applied to the fields of petrochemical industry and fine chemistry industry as a catalyst.

Description

technical field [0001] The invention relates to a preparation method of SAPO-31 molecular sieve. 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. [0003] The silicon-free AIPO-31 aluminophosphate molecular sieve has no acid sites due to the charge balance of the framework composed of alternating aluminum-oxygen tetrahedrons and phosphorus-oxygen tetrahedrons. SAPO-31 molecular sieve introduces silicon atoms into AIPO-31 molecular sieve framework to replace phosphorus and aluminum atoms in the framework, thereby generating acid centers. SAPO-31 molecular sieve can be used as an acidic catalyst with shape-selective catalysis. Supporting precious metals can make a dual-functional catalyst with both metal active centers and acid centers. Because SAPO-31 has a suitab...

Claims

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Application Information

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IPC IPC(8): C01B39/54C01B37/08B01J29/85
Inventor 吴伟杨杰闫鹏飞肖林飞
Owner HEILONGJIANG UNIV
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