High-activity silver powder and preparation method and application thereof

A high-activity, silver powder technology, applied in chemical instruments and methods, transportation and packaging, metal processing equipment, etc., can solve the problems of silver powder collapse, difficult precipitation and separation, organic residues, etc., to improve catalytic activity and efficiency, and improve catalytic efficiency , the effect of large specific surface area

Active Publication Date: 2020-02-28
广东羚光新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using α-Al 2 o 3 The preparation of silver catalysts on the carrier is not conducive to the recovery of precious metals, and the catalytic efficiency needs to be improved
Although the catalytic efficiency of nano-sized silver powder is greatly improved, it is difficult to precipitate and separate, and it is easy to form impurities and remain in the reaction material
Hollow silver powder has good catalytic efficiency and is easy to separate. Most of the existing methods for preparing hollow silver powder use macroporous resin as a carrier, but high-temperature thermal decomposition is required. Incomplete decomposition may lead to organic residues, and high-resolution thermal sintering may cause silver powder to collapse.

Method used

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  • High-activity silver powder and preparation method and application thereof
  • High-activity silver powder and preparation method and application thereof
  • High-activity silver powder and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A high activity silver powder, prepared by the following method:

[0041] (1) Weigh 10g of silver nitrate into the reaction kettle and add water to dissolve, add the polyamide-amine polymer solution containing 6.5g dissolved in advance, and then prepare a 50L low-concentration silver nitrate solution system, start stirring to 110r / min Stir evenly at high speed, and maintain the system temperature at 35°C.

[0042](2) Weigh 0.57kg of ascorbic acid into the batching tank and add water to dissolve, add 120g of sodium hydroxide and add water to dissolve to prepare a 2.5L reduction solution system, maintain the system temperature at 45°C, and quickly add the solution to the reaction kettle at one time, The stirring speed was adjusted to 25r / min, and the stirring was maintained at a low speed for 30 minutes, so that the silver grains in the reaction kettle could be attached to the polyamide-amine polymer to form silver grains.

[0043] (3) After the reaction is completed, ad...

Embodiment 2

[0047] A high activity silver powder, prepared by the following method:

[0048] (1) Weigh 10g of silver nitrate into the reaction kettle and add water to dissolve it, add the polyamide-amine polymer solution containing 2.5g dissolved in advance, then prepare a 70L low-concentration silver nitrate solution system, start stirring to 150r / min Stir evenly at high speed and maintain the system temperature at 45°C.

[0049] (2) Weigh 0.57kg of ascorbic acid to the batching tank and add water to dissolve, add 160g of sodium hydroxide and add water to dissolve to prepare a 2.5L reducing solution system, maintain the system temperature at 45°C, and quickly add the solution to the reaction kettle at one time, The stirring speed was adjusted to 15 r / min, and the stirring was maintained at a low speed for 60 minutes, so that the silver grains in the reaction kettle could be attached to the polyamide-amine polymer to form silver grains.

[0050] (3) After the reaction is completed, add 2...

Embodiment 3

[0054] A high activity silver powder, prepared by the following method:

[0055] (1) Weigh 20g of silver nitrate into the reaction kettle and add water to dissolve, add the polyamide-amine polymer solution containing 2.5g dissolved in advance, and then prepare a 70L low-concentration silver nitrate solution system, start stirring to 180r / min Stir evenly at high speed and maintain the system temperature at 55°C.

[0056] (2) Weigh 0.57kg of ascorbic acid to the batching tank and add water to dissolve, add 60g of sodium carbonate and add water to dissolve to prepare a 2.5L reduction solution system, maintain the system temperature at 45°C, and quickly add the solution to the reaction kettle at one time, and stir Adjust the speed to 40r / min, and keep stirring at a low speed for 60 minutes, so that the silver grains in the reaction kettle can be attached to the organic polymer to form silver grains.

[0057] (3) After the reaction is completed, add 25 g of sodium alkylbenzene sul...

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Abstract

The invention provides high-activity silver powder and a preparation method and application thereof, and relates to the field of metal powder metallurgy. The preparation method includes the followingsteps that S1, a silver nitrate solution and an architecture agent are prepared, mixed, diluted and prepared into a silver nitrate solution system with the concentration of 0.1-1.0 g / L; S2, a reducingagent is dissolved, a pH regulator is added to obtain a reduction solution, and the reduction solution and the silver nitrate solution system obtained in the step S1 are mixed and slowly stirred to react and generate silver crystals; S3, a disperse inducer is added into the system obtained in the step S2 and evenly mixed; S4, a silver nitrate solution with the concentration of 50-250 g / L is prepared and added into the system obtained in the step S3 at a predetermined time, and after addition is completed, standing and ageing are conducted; and S5, the material obtained in the step S4 is cleaned and deposited, and the high-activity silver powder is obtained. The silver powder obtained through the method is of a hollowed-out structure and is large in specific surface area, high in catalyticefficiency and easy to settle and separate.

Description

technical field [0001] The invention relates to the fields of metal powder metallurgy and powder material preparation, in particular to a high-activity silver powder and its preparation method and application. Background technique [0002] Metal catalysts are solid catalysts with metal as the main active component, among which silver catalysts are an important branch, with a global consumption of up to 300-500 tons per year. Silver catalysts show good activity for oxidation reaction. According to morphology, silver catalysts include metal type and support type. Metallic silver catalysts can be used for the oxidation of methanol to formaldehyde and the oxidative dehydrogenation of ethanol to acetaldehyde. Supported silver catalysts are mainly used in the oxidation of ethylene oxide to ethylene oxide. The catalyst generally uses α-Al 2 o 3 As a carrier, the silver content is 10%-30%. In order to improve the performance of the catalyst, co-catalysts such as rubidium, cesium,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/24B22F1/00B01J23/50B01J35/02B01J35/08B01J35/10
CPCB22F9/24B01J23/50B01J35/08B01J35/026B01J35/023B01J35/1014B22F2009/245B22F1/0655B22F1/054B22F1/07
Inventor 梁炳联娄红涛冯辉邱衍嵩万广宇唐国辉梁俊展张旭玲黄雨佳舒斌
Owner 广东羚光新材料股份有限公司
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