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Ag catalyst/carrier material with controllable specific surface area, and preparation method thereof

A technology of carrier material and specific surface area, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problems of low stability and catalytic activity of silver catalyst, large specific surface area and high specific strength, Achieve the effect of high specific strength, large specific surface area and low relative density

Pending Publication Date: 2020-11-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention aims at the problems of low stability and catalytic activity of silver catalysts in the prior art, and provides an Ag catalyst / carrier material with controllable specific surface area and its preparation method. Mg-xAg, Cu-xAg, Zn-xAg or Al-xAg alloy microporous material, and then dealloyed to obtain a micropore and nanopore composite Ag catalyst / support material; the Ag catalyst / support material has a relative density Low, high specific strength, large specific surface area, high activity, and controllable pore structure size

Method used

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  • Ag catalyst/carrier material with controllable specific surface area, and preparation method thereof
  • Ag catalyst/carrier material with controllable specific surface area, and preparation method thereof
  • Ag catalyst/carrier material with controllable specific surface area, and preparation method thereof

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Embodiment 1

[0026] Embodiment 1: a kind of Ag catalyst / carrier material preparation method with controllable specific surface area, concrete steps are as follows:

[0027] (1) High-purity magnesium and high-purity silver are vacuum mixed and overheated to obtain metal mixed melt; wherein the purity of high-purity magnesium is >99.99%, the purity of high-purity silver is >99.99%, and the mass fraction of silver in the metal mixed melt is 20%. Vacuum mixed and overheated smelted Vacuum is 10 -1 Pa, the temperature T of vacuum mixed superheated smelting is 1023K, that is, the temperature T of vacuum mixed superheated smelted is 150K above the liquidus line of the metal mixed melt;

[0028] (2) Pass hydrogen into the metal mixed melt to a preset pressure (0.2MPa) and smelt at a constant temperature of 1023K for 30 minutes to obtain a solid-gas mixed melt;

[0029] (3) solid-gas eutectic directional solidification of solid-gas mixed melt to obtain Mg-20Ag alloy microporous material; wherein t...

Embodiment 2

[0032] Embodiment 2: a kind of Ag catalyst / carrier material preparation method with controllable specific surface area, concrete steps are as follows:

[0033] (1) High-purity magnesium and high-purity silver are vacuum mixed and overheated to obtain a metal mixed melt; wherein the purity of high-purity magnesium is >99.99%, the purity of high-purity silver is >99.99%, and the mass fraction of silver in the metal mixed melt is 48.61%. Vacuum is 10 -1 Pa, the temperature T of vacuum mixed superheated smelting is 995K, that is, the temperature T of vacuum mixed superheated smelted is 250K above the liquidus line of the metal mixed melt;

[0034] (2) Pass hydrogen into the metal mixed melt to the preset pressure (0.6MPa) and smelt at a constant temperature of 995K for 30 minutes to obtain a solid-gas mixed melt;

[0035] (3) solid-gas eutectic directional solidification of solid-gas mixed melt to obtain Mg-48.61Ag alloy microporous material; wherein the rate of solid-gas eutecti...

Embodiment 3

[0038] Embodiment 3: a kind of Ag catalyst / carrier material preparation method with controllable specific surface area, concrete steps are as follows:

[0039] (1) High-purity magnesium and high-purity silver are vacuum mixed and overheated to obtain a mixed metal melt; wherein the purity of high-purity magnesium is >99.99%, the purity of high-purity silver is >99.99%, and the mass fraction of silver in the metal mixed melt is 80%. Vacuum mixed and overheated smelted Vacuum is 10 -1 Pa, the temperature T of vacuum mixed superheated smelting is 1283K, that is, the temperature T of vacuum mixed superheated smelted is 200K above the liquidus line of the metal mixed melt;

[0040] (2) Pass hydrogen into the metal mixed melt to the preset pressure (0.6MPa) and smelt at a constant temperature of 1283K for 30 minutes to obtain a solid-gas mixed melt;

[0041] (3) solid-gas eutectic directional solidification of solid-gas mixed melt to obtain Mg-80Ag alloy microporous material; where...

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Abstract

The invention relates to an Ag catalyst / carrier material with a controllable specific surface area, and a preparation method thereof, and belongs to the technical field of catalyst materials. According to the preparation method, a Mg-xAg, Cu-xAg, Zn-xAg or Al-xAg alloy microporous material with a controllable pore structure is prepared by adopting a solid-gas eutectic directional solidification method, and then dealloying treatment is carried out to obtain an Ag catalyst / carrier material compounded by micro-pores and nano-pores, wherein the Ag catalyst / carrier material has the characteristicsof low relative density, high specific strength, large specific surface area, high activity and controllable pore structure size; and the technical problems of poor catalyst carrier stability and lowcatalyst activity are solved, and the technical problems of poor pore structure regularity and difficult regulation and control of porosity, pore size and the like of a porous catalytic material due to random pore growth direction are also solved.

Description

technical field [0001] The invention relates to an Ag catalyst / carrier material with controllable specific surface area and a preparation method thereof, belonging to the technical field of catalyst materials. Background technique [0002] In industry, silver catalysts are widely used in the reaction of ethylene epoxidation to ethylene oxide, and the deep oxidation of carbon dioxide and water occurs at the same time. The catalyst usually uses alumina as the carrier, silver as the active component, and contains certain auxiliary In order to improve its catalytic performance, its activity and stability are the main performance indicators in practical applications. In the process of ethylene oxide production of ethylene oxide, the performance of silver catalysts has a great influence on economic benefits. Improving the activity and stability of silver catalysts is the main direction of silver catalyst research. [0003] The performance of the silver catalyst not only has an im...

Claims

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Application Information

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IPC IPC(8): B01J23/50B01J35/10B01J37/08C07D303/04C07D301/03
CPCB01J23/50B01J37/0018B01J37/08C07D303/04C07D301/03B01J35/61B01J35/60B01J35/653B01J35/657B01J35/651
Inventor 王彬李再久金青林刘恩典刘明诏
Owner KUNMING UNIV OF SCI & TECH