C3N4-supported acid/alkali bifunctional MOFs-based composite catalyst, and preparation method and application thereof

An acid-base bifunctional, composite catalyst technology, applied in catalyst activation/preparation, organic compound/hydride/coordination complex catalysts, chemical instruments and methods, etc. , the low pH of the catalyst, etc., to promote the isomerization process and dehydration reaction, increase the yield, and achieve the effect of easy recovery

Inactive Publication Date: 2018-08-24
JIANGSU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] At present, there are still some problems in the acid-base dual-functional solid catalysts that have been developed and designed, mainly in: (1) the pore structure of the catalyst is single, and the specific surface area is small; (2) the pH of the catalyst is low, and the catalytic performance is relatively poor; ( 3) Most of the catalysts are in the form of small particles, it is difficult to separate the catalyst from the product, and it is difficult to recycle

Method used

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  • C3N4-supported acid/alkali bifunctional MOFs-based composite catalyst, and preparation method and application thereof
  • C3N4-supported acid/alkali bifunctional MOFs-based composite catalyst, and preparation method and application thereof
  • C3N4-supported acid/alkali bifunctional MOFs-based composite catalyst, and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] 1.C 3 N 4 @PDA@UiO-66-NH 2 -SO 3 The preparation method of H is characterized in that it is carried out according to the following steps:

[0032] (1) 250mg dopamine hydrochloride was dissolved in 250mL Tris buffer solution, then 1g C 3 N 4 Add to the mixing system and disperse evenly. Then the mixed system was stirred and reacted in a water bath at 20° C. for 12 h. After the reaction, the product was centrifuged and washed three times with deionized water. The washed product was dried under vacuum at 100 °C to obtain C 3 N 4 @PDA composites.

[0033] (2) 0.05g of zirconium oxychloride octahydrate, 0.02g of 2-aminoterephthalic acid and 0.03g of monosodium 2-sulfonic acid terephthalate were successively dissolved in 5mL of water / acetic acid (v / v=3:2 ) mixed solution, the mixed system was ultrasonically mixed; then 30mgC 3 N 4 @PDA composite material will be put into the above mixing system, shake well. The mixed system was then placed in a water bath at 80° ...

Embodiment 2

[0052] 1.C 3 N 4 @PDA@UiO-66-NH 2 -SO 3 The preparation method of H is characterized in that it is carried out according to the following steps:

[0053](1) 500mg dopamine hydrochloride was dissolved in 500mL Tris buffer solution, and then 2g C 3 N 4 Add to the mixing system and disperse evenly. Then the mixed system was stirred and reacted in a water bath at 30° C. for 24 h. After the reaction, the product was centrifuged and washed three times with deionized water. The washed product was dried under vacuum at 100 °C to obtain C 3 N 4 @PDA composites.

[0054] (2) 4.65g of zirconium oxychloride octahydrate, 1.31g of 2-aminoterephthalic acid and 1.43g of monosodium 2-sulfonic terephthalate were successively dissolved in 300mL of water / acetic acid (v / v=3:2 ) mixed solution, the mixed system was ultrasonically mixed; then 1800mgC 3 N 4 @PDA composite material will be put into the above mixing system, shake well. The mixed system was then placed in a water bath at 90...

Embodiment 3

[0062] 1.C 3 N 4 @PDA@UiO-66-NH 2 -SO 3 The preparation method of H is characterized in that it is carried out according to the following steps:

[0063] (1) 750mg dopamine hydrochloride was dissolved in 750mL tris buffer solution, then 3g C 3 N 4 Add to the mixing system and disperse evenly. Then the mixed system was stirred and reacted in a water bath at 40° C. for 36 h. After the reaction, the product was centrifuged and washed three times with deionized water. The washed product was dried under vacuum at 100 °C to obtain C 3 N 4 @PDA composites.

[0064] (2) 9.3g of zirconium oxychloride octahydrate, 2.61g of 2-aminoterephthalic acid and 3.86g of monosodium 2-sulfonic terephthalate were successively dissolved in 600mL of water / acetic acid (v / v=3:2 ) mixed solution, the mixed system was ultrasonically mixed; then 3600mgC 3 N 4 @PDA composite material will be put into the above mixing system, shake well. The mixed system was then placed in a water bath at 98° C....

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Abstract

The invention belongs to the field of solid composite catalysts, and provides a C3N4-supported acid / alkali bifunctional metal organic framework (MOFs) based composite catalyst, and a preparation method and an application thereof. The preparation method comprises the steps of: 1) dissolving carbon nitride and dopamine hydrochloride in a trihydroxymethyl-aminomethane buffer solution prepared before,performing a stirring reaction, and filtering, washing and drying a reaction product after the reaction is finished to prepare C3N4@PDA; 2) dissolving a zirconium salt, 2-aminoterephthalic acid and mono-sodium 2-sulfuric terephthalate in a weak-acid solution and performing ultrasonic dispersion, adding the C3N4@PDA to the mixture system, and performing vibrating mixing and a water bath reaction;3) centrifugally collecting and washing the reaction product; and 4) filtering and vacuum-drying the product to prepare the C3N4-suppported acid / alkali bifunctional MOFs-based composite catalyst, which has a porous structure and large specific surface area, and has beneficial to adsorption of glucose molecules, thus improving isomerization process and dehydration reaction.

Description

technical field [0001] The invention belongs to the field of solid composite catalysts, in particular to a carbon nitride-supported acid-base bifunctional metal-organic framework (MOFs)-based composite catalyst and a preparation method thereof. Background technique [0002] 5-Hydroxymethylfurfural (5-HMF), a biomass-based platform compound containing furan ring, hydroxyl group and aldehyde group in its molecule, is chemically active and can generate many chemicals through oxidation, hydrogenation and condensation reactions. These chemicals are widely used in medicine, pesticides, active agents, optoelectronic materials and other fields. Therefore, its research and application in various fields have made great contributions to the substitution of biomass energy for traditional fossil energy represented by coal, oil and natural gas, and to solving the growing energy crisis and environmental pollution problems. [0003] 5-HMF is usually produced by dehydration of cellulose, gl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/22B01J37/24B01J35/10B01J37/10C07D307/46
CPCB01J31/1691B01J31/2213B01J35/10B01J37/10B01J37/24B01J2531/0238B01J2531/48C07D307/46
Inventor 张云雷金佩赵娇娇王凯刘猛
Owner JIANGSU UNIV
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