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Method for preparing supported precious metal/zinc oxide hybrid nanometer materials

A technology of zinc oxide nano- and hybrid materials, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of easy migration of active metal components, catalysts Problems such as poor metal dispersion and low activity specific surface area can achieve the effect of uniform and stable loading, high catalytic activity and large active surface area

Inactive Publication Date: 2016-06-29
SHENYANG PHARMA UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

After impregnation, it is difficult to form a strong interaction between the metal salt species and the catalyst support, and the active metal components are prone to migration and further agglomeration during the subsequent calcination and reduction process, resulting in poor dispersion of catalyst metals and low activity specific surface area. low, resulting in poor catalytic performance

Method used

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  • Method for preparing supported precious metal/zinc oxide hybrid nanometer materials
  • Method for preparing supported precious metal/zinc oxide hybrid nanometer materials
  • Method for preparing supported precious metal/zinc oxide hybrid nanometer materials

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] This example aims to illustrate the feasibility of preparing the supported Pd / ZnO hybrid nanomaterial of the present invention.

[0035] (1) Preparation of reaction precursor: Take 10ml N-N dimethylformamide with a pipette gun and place it in a beaker, then add 2ml distilled water to the beaker, weigh 3mg palladium acetylacetonate (Pd(acac) 2 ) into a beaker, and then weighed 60mg of zinc acetylacetonate (Zn(acac) 2 ) into the beaker, and then weighed 100mg of polyvinylpyrrolidone (PVP) into the beaker, and finally added NaOH solution to adjust its pH value, and placed the beaker on a magnetic stirrer to stir for 30 minutes to fully dissolve the reaction precursor.

[0036] (2) Implementation of hydrothermal reaction: move the mixed solution to the polytetrafluoroethylene reaction kettle lining, put the kettle lining into the reaction kettle and tighten it, set the oven temperature to 140°C, put the reaction kettle in the oven, and keep the temperature constant React f...

Embodiment 2

[0039] This example aims to illustrate the feasibility of preparing the supported Pt / ZnO hybrid nanomaterial of the present invention.

[0040] (1) Preparation of the reaction precursor: Take 10ml of N-N dimethylformamide with a pipette gun and place it in a beaker, then add 2ml of distilled water to the beaker, weigh 3mg of platinum acetylacetonate (Pt(acac) 2 ) into a beaker, and then weighed 60mg of zinc acetylacetonate (Zn(acac)2 ) into the beaker, and then weighed 100mg of polyvinylpyrrolidone (PVP) into the beaker, and finally added NaOH solution to adjust its pH value, and placed the beaker on a magnetic stirrer to stir for 30 minutes to fully dissolve the reaction precursor.

[0041] (2) Implementation of hydrothermal reaction: move the mixed solution to the polytetrafluoroethylene reaction kettle lining, put the kettle lining into the reaction kettle and tighten it, set the oven temperature to 140°C, put the reaction kettle in the oven, and keep the temperature constan...

Embodiment 3

[0044] This example aims to characterize the supported Pd / ZnO and Pt / ZnO hybrid nanomaterials in the present invention.

[0045] Comprehensive physical properties: Take the supported Pd / ZnO and Pt / ZnO nano-hybrid materials prepared in Example 1 and Example 2, and analyze the overall performance of the composite nano-materials by scanning electron microscope, transmission electron microscope and X-ray diffractometer. Morphology, Pd or Pt loading, crystal form, etc. were characterized.

[0046] By changing the amount of NaOH solution in the reaction (NaOH solution is 0 μL, 200 μL, 1700 μL and 2500 μL), the morphology of the carrier ZnO can be continuously adjusted in nanotube shape, dandelion flower shape, stacked star shape, and burr lamination (such as figure 1 and 3 shown). According to transmission electron microscopy results (such as figure 2 and 4 As shown), it can be seen that the loading capacity of Pd or Pt is relatively large, and the particles are evenly disperse...

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Abstract

The invention provides a method for preparing supported precious metal / zinc oxide hybrid nanometer materials, and belongs to the technical field of composite materials. The method includes supporting precious metal (mainly including palladium and platinum) on semiconductor zinc oxide in an in-situ manner by the aid of a one-step hydrothermal process. The method has the advantages that the method is simple and is low in energy consumption and high in efficiency; the supported precious metal / zinc oxide hybrid nanometer materials which are composite materials are novel in structure, experimental conditions can be changed, accordingly, the morphology of the zinc oxide which is a carrier can be adjusted, precious metal particles with small sizes can be uniformly dispersed on the carrier without agglomeration, the supported precious metal / zinc oxide hybrid nanometer materials are high in capacity, and the metal nanometer particles can intensely interact with the zinc oxide which is the carrier; as shown by experimental results, the dispersion of the Pd nanometer particles can be improved after the Pd nanometer particles are supported on the ZnO carrier in the in-situ manner, the reaction areas can be increased, and the catalytic reaction efficiency can be improved; particles of catalysts are enlarged after being supported and accordingly can be easily centrifugally recycled, the recycling performance of the Pd catalysts can be greatly improved, and the method is favorable for industrial production and market promotion of the precious metal catalysts in the aspect of Suzuki catalysis.

Description

technical field [0001] The invention relates to a preparation method of a supported noble metal / zinc oxide hybrid nano material and its catalytic application, belonging to the technical field of nano composite materials. Background technique [0002] The preparation and performance research of metal-oxide hybrid nanomaterials is a frontier topic in the field of materials today. Noble metal-metal oxide composite systems are widely used in catalytic reactions due to their special contact interface and chemical and electronic properties. The synergistic effect between metals and oxides can improve the properties of each component in hybrid nanomaterials. As a type of metal-metal oxide hybrid materials, supported metal catalysts have high activity, selectivity and stability. Metals with catalytic activity are loaded on supports such as alumina, activated carbon and silica. The metal can be highly dispersed in the form of crystallites on the surface of the support, resulting in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/60B82Y30/00B82Y40/00C07C15/14C07C1/32
Inventor 包志红刘洪卓杨杨
Owner SHENYANG PHARMA UNIVERSITY
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