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Method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology

A carbon dioxide and supercritical technology, applied in the preparation of amino hydroxyl compounds, metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, etc., can solve the problem of affecting the quality of silver foam and catalytic performance, and affecting the quality of catalyst products Performance, difficult to obtain complex foam and other problems, to achieve good catalytic stability, maintain catalytic stability, and best marketing value

Active Publication Date: 2020-12-22
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the main disadvantage of the method disclosed above is that it is difficult to control the shape of the cells, and the size of the prepared cells is large and the distribution is uneven, so it is difficult to obtain PVA / AgNO with stable quality. 3 Composite foam, and then will affect the quality and catalytic performance of the silver foam that makes to a great extent; In addition, in order to make polyvinyl alcohol cross-linked and form gel network structure, include adding chemical cross-linking agent or developing in the above-mentioned technical scheme The technical content of the foaming agent, so the prepared silver foam inevitably has a certain amount of residue, which affects the quality of the catalyst and product performance

Method used

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  • Method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology
  • Method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology
  • Method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology, in parts by weight, comprises the following steps:

[0044] (1) Using 42 parts of silver nitrate (AgNO 3 ) and 100 parts of polyvinyl alcohol (PVA) were mixed and stirred for 60 hours. After the plasticization was complete, the mixed material obtained after plasticization was heated and melted, and the molding method was used to make it evenly mixed and shaped, and the prepared thickness was 2mm PVA / AgNO 3 Composite panels;

[0045] Wherein, the plasticizing system comprises the following components:

[0046] 60 parts of water,

[0047] 42 parts of silver nitrate;

[0048] (2) PVA / AgNO obtained in step (1) 3 Composite sheet prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain PVA / AgNO 3 Composite foam material, wherein the process parameters of the supercritical carbon dioxide autoclave pressure foaming method are: the foaming pro...

Embodiment 2

[0053] The method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology, in parts by weight, comprises the following steps:

[0054] (1) Using 100 parts of silver nitrate (AgNO 3 ) and 100 parts of polyvinyl alcohol (PVA) were mixed and stirred for 72 hours. After the plasticization was complete, the mixed material obtained after plasticization was heated and melted, and the molded method was used to mix it evenly and shape it. The prepared thickness was 2mm PVA / AgNO 3 Composite panels;

[0055] Wherein, the plasticizing system comprises the following components:

[0056] 60 parts of water,

[0057] 100 parts of silver nitrate;

[0058] (2) PVA / AgNO obtained in step (1) 3 Composite sheet prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain PVA / AgNO 3 Composite foam material, wherein the process parameters of the supercritical carbon dioxide autoclave pressure foaming method are: the foaming process pre...

Embodiment 3

[0064] The method for preparing foam silver catalyst based on supercritical carbon dioxide foaming technology, in parts by weight, comprises the following steps:

[0065] (1) Using 40 parts of silver nitrate (AgNO 3 ) and 100 parts of polyvinyl alcohol (PVA) were mixed and stirred for 48 hours. After the plasticization was complete, the mixed material obtained after plasticization was heated and melted, and the molding method was used to make it evenly mixed and shaped, and the prepared thickness was 1mm PVA / AgNO 3 Composite panels;

[0066] Wherein, the plasticizing system comprises the following components:

[0067] 40 parts of water,

[0068] 20 parts of ethylene glycol,

[0069] 40 parts of silver nitrate;

[0070] (2) PVA / AgNO obtained in step (1) 3 Composite sheet prepared by supercritical carbon dioxide autoclave pressure foaming method to obtain PVA / AgNO 3 Composite foam material, wherein the process parameters of the supercritical carbon dioxide autoclave pressur...

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Abstract

The invention provides a method for preparing a foam silver catalyst based on supercritical carbon dioxide foaming technology. The method first plasticizes and modifies polyvinyl alcohol and then uses a molding method to prepare PVA / AgNO. 3 Composite sheet, and then prepare PVA / AgNO through supercritical carbon dioxide autoclave foaming method 3 Composite foam material, the obtained composite foam material is subjected to in-situ solid-state reaction to obtain a foam silver catalyst. The present invention optimizes the cell structure by optimizing the combination of process conditions, thereby obtaining a silver foam catalyst with better catalytic efficiency and a certain mechanical strength after in-situ solid phase reaction. The foam silver catalyst prepared by this method has The foam pore size is evenly distributed, the product is pure, and the catalytic performance is significantly better than similar products on the market.

Description

technical field [0001] The invention belongs to the technical field of porous foamed metal catalysts, in particular to foamed silver catalysts, in particular to a method for preparing foamed silver catalysts based on supercritical carbon dioxide foaming technology. Background technique [0002] As the demand for metal lightweight materials has increased in recent years, the research on metal foams has become more and more extensive. Silver foam is a new type of functional material. Because it combines many characteristics of foam and metallic silver, it not only has the advantages of high porosity, low density, high specific surface area, but also has excellent antibacterial, electrical and thermal conductivity, etc. performance. Silver foam is widely used in the fields of catalysis, sensing, heat dissipation and heat storage, electromagnetic shielding, sound absorption and noise reduction, and antibacterial. Among them, the use of foamed silver as a catalyst has good prac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J35/02C07C213/02C07C215/76B01J35/00
CPCB01J23/50B01J37/0018C07C213/02B01J35/40C07C215/76
Inventor 白时兵袁斌王萌杨双桥江霞
Owner SICHUAN UNIV
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