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A kind of porous graphene/molecular sieve composite film acid catalyst and its preparation method and application

A technology of porous graphene and composite film, which is applied in the field of preparation and application of catalytic materials to achieve the effects of improving acid strength and cycle performance, high reproducibility and wide application prospects

Active Publication Date: 2020-09-22
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, there are relatively few studies on graphene and traditional zeolite molecular sieve composite materials, and the research on the shape, shape and structure of traditional zeolite molecular sieves is of great significance. Applications

Method used

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  • A kind of porous graphene/molecular sieve composite film acid catalyst and its preparation method and application
  • A kind of porous graphene/molecular sieve composite film acid catalyst and its preparation method and application
  • A kind of porous graphene/molecular sieve composite film acid catalyst and its preparation method and application

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] The preparation of porous graphene / molecular sieve composite film acid catalyst specifically comprises the following steps:

[0042] (1) Preparation of molecular sieve precursor solution: Mix aluminum source, silicon source, tetrapropylammonium hydroxide and deionized water at a molar ratio of 0.5:60:11.5:1500 to form molecular sieve precursor aqueous solution, specifically weigh 0.6g Aluminum isopropoxide, 19g of tetrapropyl ammonium hydroxide and 160g of deionized water are mixed uniformly to obtain a molecular sieve precursor solution;

[0043] (2) Compounding of graphene and molecular sieve: Mix 30 mL of molecular sieve precursor solution with 30 mL of graphene dispersion (2mg / mL) (the content of graphene relative to the molecular sieve precursor is 24wt%), and stir at room temperature for 4h After mixing evenly, stir at 90°C for 24 hours. The precipitated product is centrifuged and washed 3 times with an aqueous solution of ethanol (ethanol: water = 1:1, v / v), and ...

Embodiment 2

[0054] The preparation of graphene / molecular sieve composite porous solid acid catalyst specifically comprises the following steps:

[0055] (1) Preparation of molecular sieve precursor solution: Mix aluminum source, silicon source, tetrapropylammonium hydroxide and deionized water at a molar ratio of 0.6:30:5:500 to form molecular sieve precursor aqueous solution, specifically weigh 0.6g Aluminum isopropoxide, 19g of tetrapropyl ammonium hydroxide and 160g of deionized water are mixed uniformly to obtain a molecular sieve precursor solution;

[0056] (2) Compounding of graphene and molecular sieve: Mix 100 mL of molecular sieve precursor solution with 200 mL of graphene dispersion (2 mg / mL) (the content of graphene relative to the molecular sieve precursor is 18 wt%), and stir at room temperature for 4 h After mixing evenly, stir at 50°C for 48 hours. The precipitated product is centrifuged and washed 6 times with an aqueous solution of ethanol (ethanol: water = 1:1, v / v), an...

Embodiment 3

[0067] The preparation of graphene / molecular sieve composite porous solid acid catalyst specifically comprises the following steps:

[0068] (1) Preparation of molecular sieve precursor solution: Mix aluminum source, silicon source, tetrapropylammonium hydroxide and deionized water in a molar ratio of 1:0.00625:0.25:30 to form molecular sieve precursor aqueous solution, specifically weigh 0.6g Aluminum isopropoxide, 19g of tetrapropyl ammonium hydroxide and 160g of deionized water are mixed uniformly to obtain a molecular sieve precursor solution;

[0069] (2) Compounding of graphene and molecular sieve: Mix 60 mL of molecular sieve precursor solution with 100 mL of graphene dispersion (2mg / mL) (the content of graphene relative to the molecular sieve precursor is 30wt%), and stir at room temperature for 4h After mixing evenly, stir at 120°C for 12 hours. The precipitated product is centrifuged and washed 4 times with an aqueous solution of ethanol (ethanol: water = 1:1, v / v), ...

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Abstract

The invention discloses a porous graphene / molecular sieve composite film acid catalyst, and a preparation method and applications thereof. According to the preparation method, synthesis of a quasi-two-dimensional graphene / molecular sieve composite film material is realized via the interface interaction of graphene sheets with molecular sieve particles. The obtained quasi-two-dimensional graphene / molecular sieve composite film material possesses fully exposed catalytic activity sites and shorter mass transfer pore passages, so that excellent acid catalytic properties are achieved. The preparation method possesses following advantages: the raw materials are widely available; operation technology is simple; operation is convenient to control; repeatability is high; compared with conventional solid acid, the porous graphene / molecular sieve composite film acid catalyst is capable of improving the acidity strength, catalytic performance, and cycling stability of molecular sieve, and industrialized large scale production is convenient to realize. The porous graphene / molecular sieve composite film acid catalyst is high in purity, excellent in structure composition, is of a multistage pore structure, is excellent in mechanical properties, possesses excellent catalytic performance in the field of acid catalysis, can be recycled for a plurality of times, and is promising in application prospect in the field of organic catalytic reaction.

Description

technical field [0001] The invention relates to the field of preparation and application of catalytic materials, in particular to a porous graphene / molecular sieve composite film acid catalyst and its preparation method and application. Background technique [0002] Aluminosilicate molecular sieves (ZSM-5) are widely used as catalysts in industrial production due to their good structure, composition, complex microporous structure and strong acidity. However, the relatively small pore size and single microporous structure limit its catalytic applications, including the catalytic reactions of some macromolecules. One of the modification methods is to introduce porosity into the molecular sieve structure, so that it has both microporous and porous structures. Currently, improved molecular sieves with relatively large pore sizes have been successfully prepared and can be used to catalyze alkylation, isomerization, cracking, and polycondensation reactions. However, the synthesi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J29/40C07D317/20C07C45/74C07C49/835C07C41/56C07C43/305
CPCB01J29/40B01J35/1057B01J35/1061C07C41/56C07C45/74C07D317/20C07C49/835C07C43/305
Inventor 黄建林王俊中林湘君王亚萌张会念
Owner SOUTH CHINA UNIV OF TECH
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