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Precious metal nanoparticle supported porous material catalyst and preparation method thereof

A nanoparticle and porous material technology, which is applied in the field of porous material catalyst loaded with precious metal nanoparticles and its preparation, can solve the problems of insufficient mechanical strength and unfavorable recovery, and achieve the effect of easy separation and recovery, difficult aging and high activity

Active Publication Date: 2018-04-24
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the porous catalytic material can provide a large catalytic area, the mechanical strength of the material is insufficient. Under the action of stirring, some small blocks will be brittle and fall off to form powdery suspended matter, which is not conducive to recycling.

Method used

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  • Precious metal nanoparticle supported porous material catalyst and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] PEI (polyethyleneimine, 1g, product of Aldrich Company, molecular weight 10000) and polystyrene (PS, 8g, molecular weight 8000) end-capped by monoglycerol ether were mixed in chloroform, reacted at room temperature for 2 days, and formed dendritic double Parents (references Wan D.C, Yuan J.J., Pu H.T. Macromolecular Nancapsule Derived from Hyperbranched Polyethyleneimine (HPEI): Mechanism of Guest Encapsulation versus Molecular Parameters [J]. Macromolecules. 2009, 42 (5), 1533-1540). Propylene oxide (1 mL) was then added to the chloroform solution of the dendritic amphiphile and maintained for 5 h to obtain PEI@PS (9 g). PEI@PS (2.25g) was dissolved in chloroform (20mL), chloroauric acid (0.08g) and water (2mL) were added and stirred for 12h. After that, it was washed with salt water, the chloroform phase was separated, and then the chloroform was removed by rotary evaporation to obtain gold nanocomposite particles of PEI@PS.

[0034]Take bis-3-propylamine-terminated ...

Embodiment 2

[0037] Silver nitrate was used instead of chloroauric acid, and the rest was the same as in Example 1 to prepare a porous material catalyst loaded with silver nanoparticles. The catalyst was used to catalyze the reduction of 4-nitrophenol, and the activity was not lowered after repeated use for 7 times.

Embodiment 3

[0039] Mix PEI (polyethyleneimine, 0.4g, 9.3mmol amino hydrogen) and cetyl glyceryl ether (1.38g, 0.5 amino hydrogen equivalent) in chloroform, and react at room temperature for 24h to form a dendritic amphiphile (1.58g) (references Wan D.C, Yuan J.J., Pu H.T. Macromolecular Nancapsule Derived from Hyperbranched Polyethyleneimine (HPEI): Mechanism of Guest Encapsulation versus Molecular Parameters [J]. Macromolecules. 2009, 42 (5), 1533-1540 carried out). Take 0.79g of the dendritic amphiphile, and treat it with propylene oxide and acetic anhydride in turn (for details, see Feng Y.Y., Zhang X.X., Jin M., Wan D.C.DendriticAmphiphile-Decorated PolyHIPE as a Highly Efficient and Well RecyclableScavenger of Micropollutants in Water: Topological Effect [J].J.Poly.Sci., PartA:Poly.Chem.,2017,55(8),1294–1302), then the product was dissolved in chloroform (40mL), and potassium tetrachloroplatinate (0.12g ) and water (2 mL) and stirred for 0.5 h. Aqueous sodium borohydride (10ml, 0.06...

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Abstract

The invention relates to a precious metal nanoparticle supported porous material catalyst and a preparation method thereof. The catalyst comprises a porous carrier substrate and nano-composite particles supported on the porous carrier substrate, flexible polymers and rigid polymers are crosslinked to form the porous carrier substrate, the nano-composite particles comprise tree-like amphiphiles andprecious metal nanoparticles, the tree-like amphiphiles are supported on pore surfaces of the porous carrier substrate, and the precious metal nanoparticles are loaded on the tree-like amphiphiles. During preparation, the nano-composite particles serve as stabilizers, mixed oil phases of the flexible polymers, the rigid polymers and organic solvents serve as continuous phases, water serves as a disperse phase, and concentrated emulsion is formed and then solidified and washed to prepare the catalyst. Compared with the prior art, the porous material catalyst can be prepared in one-pot reactionthrough a concentrated emulsion polymerization method by making full use of amphipathy of the tree-like amphiphiles and precious metal nanoparticle hybrids, and the catalyst is large in size, high insurface area, good in mechanical strength and easy to separate and recycle.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and relates to a porous material catalyst loaded with noble metal nanoparticles and a preparation method thereof. Background technique [0002] Catalytic reactions are involved in the production process of most chemical products in the world, and heavy metal catalysts are commonly used catalysts in catalytic reactions. Because the heavy metal catalyst itself is relatively expensive, and the leakage of the heavy metal catalyst will affect the product purity and cause pollution to the environment, it is necessary to recycle the heavy metal catalyst. In recent years, zero-valent noble metal nanoparticles have attracted much attention due to their outstanding catalytic properties, but their further applications are limited due to their small size and inconvenient recycling. In order to facilitate the recovery of zero-valent noble metal nanoparticles, some scholars have used the loading m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J31/12B01J35/10B01J32/00B01J37/02
CPCB01J31/069B01J31/127B01J37/0072B01J37/0219B01J37/0228B01J35/398B01J35/23B01J35/613
Inventor 万德成潘海燕金明
Owner TONGJI UNIV
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