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Preparation method for SAPO-11 molecular sieve with large specific surface area and molecular sieve thereof

A technology of SAPO-11 and large specific surface area, which is applied in the field of synthesis of large specific surface area SAPO-11 molecular sieves, can solve the problems of small specific surface area and limit application, and achieve the effects of simple operation, high yield and overcoming low yield

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

AI Technical Summary

Problems solved by technology

[0004] Although the preparation of SAPO-11 molecular sieves with AEL framework was previously reported by the steam-assisted method, its application in catalysis is limited due to its small specific surface area.

Method used

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  • Preparation method for SAPO-11 molecular sieve with large specific surface area and molecular sieve thereof
  • Preparation method for SAPO-11 molecular sieve with large specific surface area and molecular sieve thereof
  • Preparation method for SAPO-11 molecular sieve with large specific surface area and molecular sieve thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0029]Add 10 g of water to a 50 ml beaker, add 2.0 g of crystalline aluminum chloride under magnetic stirring, evenly add 1.5 g of phosphoric acid with a mass concentration of 85%, stir evenly, add dropwise 0.3 g of tetraethyl orthosilicate, and stir for 30 minutes , add 0.10g dimethyl hexadecyl [3-(trimethoxysilyl) propyl] ammonium chloride, stir well, then add 2 ml of propylene oxide dropwise, and continue to stir for 5 minutes. The mixture was aged at 40° C. for 24 hours, and then dried at 100° C. to obtain a precursor mixture. Take 1 gram of the above-mentioned precursor mixture and place it in a PTFE tray with a bracket, place the tray in a stainless steel reaction kettle, add 1 gram of water and 0.5 gram of n-dipropylamine to the bottom of the reaction kettle, heat up to 200 °C after sealing, and keep After 2 days, the reaction mixture was cooled to room temperature and washed 3 times with deionized water. The final white powder was dried in an oven at 120°C, and tested...

Embodiment 2

[0031] Add 5 g of water and 5 g of ethanol into a 50 ml beaker, add 2.0 g of crystalline aluminum chloride under magnetic stirring, evenly add 1.5 g of phosphoric acid with a mass concentration of 85%, and add dropwise 0.5 g of tetraethyl orthosilicate after stirring evenly. After stirring for 30 minutes, 0.30 g of dimethylhexadecyl[3-(trimethoxysilyl)propyl]ammonium chloride was added, and then 2 ml of propylene oxide was added dropwise, and stirring was continued for 5 minutes. The mixture was aged at 40° C. for 24 hours, and then dried at 100° C. to obtain a precursor mixture. Take 1 gram of the above precursor mixture and place it in a PTFE tray with a bracket, and place the tray in a stainless steel reaction kettle, add 1 gram of water and 1 gram of n-dipropylamine to the bottom of the reaction kettle, heat up to 200 ° C after sealing, and keep After 2 days, the reaction mixture was cooled to room temperature and washed 3 times with deionized water. The final white powde...

Embodiment 3

[0033] Add 10 g of ethanol to a 50 ml beaker, add 2.0 g of crystalline aluminum chloride under magnetic stirring, evenly add dropwise 1.5 g of phosphoric acid with a mass concentration of 85%, stir evenly, add dropwise 0.4 g of tetraethyl orthosilicate, and stir for 30 minutes. 0.30 g of dimethyltetradecyl[3-(trimethoxysilyl)propyl]ammonium chloride was added, followed by 3 ml of propylene oxide dropwise, and stirring was continued for 5 minutes. The mixture was aged at 40° C. for 24 hours, and then dried at 100° C. to obtain a precursor mixture. Take 1 gram of the above-mentioned precursor mixture and place it in a PTFE tray with a bracket, place the tray in a stainless steel reaction kettle, add 1 gram of water and 0.5 gram of n-dipropylamine to the bottom of the reaction kettle, heat up to 200 °C after sealing, and keep After 2 days, the reaction mixture was cooled to room temperature and washed 3 times with deionized water. The final white powder was dried in an oven at 1...

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Abstract

The invention discloses a preparation method for an SAPO-11 molecular sieve with a large specific surface area and a molecular sieve thereof. A dried gel method is adopted, mesoporous silicon-aluminum phosphate gel is taken as a precursor, and organic silane is soaked to synthesize the SAPO-11 molecular sieve with an AEL structure confirmed by the International Zeolite Association. The SAPO-11 molecular sieve has a large specific surface area, high hydrothermal stability, and a wide application prospect in the field of catalysis, especially the field of lubricant base oil hydroisomerization. The adopted preparation method has the advantages of high economical performance, safety and convenience in operation, and environmental friendliness.

Description

technical field [0001] The invention relates to a method for synthesizing a silicoaluminophosphate molecular sieve with a large specific surface area, more precisely a method for synthesizing a SAPO-11 molecular sieve with a large specific surface area. Background technique [0002] SAPO-11 is a silicoaluminophosphate molecular sieve (Atlas of Zeolite Framework Types, 6 th ed., Elsevier, Amsterdam, 2007; http: / / www.iza-structure.org / databases / ) It has a one-dimensional elliptical 10-membered ring straight channel with a pore size of 0.40nm×0.65nm. Since the pore structure size and geometric configuration of this molecular sieve are very conducive to the formation of single-branched alkane isomers, the isomerization reaction of Pt-Pd / AEL silicoaluminophosphate molecular sieves loaded with platinum, palladium and precious metals shows that good catalytic activity and selectivity. However, its own micropores are not conducive to the diffusion of molecules, which limits its c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B39/54C01B37/08
Inventor 田志坚陶硕厉晓蕾徐仁顺马怀军王炳春
Owner DALIAN INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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