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Synthesizing method of gallosilicate molecule sieve Ga-ZSM-12

A technology of silicogallate and synthesis method, applied in ZSM-12 type crystalline aluminosilicate zeolite, crystalline aluminosilicate zeolite, etc., can solve the problems of high cost, low catalytic activity, etc. Catalytic performance, effect of improving diffusion performance

Inactive Publication Date: 2010-08-04
HEILONGJIANG UNIV
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  • Claims
  • Application Information

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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the Ga-ZSM-12 molecular sieve synthesized by the MTEABr template is mainly microporous, and has high cost and low catalytic activity, and provides a Ga-ZSM-12 gallosilicate molecular sieve new method of synthesis

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  • Synthesizing method of gallosilicate molecule sieve Ga-ZSM-12
  • Synthesizing method of gallosilicate molecule sieve Ga-ZSM-12
  • Synthesizing method of gallosilicate molecule sieve Ga-ZSM-12

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specific Embodiment approach 1

[0012] Embodiment 1: In this embodiment, the synthesis method of gallosilicate molecular sieve Ga-ZSM-12 uses tetraethylammonium hydroxide (TEAOH) as a template, and the synthesis method is realized through the following steps: 1. Weigh 1 part of gallium oxide, 100-150 parts of TEAOH aqueous solution, 60-120 parts of silica sol and 5-10 parts of anhydrous sodium sulfate according to the weight fraction ratio, and stir for 15 minutes, wherein the weight percentage of TEAOH in the TEAOH aqueous solution is ≥35 %, SiO in silica sol 2 The weight percentage is 39.1%; 2. Add the gallium oxide weighed in step 1 to the TEAOH aqueous solution weighed in step 1, stir evenly to make a mixed solution, and then place the mixed solution in a tank with a polytetrafluoroethylene inner liner In a closed stainless steel reaction kettle, treat at a temperature of 160-200°C for 6-24 hours and then cool to room temperature to obtain A solution; 3. Under the stirring condition of 200-400r / min, weig...

specific Embodiment approach 2

[0014] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in step 1, 1 part of gallium oxide, 103 parts of TEAOH aqueous solution, 82 parts of silica sol and 7.6 parts of anhydrous sodium sulfate were weighed in step 1. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0015]Embodiment 3: This embodiment is different from Embodiment 1 or Embodiment 2 in that: in step 2, the temperature of 180° C. is treated for 12 hours. Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention relates to a synthesizing method of a gallosilicate molecule sieve Ga-ZSM-12, belonging to the field of preparation of zeolite molecule sieve catalysts and solving the problems of high cost and low catalytic activity of a Ga-ZSM-12 molecule sieve synthesized by adopting a methyltriethylammonium bromide (MTEABr) template agent at present. The synthesizing method of the gallosilicate molecule sieve Ga-ZSM-12 comprises the following steps of: preparing an alkali source, a gallium source, a silicon source, a template agent and deionized water into a uniform mixture; crystallizing at 160-200 DEG C for 4-6 days; cooling to room temperature; and filtering, washing, drying and roasting a product to prepare a pure-phase Ga-ZSM-12 molecule sieve. The synthesizing method has low synthesizing cost of the Ga-ZSM-12 molecule sieve; and in addition, the Ga-ZSM-12 molecule sieve can be outstandingly enhanced in catalytic property because a molecule sieve crystal has a secondary mesoporous structure and can be used in the fields of a petrochemical industry, an organic chemical industry, a fine chemical industry, and the like as a catalyst.

Description

technical field [0001] The invention belongs to the field of preparation of zeolite molecular sieve catalysts; in particular, it relates to a method for synthesizing Ga-ZSM-12 molecular sieves. Background technique [0002] ZSM-12 molecular sieve has MTW topological structure, one-dimensional linear non-intersecting channels composed of twelve-membered rings, and the pore size is 0.57×0.61nm, which belongs to high silicon zeolite. This pore size between medium and large pore zeolites can effectively realize the shape-selective catalytic conversion of most organic molecules, and exhibit excellent catalytic performance in reactions such as aromatic hydrocarbon alkylation and isomerization. The prospects are very bright. However, due to the relatively small pore size of ZSM-12 molecular sieve, the diffusion resistance of molecules with large kinetic size increases in the pore, which limits its application in macromolecular catalytic reactions to a certain extent. In recent ye...

Claims

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Application Information

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IPC IPC(8): C01B39/42
Inventor 吴伟王瑜吴维果
Owner HEILONGJIANG UNIV
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