Synthesis method of ZSM-5 molecular sieve and ZSM-5 molecular sieve

A technology of ZSM-5 and synthesis method, which is applied in the direction of nanotechnology, crystalline aluminosilicate zeolite, borocarbane silicone crystalline aluminosilicate zeolite, etc., which can solve the problem of difficulty in fully utilizing acidic sites, small pore size, and easy accumulation of catalysts. Carbon deactivation and other issues

Inactive Publication Date: 2017-06-09
DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Conventional ZSM-5 crystals are generally micron-sized, due to their small pore size (approximately ), which is not conducive to molecular diffusion and mass transfer, a

Method used

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  • Synthesis method of ZSM-5 molecular sieve and ZSM-5 molecular sieve
  • Synthesis method of ZSM-5 molecular sieve and ZSM-5 molecular sieve

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] Embodiment 1: NaOH 0.3g, NaAlO 2 Put 0.437g in a 250ml polypropylene beaker, add 30g of deionized water, stir at room temperature for 5 minutes to make NaOH and NaAlO 2 Dissolve, add 10g of piperidine to the above solution, stir for 10 minutes to obtain a uniform solution, slowly add 20g of LUDOX AS-40 silica sol into the above solution dropwise under stirring. The resulting mixture was placed under magnetic stirring at 30°C (600 rpm) for 4h for gelation / precrystallization, and then transferred to a 100ml autoclave with a Teflon liner for dynamic crystallization at 145°C for 5 days (taken The mode of operation is to place the reaction kettle on a rotating motor, and the motor speed is 60 rpm). After the crystallization, the reaction kettle was placed in cold water to quickly cool down to room temperature, then suction filtered and washed repeatedly with 1L of deionized water, and the obtained precipitate was dried at 110°C for 12 hours. Then roast in the muffle furnac...

Embodiment 2

[0013] Embodiment 2: operation is the same as embodiment 1, the add-on of piperidine is 5.677g. XRD showed that the obtained sample was ZSM-5 molecular sieve.

Embodiment 3

[0014] Embodiment 3: NaOH 0.32g, NaAlO 2 Put 0.656g in a 250ml polypropylene beaker, add 36g of deionized water, stir at room temperature for 5 minutes to make NaOH and NaAlO 2 Dissolve, add 8.52g of piperazine to the above solution, stir for 10 minutes to obtain a uniform solution, slowly add 20g of LUDOX AS-40 silica sol into the above solution dropwise under stirring. The resulting mixture was placed under magnetic stirring at 25°C (600 rpm) for 3h for gelation / precrystallization, and then transferred to a 100ml autoclave with a Teflon liner for dynamic crystallization at 150°C for 5 days (taken The mode of operation is to place the reaction kettle on a rotating motor, and the motor speed is 40 rpm). After the crystallization, the reaction kettle was placed in cold water to quickly cool down to room temperature, then suction filtered and washed repeatedly with 1L of deionized water, and the obtained precipitate was dried at 110°C for 12 hours. Then roast in the muffle fur...

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Abstract

The invention relates to a method for synthesizing nanometer ZSM-5 molecular sieves with sheet-like interlaced self-supporting structures, and belongs to the technical field of inorganic synthesis and catalyst preparation. In this method, silica sol and sodium metaaluminate are used as silicon source and aluminum source, and one or two or more organic substances in piperazine, morpholine, triethylenediamine, and piperidine are added in the synthesis, and the raw materials are mixed in 20-50 °C for gelation for 0.5-10 hours, and then transferred to a high-pressure reactor for crystallization at 120-180 °C, and the obtained ZSM-5 molecular sieve has a sheet-like interlaced self-supporting structure after roasting.

Description

technical field [0001] The invention belongs to the technical field of inorganic synthesis and catalyst preparation, and relates to a method for synthesizing nanometer ZSM-5 molecular sieves with sheet-like interlaced self-supporting structure. Background technique [0002] Mobil Corporation firstly reported in 1972 the method for synthesizing ZSM-5 molecular sieves using quaternary ammonium salts as a template (USP3702886). ZSM-5 is a molecular sieve with a high silicon-aluminum ratio of MFI structure. There is no cage in its structure, but a 3-dimensional intersecting pore structure, so it exhibits unique selective catalytic performance. At the same time, ZSM-5 has strong acidity and With excellent hydrothermal stability, it is widely used in catalytic cracking, synthesis of p-xylene, conversion of methanol to olefins and gasoline. Conventional ZSM-5 crystals are generally micron-sized, due to their small pore size (approximately ), which is not conducive to molecular d...

Claims

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Application Information

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IPC IPC(8): C01B39/40C01B39/38B82Y40/00
Inventor 展恩胜申文杰李勇
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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