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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 crystallization time, miscellaneous crystals in the product and high price of template agent in the existing method for preparing SAPO-31 molecular sieve

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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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