Process for producing platinum metal nano-particle for catalysis with polymer microsphere as carrier

A technology of polymer microspheres and nanoparticles, which is applied in the field of polymer materials and metal nanocatalytic materials, can solve the problems of reducing the application range of materials, and achieve the effects of preventing aggregation, good reusability, and high specific surface area

Inactive Publication Date: 2008-07-16
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, many methods of preparing metal nano / polymer composite materials focus on the preparation of metal nanoparticles, and the selected polymer is only to take advantage of its basic processing and forming properties, which greatly reduces the cost of this material. The range of application of the material

Method used

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  • Process for producing platinum metal nano-particle for catalysis with polymer microsphere as carrier
  • Process for producing platinum metal nano-particle for catalysis with polymer microsphere as carrier

Examples

Experimental program
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Effect test

Embodiment 1

[0027] The first step: Add styrene-terminated poly-N-isopropylacrylamide 0.195mmol (8g) successively in a 50mL reactor at room temperature, and the number-average molecular weight of poly-N-isopropylacrylamide (PNIPAAm) macromonomer Mn=4×10 3 g / mol; styrene 4.5mmol (0.47g), acrylonitrile 15mmol (0.8g), azobisisobutyronitrile 0.195mmol (0.03mg), ethanol / water (volume ratio 7 / 3) mixed medium 25mL, ultrasonic Vibrate to fully dissolve the mixed solution, repeat three cycles of refrigerated vacuum and thawing, or continuously pass high-purity nitrogen gas for 30 minutes, then seal the reactor, stir at 60°C or keep the oscillation frequency at 160rpmin, and react for 22 hours. Take out the reactor, centrifuge the reaction solution, redisperse it in the water medium, further dialysis and purify in the cellulose dialysis membrane to remove impurities such as unreacted monomers, and freeze-dry to obtain polymer microspheres with special morphology on the surface.

[0028] The second ...

Embodiment 2

[0032] The first step: Add 0.195 mmol (1.3 g) of styrene-terminated poly-N-vinylacetamide successively in a 50 mL reactor at room temperature, and the number-average molecular weight of the poly-N-vinylacetamide (PNVA) macromer is Mn=6×10 3 g / mol; styrene 4.5mmol (0.5g), acrylonitrile 15mmol (0.8g), azobisisobutyronitrile 0.195mmol (0.03g), ethanol / water (volume ratio 7 / 3) mixed medium 25mL, ultrasonic Vibrate to fully dissolve the mixed solution, repeat three cycles of refrigerated vacuum and thawing or continue to pass high-purity nitrogen gas for 30 minutes, then seal the reactor, stir at 60°C or keep the oscillation frequency at 160rpmin, and react for 24 hours. Take out the reactor, centrifuge the reaction solution, redisperse it in the water medium, further dialysis and purify in the cellulose dialysis membrane to remove impurities such as unreacted monomers, and freeze-dry to obtain polymer microspheres with special morphology on the surface.

[0033] Step 2: Weigh 0.0...

Embodiment 3

[0037] Step 1: Add 0.195 mmol (1.0 g) of styrene-terminated polyacrylamide to a 50 mL reactor at room temperature, and the number-average molecular weight of the polyacrylamide (PAM) macromonomer is Mn=5×10 3 g / mol; styrene 4.5mmol (0.5g), acrylonitrile 15mmol (0.8g), azobisisobutyronitrile 0.195mmol (0.03Gg), ethanol / water (volume ratio 7 / 3) mixed medium 25mL, ultrasonic Vibrate to fully dissolve the mixed solution, repeat three cycles of refrigerated vacuum and thawing or continue to pass high-purity nitrogen gas for 30 minutes, then seal the reactor, stir at 60°C or keep the oscillation frequency at 160rpmin, and react for 26 hours. Take out the reactor, centrifuge the reaction solution, redisperse it in the water medium, further dialysis and purify in the cellulose dialysis membrane to remove impurities such as unreacted monomers, and freeze-dry to obtain polymer microspheres with special morphology on the surface.

[0038] Step 2: Weigh 0.0018mmol (0.1g) of the special-fo...

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Abstract

The invention relates to a preparation method of catalytic platinum metal nano particles using polymeric microspheres as a carrier, pertaining to technological field of polymer material and metal nano catalytic material. The invention can synthesize a special type of terpolymer polymeric microspheres of polyamide macro-molecular monomer ingrafted acrylonitrile / styrene through dispersion copolymerization; the catalyst can utilize soluble platinic acid as a source of platinum, and in-situ reduce platinum metal ions into platinum atoms on the surfaces of polymeric microspheres through the complexation reaction between platinum metal ion and a acidamide group, while the acidamide group is located at a hydrophilic polyamide long train of the surface of polymeric microspheres; the polymeric microspheres can be continuously grown and form into stable platinum metal nano particles using polymeric microspheres as the carrier, with the platinum particle diameter be controlled between 2 to 50nm and uniformly dispersed on the surfaces of the polymeric microspheres. The preparation process of the invention has moderate reaction conditions, simply and easily carried method, and the prepared platinum metal nano particles can be used as the catalyst of various chemical reaction.

Description

technical field [0001] The invention discloses a preparation method of platinum metal nanoparticles for catalysis with polymer microspheres as the carrier, belonging to the technical field of polymer materials and metal nano-catalysis materials. Background technique [0002] Platinum metal nanoparticles have a large specific surface area and have surface effects, small size effects, quantum size effects, and macroscopic quantum tunneling effects, which make platinum metal nanoparticles have better catalytic performance than macroscopic substances. Catalysts with important chemical reaction efficiency can be used in the polymerization of monomers, hydrogenation reactions, degradation of organic waste, treatment of waste gas and wastewater, and purification of the environment. They are widely used in fuel cells, petrochemicals, and automobile exhaust purification. However, due to the large specific surface area of ​​platinum metal nanoparticles, they have high activity, are ea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/06B01J31/28C08F4/26C08F4/02
Inventor 陈明清封姣倪忠斌刘晓亚熊万斌
Owner JIANGNAN UNIV
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