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Two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material and preparation method thereof

A technology of SAPO-34 and molecular sieve, which is applied in the direction of molecular sieve and alkali exchange phosphate, molecular sieve characteristic silicoaluminophosphate, nanotechnology for materials and surface science, etc., to achieve no environmental pollution, universal method and low cost Effect

Active Publication Date: 2018-12-11
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Summarizing the results of the literature on the preparation of SAPO-34 molecular sieves over the years, it can be found that there is no method to prepare a two-dimensional ultra-thin SAPO-34 molecular sieve sheet material with an adjustable silicon-aluminum ratio and a thickness of less than 25 nanometers

Method used

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  • Two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material and preparation method thereof
  • Two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material and preparation method thereof
  • Two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Get 0.500 gram of aluminum phosphate nano-volume powder, add 0.050 gram of tetraethyl orthosilicate and 0.550 gram of methanol, stir at room temperature into a uniform paste, leave it for 24 hours; after that, add 0.100 gram of tetraethylammonium hydroxide (25% ) solution, stirred into a uniform paste, and left for 24 hours; after that, it was transferred to a hydrothermal kettle with 0.100 gram of water, 0.200 gram of tetraethylammonium hydroxide (25%) solution and 0.400 gram of triethylamine In the polytetrafluoroethylene lining, seal; after that, hydrothermal at 160 ° C for 72 hours; after that, naturally cool to room temperature, filter to obtain the precipitate, and use water and absolute ethanol to wash the precipitate several times, and dry at 60 ° C for 24 hours , to obtain a dry white powder; then, put the obtained white powder into a muffle furnace, and raise the temperature from room temperature to 550° C. under an air atmosphere, and keep it for 5 hours. Fin...

Embodiment 2

[0032] Get 1.000 gram of aluminum phosphate nano-volume powder, add 0.500 gram of tetraethyl orthosilicate and 0.700 gram of ethanol, stir into a uniform paste at room temperature, and leave it for 24 hours; after that, add 0.400 gram of tetraethylammonium hydroxide (25% ) solution, stirred into a uniform paste, and left for 24 hours; after that, it was transferred to a hydrothermal kettle with 0.400 gram of water, 0.800 gram of tetraethylammonium hydroxide (25%) solution and 2.000 gram of triethylamine In the polytetrafluoroethylene lining, seal; after that, hydrothermal at 180 ° C for 48 hours; after that, naturally cool to room temperature, filter to obtain the precipitate, and use water and absolute ethanol to wash the precipitate several times, and dry at 60 ° C for 24 hours , to obtain a dry white powder; then, put the obtained white powder into a muffle furnace, and raise the temperature from room temperature to 550° C. under an air atmosphere, and keep it for 5 hours. ...

Embodiment 3

[0035] Get 2.000 grams of aluminum phosphate nanovolume powder, add 0.40 grams of tetrapropyl orthosilicate and 2.000 grams of methanol, stir at room temperature into a uniform paste, and leave it for 24 hours; after that, add 0.500 grams of tetraethylammonium hydroxide (25% ) solution, stirred into a uniform paste, and left for 24 hours; after that, it was transferred to a hydrothermal kettle with 0.600 grams of water, 1.000 grams of tetraethylammonium hydroxide (25%) solution and 2.400 grams of triethylamine In the polytetrafluoroethylene lining, seal; after that, 200 ℃ water heating for 20 hours; after that, naturally cool to room temperature, filter to get the precipitate, and use water and absolute ethanol to wash the precipitate several times, and dry at 60 ℃ for 24 hours , to obtain a dry white powder; then, put the obtained white powder into a muffle furnace, and raise the temperature from room temperature to 550° C. under an air atmosphere, and keep it for 5 hours. Fina...

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Abstract

The invention discloses a two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material. The thickness is 1-25 nanometers, and a crystal structure is a SAPO-34 molecular sieve, wherein a silicon / aluminium atom ratio is 0.05-0.3. The two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material is characterized in that cheap easy-to-get aluminium phosphate, a silicon source and organic amine are used as reactants, through a chemical method, a layered precursor is exfoliated, and then gaseous phase crystallization is conducted to prepare the two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material. The two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material has a an enormous surface area, the silicon content is adjustable in a certain range, and a method is pervasive; the material has multiple advantages and can be subjected to industrial large-scale production; the method is little in template usage, suitable for industrial large-scale production and low in cost, and basically, no environmental pollution is generated. The invention discloses the preparation method of the two-dimensional ultra-thin SAPO-34 molecular sieve sheeting material.

Description

Technical field: [0001] The invention relates to a two-dimensional ultrathin SAPO-34 molecular sieve sheet material and a preparation method thereof. Background technique: [0002] SAPO-34 is the most eye-catching type of SAPO series molecular sieves (alumino-silicon phosphate molecular sieves). Due to its unique CHA-type molecular sieve channel structure, suitable for adjustable acidity, good thermal stability and hydrothermal stability, it is used in many The reaction showed excellent catalytic activity. Among them, it has high selectivity to C2-C4 products in the catalytic conversion of methanol to light olefins (MTO), and is recognized as the best catalyst for the MTO reaction. In addition, it also exhibits excellent catalytic performance in the catalytic selective reduction of NOx and the purification of automobile exhaust. At the same time, it was found that SAPO-34 molecular sieves with different morphological structures have great differences in their catalytic per...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B37/08C01B39/54B82Y30/00B82Y40/00
CPCB82Y30/00B82Y40/00C01B37/08C01B39/54C01P2002/72C01P2004/04C01P2004/64
Inventor 郭向可郭学锋丁维平祝艳薛念华彭路明
Owner NANJING UNIV
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