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Preparation method of high-stability supported nano-silver catalyst

A supported, catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, separation methods, etc., can solve the problems of low catalytic activity, poor thermal stability, and inability to use Ag, and achieve high catalytic activity and thermal stability. Good performance, improve the effect of catalytic oxidation performance

Active Publication Date: 2020-04-10
SHENYANG NORMAL UNIV
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Problems solved by technology

[0006] In view of this, the present invention provides a method for preparing a highly stable loaded nano-silver catalyst, to at least solve the problems that Ag cannot be applied to the catalytic oxidation reaction of CO in the prior art, and there are problems such as low catalytic activity and poor thermal stability.

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  • Preparation method of high-stability supported nano-silver catalyst
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  • Preparation method of high-stability supported nano-silver catalyst

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preparation example Construction

[0038] The inventor has finally determined a new preparation method of nano-silver catalyst through a series of research and experiments, which can prepare a supported nano-silver catalyst with high catalytic activity and good thermal stability. The specific steps of the preparation method are as follows:

[0039] 1) A one-dimensional rod-shaped hydroxyapatite carrier is prepared by a one-step hydrothermal method;

[0040] 2) preparing and obtaining supported nano-silver catalyst by an equal volume impregnation method;

[0041] 3) heat-treating the supported nano-silver catalyst to obtain an Ag / HAP catalyst.

[0042] For the preparation of one-dimensional rod-shaped hydroxyapatite carriers, there are usually one-step hydrothermal method, coprecipitation method, microemulsion method, sol-gel method, etc., but the HAP nanorod carrier prepared by the one-step hydrothermal method not only has the same morphology as The structure is precise and controllable, and the product has hi...

Embodiment 1

[0063] At room temperature, dissolve 1.5114g of calcium nitrate and 0.5072g of diammonium hydrogen phosphate in 64mL of water, place on a magnetic stirrer to dissolve them all, then add 0.5376g of urea in a water bath at 60°C, stir for 30min, and then transfer the solution into In a 100mL stainless steel autoclave lined with polytetrafluoroethylene, heat at 160°C for 6 hours, then cool down to room temperature, centrifuge the white precipitated product, wash it with water three times, wash it with alcohol once until it is neutral, and place it in an oven at 50°C After drying, a mesoporous HAP material with a one-dimensional rod-like structure was obtained.

[0064] Such as figure 1 As shown, there is a relatively obvious HAP characteristic peak (No.09-0432), and the specific surface area of ​​the HAP sample is 78m 2 / g, HAP mesoporous nanorods have a diameter of 50-80nm and a length of 400-600nm, see figure 2 , image 3 .

Embodiment 2

[0066] At room temperature, dissolve 1.5114g of calcium nitrate and 0.5072g of diammonium hydrogen phosphate in 64mL of water, place on a magnetic stirrer to dissolve them all, then add 0.1537g of urea in a water bath at 60°C, stir for 30min, and then transfer the solution into In a 100mL stainless steel autoclave lined with polytetrafluoroethylene, heat at 160°C for 6 hours, then cool down to room temperature, centrifuge the white precipitated product, wash it with water three times, wash it with alcohol once until it is neutral, and place it in an oven at 50°C After drying, a HAP material with a one-dimensional short rod-like structure is obtained.

[0067] Such as Figure 4 As shown, the HAP nanorods have a diameter of 40-60 nm and a length of 100-150 nm.

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Abstract

The invention discloses a preparation method of a high-stability supported nano-silver catalyst. According to the preparation method, a hydroxyapatite carrier with a one-dimensional rod-like structureis prepared through a one-step hydrothermal method, and then, the supported nano-silver catalyst is prepared through an isopyknic impregnation method. With the aid of the protection effect of hydroxyl on the surface of the HAP nanorod carrier, the dispersion degree and the thermal stability of active center silver are remarkably improved. The interaction force between the HAP nanorod carrier andan active component Ag is regulated and controlled by carrying out thermal treatment on the prepared supported nano-silver catalyst, and then the catalytic oxidation performance of CO is improved. Thepreparation method has the advantages of simple synthesis method, high universality and the like, and the prepared nano-silver catalyst has the advantages of high catalytic activity, good thermal stability and the like.

Description

technical field [0001] The disclosure of the invention relates to the technical field of catalyst preparation, in particular to a preparation method of a highly stable loaded nano-silver catalyst. Background technique [0002] Carbon monoxide (CO) is a colorless, non-irritating odorous poisonous gas. The CO produced by incomplete combustion of coal and vehicle exhaust has caused extremely serious impacts on people's nature and living environment. It is One of the most widespread and abundant pollutants in the atmosphere. Therefore, the elimination of CO has great practical significance. At present, the elimination of CO is mainly carried out by CO catalytic oxidation, and the catalysts used in the CO catalytic oxidation process mainly include platinum (Pt), palladium (Pd), rhodium (Rh), ruthenium (Ru), gold (Au) and iridium (Ir) and other noble metal catalysts, resulting in higher cost of the catalytic oxidation reaction of CO, which is not conducive to popularization and ...

Claims

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Application Information

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IPC IPC(8): B01J27/18B01J35/02B01D53/86B01D53/62
CPCB01J27/1817B01D53/864B01J35/40Y02A50/20
Inventor 苗雨欣赵震刘星遇兰玉婷于娇
Owner SHENYANG NORMAL UNIV
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