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Industrialization preparation of sphere-like porous silver powder

A porous silver and spherical-like technology, applied in the field of porous metal materials, can solve the problems of small effective reaction surface area, short service life, high service life, etc., and achieve the effect of easy control, high yield and no pollution

Inactive Publication Date: 2008-09-17
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The electrolytic silver catalyst has high selectivity and conversion rate, but it is easy to be poisoned and has a short service life; the selectivity and conversion rate of pumice silver are not as good as electrolytic silver, but its anti-toxicity is worse than electrolytic silver, and its service life is long
The main defects of existing catalysts are: (1) low porosity; (2) small effective reaction surface area; (3) poor heat resistance, etc.

Method used

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  • Industrialization preparation of sphere-like porous silver powder
  • Industrialization preparation of sphere-like porous silver powder
  • Industrialization preparation of sphere-like porous silver powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] 50 g silver carbonate Ag 2 CO 3 The raw material is dissolved in 950 ml of ammonia solution with a concentration of 5wt.%, spray-dried in an air atmosphere, the flow rate of the solution is 1000 ml / hour, the flow rate of the carrier gas is 0.28 MPa, the air inlet temperature is controlled at 280 ° C, and the air outlet temperature is controlled at 180 ° C The precursor powder of the quasi-spherical porous silver powder is made; the precursor powder of the obtained quasi-spherical porous silver powder is placed in an alumina crucible, calcined under an air atmosphere, the calcining temperature is 400 ° C, and the calcining time is 40 minutes. The calcining process is: First, the temperature was raised to 100°C at a heating rate of 5°C / min, and kept for 10 minutes; the temperature was raised from 100°C to 150°C at a heating rate of 2°C / min, and kept for 30 minutes; Raise the temperature to 200°C and keep it warm for 10 minutes; raise the temperature from 200°C to 260°C a...

Embodiment 2

[0038] 62 g silver nitrate AgNO 3 Prepared into a solution and reacted with an appropriate amount of sodium carbonate to prepare Ag 2 CO 3 Raw materials, after fully reacting, carry out suction filtration and washing to obtain Ag 2 CO 3 Raw material, it is dissolved in 950ml concentration and is 20wt.% ammonia solution, spray drying in air atmosphere, solution flow rate is 400 ml / hour, carrier gas flow rate 0.32MPa, air inlet temperature is controlled at 250 ℃, air outlet temperature is controlled at 120 ℃ to make the precursor powder of spherical porous silver powder; put the obtained spherical porous silver powder precursor powder in an alumina crucible, and calcined under air atmosphere, the calcination temperature is 400 ℃, the calcination time is 10 minutes, and the calcination process is : First, the temperature was raised to 100°C at a heating rate of 5°C / min, and kept for 10 minutes; the temperature was raised from 100°C to 150°C at a heating rate of 2°C / min, and ke...

Embodiment 3

[0040] 310 g silver nitrate AgNO 3 Prepared into a solution and reacted with an appropriate amount of sodium bicarbonate to prepare Ag 2 CO 3 Raw materials, after fully reacting, carry out suction filtration and washing to obtain Ag 2 CO 3 The raw material is dissolved in 750ml of ammonia solution with a concentration of 5wt.%, spray-dried in an air atmosphere, the flow rate of the solution is 800 ml / hour, the flow rate of the carrier gas is 0.29MPa, the air inlet temperature is controlled at 280°C, and the air outlet temperature is controlled The precursor powder of the quasi-spherical porous silver powder is made at 180°C; the precursor powder of the quasi-spherical porous silver powder is placed in an alumina crucible, and calcined under a nitrogen atmosphere, the calcining temperature is 600°C, and the calcining time is 20 minutes. The process is as follows: first, the temperature is raised to 100°C at a heating rate of 5°C / min, and the temperature is kept for 30 minute...

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Abstract

The invention discloses a near-spherical porous silver powder industrialized preparation method, which comprises the following steps: (1) the material of silver carbonate is dissolved in the ammonia solution, mixed evenly and prepared into 5 to 25wt% silver ammonium solution, (2) the prepared silver ammonium solution is introduced into a spray drying device for spray drying, and the precursor powder of the near-spherical porous silver powder is acquired, and (3) the calcination of the precursor powder is conducted, and the near-spherical porous silver powder is acquired as the temperature is reduced to ambient temperature. The near-spherical porous silver powder industrialized preparation method has the advantages of simple process, easy control, low investment cost, thus being suitable for industrialized scale production and the preparation of catalyst material, electronic ceramics material, static-free material, low temperature superconducting material, electronic sizing agent, biosensor material, and inorganic antibacterial agent or deodorization and partial ultraviolet absorption functional materials; the prepared near-spherical porous silver powder has the advantages of a great amount of pore channels with dimension above micrometer connected with each other, high specific surface area and activity, high degree of crystallinity, and high yield.

Description

technical field [0001] The invention relates to a porous metal material, in particular to an industrial preparation method of a quasi-spherical porous silver powder. Background technique [0002] Due to its excellent physical and chemical properties, silver powder is widely used in the fields of catalyst materials, electronic ceramic materials, antistatic materials, low-temperature superconducting materials, electronic pastes, biosensor materials, inorganic antibacterial agents, deodorants, and functional materials that absorb part of ultraviolet rays. It has broad application prospects. [0003] At present, there have been many reports on the research results of silver powder at home and abroad. The main preparation methods include physical vapor phase evaporation condensation method, electron beam evaporation, sputtering method, X-ray ray induction, thermal plasma, sol-gel, microwave plasma method. , mechanical grinding method, laser high-temperature combustion method, ch...

Claims

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Application Information

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IPC IPC(8): B22F9/08
Inventor 章桥新史晓亮王盛杨华段兴龙
Owner WUHAN UNIV OF TECH
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