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Porous silver catalyzer and process for preparing same

A technology of porous silver and catalyst, which is applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of simple process, convenient operation, and easy recovery and reuse.

Inactive Publication Date: 2010-04-14
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the selective removal of Au in Au-Ag alloy by "reverse alloying" method, and the method of preparing porous silver electrode has not been reported.

Method used

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  • Porous silver catalyzer and process for preparing same
  • Porous silver catalyzer and process for preparing same
  • Porous silver catalyzer and process for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Preparation of porous silver catalyst:

[0028] (1) Take Au with a thickness of 100 microns, a length of 4 cm, and a width of 2 cm 42 Ag 58 Alloy flakes are placed in an electrolytic cell.

[0029] (2) with Au 42 Ag 58 The alloy sheet is used as the working electrode, the platinum sheet is used as the auxiliary electrode, and saturated calomel is used as the reference electrode, and 20mL of alkaline thiourea solution with pH=12±1 is used as the electrolyte and placed in the electrolytic cell (thiourea in the electrolyte, over The concentrations of sodium sulfate and sodium silicate are respectively: 0.25mol / L, 0.1mol / L, 0.05mol / L), and the electrochemical workstation is applied with a voltage of 0.5V for corrosion. During this process, the Au in the alloy is continuously corroded and dissolved. At the same time, sulfur in thiourea reacts with elemental Ag to form Ag on the surface of the alloy. 2 S, will wrap some Au simple substance and hinder its corrosion and di...

Embodiment 2

[0037] Preparation of porous silver catalyst:

[0038] (1) Take Au with a thickness of 100 microns, a length of 4 cm, and a width of 2 cm 42 Ag 58 Alloy flakes are placed in an electrolytic cell.

[0039] (2) with Au 42 Ag 58 The alloy sheet is used as the working electrode, the platinum sheet is used as the auxiliary electrode, and saturated calomel is used as the reference electrode, and 20mL of alkaline thiourea solution with pH=12±1 is used as the electrolyte and placed in the electrolytic cell (thiourea in the electrolyte, over The concentrations of sodium sulfate and sodium silicate are respectively: 0.25mol / L, 0.1mol / L, 0.05mol / L), and the electrochemical workstation is applied with a voltage of 0.4V for corrosion. During this process, the Au in the alloy is continuously corroded and dissolved. At the same time, sulfur in thiourea reacts with elemental Ag to form Ag on the surface of the alloy. 2 S will wrap some Au simple substance and hinder its corrosion and dis...

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PUM

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Abstract

The invention discloses a porous silver catalyzer and process for preparing same, wherein the porous silver catalyzer has a dendritic porous structure, the sizes of bore diameters and pore walls range from 80 to 120 nanometers, the included silver atoms range from 88 to 93 percent, and the included gold atoms range from 7 to 12 percent. By adopting 'inverse dealloying' mode, the porous silver is prepared by using two steps as alloy material electrochemical corrosion and electrochemical reduction, the porous silver catalyzer and process for preparing same are simple in technology, convenient for operation and excellent in repeatability, moreover, the prepared catalyzer is non-supported, the bore diameters and the pore walls of the prepared porous silver are smaller, the specific surface areas are high, and the products can be easily recycled and reused.

Description

technical field [0001] The invention relates to a non-supported porous silver catalyst and its preparation, in particular to an unconventional preparation method of "reverse alloying", which belongs to the technical field of catalysts. Background technique [0002] Due to its excellent physical and chemical properties, silver has broad application prospects in the fields of catalyst materials, electronic ceramic materials, antistatic materials, and biosensor materials. Porous silver has been applied to the positive electrode manufacturing technology of Zn / AgO battery and Al / AgO battery. Its large surface area and internal bicontinuous pores greatly improve the mass transfer efficiency and the utilization rate of positive active materials. [0003] A common method for preparing porous metals is dealloying. Dealloying is the selective dissolution of a highly active metal element from a binary or multi-element alloy to form a porous sponge rich in another metal element. Commo...

Claims

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Application Information

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IPC IPC(8): B01J23/52B01J23/50B01J35/10B01J37/34
Inventor 刘召娜周兴峰邱翠翠马厚义
Owner SHANDONG UNIV