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Preparation method of silicon dioxide/nickel core-shell nano-structure material

A nanostructure, silica technology, applied in chemical instruments and methods, microsphere preparation, metal/metal oxide/metal hydroxide catalysts, etc. Expensive and other problems, to avoid the use of precious metals and toxic reagents, controllable performance, and low cost

Active Publication Date: 2020-03-31
杭州钦宁科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Moreover, the method of first sensitizing activation and then reducing is a common method in the current research field to deposit nickel particles on the surface of the carrier. This method needs to first adsorb noble metal nanoparticles on the silicon surface and then catalyze the reduction of nickel, but the yield of noble metal nanoparticles is very low. Very expensive and not suitable for commercial applications

Method used

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  • Preparation method of silicon dioxide/nickel core-shell nano-structure material
  • Preparation method of silicon dioxide/nickel core-shell nano-structure material
  • Preparation method of silicon dioxide/nickel core-shell nano-structure material

Examples

Experimental program
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Effect test

Embodiment 1

[0048] (1) Preparation of solution A: 24.75 mL of deionized water, 16.25 mL of absolute ethanol and 9 mL of 28% concentrated ammonia were mixed under magnetic stirring conditions;

[0049] Preparation of solution B: Mix 4.5mL of tetraethyl orthosilicate and 45.5mL of absolute ethanol under the condition of magnetic stirring;

[0050] Add solution B to solution A quickly and mix, stir at high speed for one minute, then reduce the speed and react at room temperature for two hours. After the reaction was completed, the suspension was centrifuged three times with absolute ethanol, and then dried in a vacuum oven at 80°C to obtain white SiO 2 The microspheres are reserved, denoted as SiO 2 .

[0051] (2) SiO prepared in step (1) 2 The mass ratio of microspheres is 1:100 (SiO 2 : water) ratio dissolved in deionized water, so that SiO 2 The microspheres are evenly dispersed, adjusted to pH=7 with dilute hydrochloric acid, and then according to 40:1 (SiO 2 : PDDA) mass ratio int...

Embodiment 2

[0078] (1) adopt the SiO prepared in embodiment 1 2 Microspheres;

[0079] (2) SiO 2 The mass ratio of microspheres is 1:100 (SiO 2 : water) ratio dissolved in deionized water, so that SiO 2 Disperse evenly, use dilute hydrochloric acid to adjust pH = 7, and then follow the 50:1 (SiO 2 : The mass ratio of PDDA) was added to the PDDA solution, magnetically stirred for 10 min, washed with centrifugal water for 3 times and then dried;

[0080] (3) SiO after processing in step (2) 2 According to the mass ratio of 1:100 (SiO 2 : water) ratio dissolved in deionized water, so that SiO 2 Disperse evenly, use dilute hydrochloric acid to adjust pH = 7, and then follow the 40:1 (SiO 2 : The mass ratio of PSS) is added to the PSS solution, magnetically stirred for 10 min, dried after centrifugal washing for 3 times;

[0081] (4) get SiO after processing in step (3) 2 According to SiO 2 : nickel sulfate hexahydrate: sodium citrate: lactic acid: water=3:20:42:40:8000 (mass ratio) ...

Embodiment 3

[0085] (1) adopt the SiO prepared in embodiment 1 2 Microspheres;

[0086] (2) SiO 2 The mass ratio of microspheres is 1:100 (SiO 2 : the ratio of water) is dissolved in deionized water, and the SiO 2 Disperse evenly, use dilute hydrochloric acid to adjust pH=7, then follow 60:1 (SiO 2: The mass ratio of PDDA) was added to the PDDA solution, magnetically stirred for 10 min, washed with centrifugal water for 3 times and then dried;

[0087] (3) SiO after processing in step (2) 2 According to the mass ratio of 1:100 (SiO 2 : water) ratio dissolved in deionized water, so that SiO 2 Disperse evenly, use dilute hydrochloric acid to adjust pH = 7, and then follow the 50:1 (SiO 2 : The mass ratio of PSS) is added to the PSS solution, magnetically stirred for 10 min, dried after centrifugal washing for 3 times;

[0088] (4) get SiO after processing in step (3) 2 According to SiO 2 : nickel sulfate hexahydrate: sodium citrate: lactic acid: water=7:85:8:20:4000 (mass ratio) is...

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Abstract

The invention discloses a preparation method of a silicon dioxide / nickel core-shell nano-structure material. The preparation method comprises the following steps: preparing SiO2 microspheres, dispersing the SiO2 microspheres in water, mixing the SiO2 microspheres with cationic polyelectrolyte to obtain positively charged SiO2 microspheres after modification, dispersing the positively charged SiO2microspheres in water, mixing the positively charged SiO2 microspheres with an anionic polyelectrolyte to obtain negatively charged SiO2 microspheres after modification, mixing the negatively chargedSiO2 microspheres, a soluble salt of nickel, sodium citrate, lactic acid and water, uniformly stirring the materials, adding a reducing agent into the mixture, and reducing the mixture to obtain the silicon dioxide / nickel core-shell nano-structure material. According to the preparation method, the surface of silicon dioxide does not need an activating treatment process, the process is simple, theperformance is controllable, the production period is short, the production energy consumption is greatly reduced, and the preparation method is suitable for large-scale industrial production. In thefinally prepared product, the nickel content and the thickness of the nickel shell are adjustable and the purity of the nickel coating is high.

Description

technical field [0001] The invention relates to the technical field of silicon dioxide materials, in particular to a method for preparing a silicon dioxide / nickel core-shell nanostructure material. Background technique [0002] Metallic nickel-based catalyst is a common catalytic material, which has a good effect in the hydrogenation reaction of polymers with unsaturated bonds such as olefins and aromatic hydrocarbons, and is widely used in petroleum, pharmaceutical and other fields. Nickel-based catalysts use surface active sites to contact reactants to carry out catalytic reactions. The smaller the particles of metallic nickel, the larger the specific surface area and the higher the catalytic efficiency. The industry wants to prepare metallic nickel with a smaller size, but nickel itself is magnetic, and the particles attract each other and tend to grow up and agglomerate during the preparation process, making the preparation of small-sized nickel metal more difficult. Ni...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/755B01J13/02
CPCB01J23/755B01J13/02
Inventor 张亚光杜宁赵立旸戎华蒋经纬
Owner 杭州钦宁科技有限公司
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