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Preparation method of flaky hydroxyapatite carrier and preparation method of supported nano-silver catalyst

A technology of hydroxyapatite and carrier, applied in chemical instruments and methods, physical/chemical process catalysts, inorganic chemistry, etc., can solve the problems of poor thermal stability, uncontrollable shape, and amorphous structure of supported nano-silver catalysts , to achieve low raw material prices, improve catalytic performance, and enhance the effect of anchoring

Active Publication Date: 2020-04-24
SHENYANG NORMAL UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In view of this, the present invention discloses a method for preparing a flaky hydroxyapatite carrier and a loaded nano-silver catalyst, to at least solve the problem of using the co-precipitation method in the past As well as the hydroxyapatite prepared by the sol-gel method, the amorphous structure, the uncontrollable shape and other problems, as well as the poor thermal stability and low activity of the supported nano-silver catalyst

Method used

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  • Preparation method of flaky hydroxyapatite carrier and preparation method of supported nano-silver catalyst
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  • Preparation method of flaky hydroxyapatite carrier and preparation method of supported nano-silver catalyst

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Embodiment 1

[0060] At room temperature, (1) Dissolve 1.6130g of sodium hydroxide and 4.2028g of citric acid in 20mL of water and place on a magnetic stirrer to dissolve them all; (2) Dissolve 2.365g of calcium nitrate in 20mL of water and place on a magnetic stirrer Put it on the stirrer, dissolve it and pour it into (1); (3) dissolve 0.7923g of diammonium hydrogen phosphate in 28mL of water, pour it into the mixture of (1) and (2), then add 3.0300g in a water bath at 30°C Urea, stirred for 30min, then moved the solution into a 100mL stainless steel autoclave with polytetrafluoroethylene lining, heated it in water at 160°C for 12h, then lowered to room temperature, centrifuged the white precipitated product, washed three times with water, and washed once with alcohol until Neutral, dried in an oven at 50°C to obtain a HAP material with a two-dimensional sheet structure.

[0061] Such as figure 1 As shown, the synthesized HAP nanosheets have obvious HAP characteristic peaks (No.09-0432), ...

Embodiment 2

[0063] At room temperature, (1) Dissolve 1.6130g of sodium hydroxide and 4.2028g of citric acid in 20mL of water and place on a magnetic stirrer to dissolve them all; (2) Dissolve 2.365g of calcium nitrate in 20mL of water and place on a magnetic stirrer Put it on the stirrer, dissolve it and pour it into (1); (3) dissolve 0.7923g of diammonium hydrogen phosphate in 28mL of water, pour it into the mixture of (1) and (2), then add 3.0300g in a water bath at 30°C Urea, stirred for 30min, then moved the solution into a 100mL stainless steel autoclave with polytetrafluoroethylene lining, heated it with water at 180°C for 12h, then lowered to room temperature, centrifuged the white precipitated product, washed three times with water, and washed once with alcohol until Neutral, dried in an oven at 50°C to obtain a HAP material with a two-dimensional sheet structure.

[0064] Such as Figure 4 As shown, the size of the synthesized HAP nanosheets is irregular and increased, and the t...

Embodiment 3

[0066] At room temperature, (1) Dissolve 2.4198g of sodium hydroxide and 6.3042g of citric acid in 20mL of water and place on a magnetic stirrer to dissolve them all; (2) Dissolve 2.365g of calcium nitrate in 20mL of water and place on a magnetic stirrer Put it on the stirrer, dissolve it and pour it into (1); (3) dissolve 0.7923g of diammonium hydrogen phosphate in 28mL of water, pour it into the mixture of (1) and (2), then add 3.0300g in a water bath at 30°C Urea, stirred for 30min, then moved the solution into a 100mL stainless steel autoclave with polytetrafluoroethylene lining, heated it with water at 180°C for 12h, then lowered to room temperature, centrifuged the white precipitated product, washed three times with water, and washed once with alcohol until Neutral, dried in an oven at 50°C to obtain a HAP material with a two-dimensional sheet structure.

[0067] Such as Figure 5 As shown, the synthesized HAP nanosheets are larger in size with a thickness of 100-150 nm...

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Abstract

The invention discloses a preparation method of a flaky hydroxyapatite carrier and a preparation method of a supported nano-silver catalyst. The preparation method of the flaky hydroxyapatite carriercomprises the following steps: preparing the flaky hydroxyapatite (HAP) carrier in one step by an in-situ growth method through using a hydrothermal reaction, and accurately controlling the HAP flakesize and thickness by adding citric acid and matching with a proper reaction temperature in order to prepare the hydroxyapatite carrier with a stable structure. The preparation method of the carrier is simple in process and low in raw material price and can be used for large-scale production. In the preparation method of the supported nano-silver catalyst, the supported nano-silver catalyst is prepared by an impregnation method through taking hydroxyapatite with a two-dimensional flake structure as the carrier, and the dispersity and the thermal stability of active component Ag nano-particlesare remarkably improved by virtue of the confinement effect of the hydroxyapatite carrier and the protection effect of hydroxyl groups on the surface of the carrier on the silver (Ag) nano-particles.

Description

technical field [0001] The disclosure of the invention relates to the technical field of catalyst preparation, in particular to a method for preparing a sheet-shaped hydroxyapatite carrier and a supported nano-silver catalyst. Background technique [0002] In the heterogeneous reaction process of CO catalytic oxidation, the commonly used catalysts are noble metal catalysts, mainly including: platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), gold (Au) and iridium (Ir). etc. There are also attempts to use silver (Ag) as a catalyst. However, no matter it is a noble metal catalyst or an Ag catalyst, it is prepared by loading on a carrier. [0003] The molecular formula of Hydroxyapatite (HAP) is Ca 10 (PO 4 ) 6 (OH) 2 , its composition and structure make it have strong ion exchange, and can adjust its acidity and alkalinity by adjusting the ratio of calcium and phosphorus, and its surface is rich in hydroxyl groups so that hydroxyapatite can be modified by other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J27/18C01B32/50
CPCB01J27/1817C01B32/50B01J35/394Y02A50/20
Inventor 苗雨欣赵震兰玉婷刘雯雯于娇
Owner SHENYANG NORMAL UNIV
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