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Nuclear shell nanometer catalyst packaged with noble metal nanometer grains and method thereof

A nano-catalyst and nano-particle technology, applied in metal/metal oxide/metal hydroxide catalysts, chemical instruments and methods, catalyst activation/preparation, etc., can solve the problems of poor catalyst stability, chemical affinity mismatch, easy Agglomeration and other issues

Inactive Publication Date: 2010-01-13
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of the present invention is to aim at the poor stability of supported noble metal nano catalysts, easy aggregation and growth, loss of noble metal elements during use, and chemical affinity mismatch between noble metal nanomaterials and silicon dioxide, so far no less than Insufficient core-shell structure of 10nm-sized noble metal particles provides a noble metal particle size less than 10nm, mutual contact between noble metal particles, high stability of the catalyst, which can ensure the recycling of the catalyst, and can be adapted to different Core-shell nanocatalyst wrapped noble metal nanoparticles and preparation method thereof under conditions of use

Method used

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  • Nuclear shell nanometer catalyst packaged with noble metal nanometer grains and method thereof
  • Nuclear shell nanometer catalyst packaged with noble metal nanometer grains and method thereof
  • Nuclear shell nanometer catalyst packaged with noble metal nanometer grains and method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0086] Example 1: Making 2%Pd@SiO 2 (Spherical) Core-shell Nanocatalysts

[0087] Weigh 15.2mg of palladium acetylacetonate, measure 0.75ml of oleylamine, 0.25ml of oleic acid, 50ul of triphenylphosphine and 2ml of diphenyl ether solution, stir well, put it into a microwave reactor, react at 180°C for 1h, and take out the sample Wash with absolute ethanol, dissolve with cyclohexane (such as figure 1 ). Weigh 35mg of iron acetylacetonate, measure 1.5ml of oleylamine, 1.1ml of oleic acid and 10ml of n-octanol solution, put them into a three-necked bottle, heat to 80°C for 1h, draw a vacuum, replenish nitrogen several times, Heated to 180°C in medium temperature, maintained for 2h, cooled to room temperature, washed with absolute ethanol, and then dissolved in an appropriate amount of cyclohexane solution (such as figure 2 ). Weigh 4.672g Brij56 and dissolve in 20ml cyclohexane, measure 0.2ml deionized water, then stir overnight, measure 0.7ml ammonia water and stir for 0.5h...

Embodiment 2

[0089] Example 2: Making 1.3%Pd@SiO 2 (Spherical) Core-shell Nanocatalysts

[0090] Weigh 10mg palladium acetylacetonate, measure 0.5ml oleylamine, 0.2ml oleic acid, 10ul triphenylphosphine and 2ml diphenyl ether solution, stir evenly, put it into a microwave reactor, react at 180°C for 1h, take out the sample for Wash with absolute ethanol and dissolve with cyclohexane. Weigh 20mg of iron acetylacetonate, measure 1.5ml of oleylamine, 1.1ml of oleic acid and 10ml of n-octanol solution, put them into a three-necked bottle, heat to 80°C for 1h, draw a vacuum and replenish nitrogen several times, Heated to 180°C in medium temperature, maintained for 2h, cooled to room temperature, washed with absolute ethanol, and then dissolved in an appropriate amount of cyclohexane solution. Weigh 4.672g Brij56 and dissolve in 20ml cyclohexane, measure 0.2ml deionized water, then stir overnight, measure 0.7ml ammonia water and stir for 0.5h, then measure 1.5ml tetraethoxysilane, heat to 50°C...

Embodiment 3

[0091] Example 3: Making 4%Pd@SiO 2 (Spherical) Core-shell Nanocatalysts

[0092] Weigh 30mg of palladium acetylacetonate, measure 3ml of oleylamine, 1ml of oleic acid, 200ul of triphenylphosphine and 5ml of diphenyl ether solution, stir well and put it in a microwave reactor, react at 180°C for 2h, take out the sample with anhydrous Wash with ethanol and dissolve with cyclohexane. Weigh 70mg of iron acetylacetonate, measure 1.5ml of oleylamine, 1.1ml of oleic acid and 10ml of n-octanol solution, put them in a three-necked bottle, heat to 80°C for 1h, draw vacuum, supplement nitrogen several times, Heated to 180°C in medium temperature, maintained for 2h, cooled to room temperature, washed with absolute ethanol, and then dissolved in an appropriate amount of cyclohexane solution. Weigh 4.672g Brij56 and dissolve in 20ml cyclohexane, measure 0.2ml deionized water, then stir overnight, measure 0.7ml ammonia water and stir for 0.5h, then measure 1.5ml tetraethoxysilane, heat to...

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Abstract

The invention relates to a nuclear shell nanometer catalyst packaged with noble metal nanometer grains and a method thereof, which relate to a nanometer catalyzing material. The invention provides a nuclear shell nanometer catalyst packaged with noble metal nanometer grains, which has a size of the noble metal grains less than 10nm, and higher contact level among noble metal grains and stability of the catalyst, can be reused and is adaptive to different using conditions by multi-level derivation, and also provides a preparation method thereof. The catalyst has a formula of NMP@X, NMP is nanometer grains such as Pd, AgPd or Au, and the like, and X is spherical SiO2, hollow SnO2 ball or hollow C ball. The method comprises the following steps: synthesizing noble metal nanometer grains and adorning the surface to obtain noble metal-iron oxide nanometer heterojunction; coating a silicon dioxide to obtain noble metal iron heterojunction oxide @ silicon dioxide nuclear shell nanometer material, growing porous pores on the surface, removing the silicon dioxide, and removing iron oxide on the noble metal nanometer grains so that the noble metal nanometer grains are located in a nanometer capsule of the hollow porous pores to obtain the product.

Description

technical field [0001] The invention relates to a nano catalytic material, in particular to a core-shell nano catalyst wrapped with noble metal nano particles and a method thereof. Background technique [0002] Precious metals (including gold, silver, platinum, palladium, etc.) are good catalyst materials and have become the objects of social concern. Gold was considered to be a chemically inert substance for a long time and was thus ignored. Since Haruta (M.Haruta, N.Yamada, T.Kobayashi, S.Iijima Gold catalysts prepared by coprecipitation for low-temperature oxidation of hydrogen and of carbon monoxide. Journal of Catalysis, 1989.115 (2): 301-309) etc. in In the 1980s, after discovering that the CO oxidation reaction of gold nano-loaded materials had a high-efficiency catalytic function at low temperature, Goodman (A.Kolmakov, D.W.Goodman Scanning tunneling microscopy of gold clusters TiO 2 (110): CO oxidation at elevated pressures. Surface Science. 2001.490 (1): 597-601)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/62B01J23/66B01J23/52B01J35/10B01J37/00
Inventor 郑南峰黄枊军陈诚张海
Owner XIAMEN UNIV
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