Precious metal nanoparticle-modified porous carrier catalytic material and preparation method thereof

A porous carrier and catalytic material technology, applied in chemical instruments and methods, catalyst carriers, physical/chemical process catalysts, etc., can solve problems such as dropping, aging of nanoparticles, and poor performance of repeated use, and achieve convenient recycling and high efficiency The effect of high, few steps

Inactive Publication Date: 2015-08-05
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, in the preparation process of porous catalytic materials, the main shortcomings are: the efficiency of surface functionalization is not high enough; the interaction with metal nanoparticles is not strong enough, so tha...

Method used

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  • Precious metal nanoparticle-modified porous carrier catalytic material and preparation method thereof
  • Precious metal nanoparticle-modified porous carrier catalytic material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] PEI (1 gram, Aldrich company product, molecular weight 10000) and polystyrene (PS, 6 grams, molecular weight 7500) reaction synthesis amphiphile (synthesis can refer to open patent: 201410663000.x or according to literature Wan DC, Yuan JJ, Pu HT. Macromolecules 2009, 42, 1533). PEIPS was dissolved in chloroform (50 mL). Chlorauric acid (0.25 g) was then dissolved in a small amount of water (5 ml) and added to the above chloroform solution with stirring. Due to the acid-base complexation and automatic reduction of PEI and chloroauric acid, the unique red color of gold nanometers will be formed soon after the oil-water two-phase is mixed and stirred. Add inorganic desiccant sodium sulfate to dry the water, separate the liquid, and further centrifuge the obtained chloroform system or remove the chloroform by rotary evaporation, and collect the solid. The formation of gold nanometers was confirmed by ultraviolet / visible light spectroscopy, transmission electron microscop...

Embodiment 2

[0049] Prescription is substantially the same as embodiment 1 but preparation method is different. The oil phase is composed of styrene St, polyethylene glycol dimethacrylate (PEGDMA), toluene, AIBN initiator and PEIPS, and the specific volume composition is: St+PEGDMA:60% (St / PEGDMA=8:2), Toluene: 30%, PEIPS: 10%; AIBN: 1% of the mass of the oil phase. In addition, water equivalent to 8 times the volume of the oil phase (constituted by phosphate buffer solution (0.01M) solution, pH7.4) and chloroauric acid (formulation is the same as in Example 1) is dissolved in the water sample, and added dropwise to the Stir in the oil phase. Stirring was continued for several minutes after dropping, and the formed emulsion was placed in a convection heater at 70° C. for 12 hours. Wash with ethanol to obtain light brown rigid solid. The apparent density determined by the Archimedes method is 0.15 grams per milliliter. The scanning electron microscope energy spectrum characterization sh...

Embodiment 3

[0051] With embodiment 2, but replace chloroauric acid with silver nitrate and operate equally. The obtained porous carrier catalytic material is brown to light black. The scanning electron microscope energy spectrum characterization shows that the silver element is uniformly distributed on the surface and cannot be detected at all in the cross section.

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Abstract

The invention relates to a precious metal nanoparticle-modified porous carrier catalytic material and a preparation method thereof. The precious metal nanoparticle-modified porous carrier catalytic material comprises dendritic amphiphilic PEI@PS and precious metal M carried by the dendritic amphiphilic PEI@PS. The dendritic amphiphilic PEI@PS comprises a hydrophilic core PEI and an oleophylic shell PS chemically coating the hydrophilic core, and the precious metal M is one of Au, Pt, Ag and Pd. The preparation method comprises that the dendritic amphiphilic M@PEI@PS as a stabilizer, a vinyl monomer, a diene cross-linking agent, an initiator and a pore-foaming agent are mixed into an oil phase, the oil phase and water as a dispersant undergo thick water-in-oil emulsion polymerization reaction under the action of the initiator and the product is washed and dried, or comprises that the precious metal M is added into a water phase of a thick emulsion system adjusted by the dendritic amphiphilic PEI@PS, the mixture undergoes a polymerization reaction to produce a porous material and the porous material is reduced by a reducer. Compared with the existing catalytic material, the precious metal nanoparticle-modified porous carrier catalytic material has protruding stability and catalytic performances, has macroscopic dimension and can be easily separated from the reaction system and recycled.

Description

technical field [0001] The invention belongs to the technical field of catalytic materials, and relates to a noble metal nanoparticle-modified porous carrier catalytic material and a preparation method thereof. Background technique [0002] According to statistics, more than 60% of the world's chemical products need to involve catalytic reactions in the production process, and a considerable part of them are heavy metal catalysts. Due to several reasons, the recovery of heavy metal catalysts is very important: (1) the catalyst itself is relatively expensive; (2) the discharge of heavy metal catalysts will cause serious environmental pollution; (3) high-quality products such as pharmaceutical production should strictly prevent the presence of heavy metals. [0003] In recent years, metal nanomaterials technology is in a period of vigorous development, especially the successful synthesis of high-quality zero-valent noble metal particles with quantum confinement effects and the...

Claims

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Application Information

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IPC IPC(8): B01J31/26B01J31/28B01J32/00B01J35/10
Inventor 万德成叶永连
Owner TONGJI UNIV
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