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A kind of highly active silver powder and its preparation method and application

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: 2022-05-27
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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  • A kind of highly active silver powder and its preparation method and application
  • A kind of highly active silver powder and its preparation method and application
  • A kind of highly active silver powder and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] A kind of high-activity silver powder is prepared by the following method:

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

[0042](2) take by weighing 0.57kg of ascorbic acid to the batching bucket and dissolve in water, add 120g of sodium hydroxide and dissolve in water to prepare a 2.5L reducing solution system, maintain the system temperature to be 45 ℃, and this solution is quickly added to the reactor 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 crystal grains in the reaction kettle could be attached to the polyamide-amine polymer to generate silver crystal grains.

[0043] (3) After the reaction is complet...

Embodiment 2

[0047] A kind of high-activity silver powder is prepared by the following method:

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

[0049] (2) take by weighing 0.57kg ascorbic acid to the batching bucket and dissolve in water, add 160g sodium hydroxide and dissolve in water to prepare a 2.5L reducing solution system, maintain the system temperature to be 45 ℃, and this solution is quickly added to the reactor 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 crystal grains in the reaction kettle could be attached to the polyamide-amine polymer to generate silver crystal grains.

[0050] (3) After the reaction...

Embodiment 3

[0054] A kind of high-activity silver powder is prepared by the following method:

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

[0056] (2) take by weighing 0.57kg of ascorbic acid to the batching bucket and dissolve in water, add 60g of sodium carbonate and dissolve in water to prepare a 2.5L reducing solution system, maintain the system temperature at 45 ° C, and quickly add this solution to the reactor at one time, stirring The speed was adjusted to 40 r / min, and the stirring was maintained at low speed for 60 minutes, so that the silver crystal grains in the reaction kettle could be attached to the organic polymer to generate silver crystal grains.

[0057] (3) After the completion of the reactio...

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Abstract

The invention provides a high-activity silver powder, a preparation method and application thereof, and relates to the field of metal powder metallurgy. The preparation method of the present invention comprises the following steps: S1, preparing silver nitrate solution and framework agent solution, mixing silver nitrate solution and framework agent solution, diluting, and preparing a silver nitrate solution system whose concentration is 0.1-1.0g / L; S2 1. Dissolving the reducing agent, adding a pH regulator to obtain a reducing solution, mixing the reducing solution with the silver nitrate solution system obtained in step S1, stirring at a slow speed, and reacting to generate silver grains; S3, adding the dispersion inducer to the obtained silver nitrate in step S2 In the system, mix evenly; S4, prepare the silver nitrate solution with a concentration of 50-250g / L, add it to the system obtained in step 3 within a predetermined time, after the addition is completed, let the material stand still, and age; S5, cleaning step S4 The material obtained in the process is settled to obtain highly active silver powder. The silver powder obtained by the method of the invention has hollow structure, large specific surface area, high catalytic efficiency and easy sedimentation and separation.

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 a preparation method and application thereof. Background technique [0002] Metal catalysts are solid catalysts with metal as the main active component, of which silver catalysts are an important branch, and the annual global consumption is as high as 300-500 tons. Silver catalysts show good activity for oxidation reactions. From the perspective of morphology, silver catalysts include metal type and carrier-supported type. Metallic silver catalysts can be used for methanol oxidation to formaldehyde and ethanol oxidative dehydrogenation to acetaldehyde. The supported silver catalyst is mainly used in the oxidation of ethylene 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, rubidium, cesium, calcium, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F9/24B22F1/0655B01J23/50B01J35/02B01J35/08B01J35/10B01J35/00
CPCB22F9/24B01J23/50B22F2009/245B22F1/0655B22F1/054B22F1/07B01J35/50B01J35/51B01J35/40B01J35/613
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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