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Supported silver catalyst and its preparation method and application

A supported silver and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, physical/chemical process catalysts, etc., to achieve the effects of uniform size of silver particles, not easy to agglomerate, and high catalytic performance

Active Publication Date: 2022-03-29
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned patent documents use different methods to prepare silver catalysts for ethylene epoxidation, which bring different degrees of improvement in various aspects, there is still room for improvement in controlling the morphology and distribution of silver particles.

Method used

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  • Supported silver catalyst and its preparation method and application
  • Supported silver catalyst and its preparation method and application
  • Supported silver catalyst and its preparation method and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Add 100g of ethylenediamine and 30g of 1,4-butylenediamine into 200g of deionized water, mix well, and keep the water bath at room temperature, then slowly add 110g of silver oxalate into it, wait until the silver oxalate is completely dissolved, then add 0.5g of cesium nitrate, 0.4g of calcium acetate and 0.3g of ammonium perrhenate were fully stirred until completely dissolved to obtain a mixed solution.

[0047] Add 3 g of polyvinylpyrrolidone (molecular weight: 58,000) into the above mixed solution and keep stirring until completely dissolved.

[0048] Put 30 g of the selected porous α-alumina carrier into a container that can be vacuumed, and the pressure is reduced to below 10 mmHg. Add the above impregnation solution until the liquid surface is completely immersed in the solid, keep for 30 minutes, and remove the excess solution by leaching. The impregnated carrier was dried in the air at 60°C for 10 minutes, then heated in the air stream at 400°C for 3 minutes t...

Embodiment 2

[0050] The preparation of the catalyst was the same as in Example 1, except that the amount of polyvinylpyrrolidone in step II was reduced to 0.3 g. In the prepared silver catalyst, the average particle diameter of the silver particles is 105nm, and the silver particles with a particle diameter within the range of ±50% of the average particle diameter account for more than 73% of all silver particles, and the particle diameter is within the range of the average particle diameter ±20%. The silver particles account for more than 60% of all silver particles.

Embodiment 3

[0052] The preparation of the catalyst was the same as in Example 1, except that in step II, 5 ml of a 40 g / L polyacrylamide (molecular weight: 5 million) solution was added to the mixed solution instead of polyvinylpyrrolidone solid. In the prepared silver catalyst, the average particle diameter of the silver particles is 206nm, and the silver particles with a particle diameter within the range of the average particle diameter ± 50% account for more than 74% of all silver particles, and the particle diameter is within the range of the average particle diameter ± 20%. The silver particles account for more than 52% of all silver particles.

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Abstract

The invention belongs to the technical field of catalyst preparation, and relates to a supported silver catalyst and its preparation method and application. The supported silver catalyst comprises an alumina carrier and silver particles loaded thereon, the average particle diameter of the silver particles is 100-400nm, and the silver particles with a particle diameter within the range of the average particle diameter ± 50% account for 70% of the total silver particles. % or more, and the silver particles whose particle diameter is within the range of the average particle diameter ±20% account for more than 50% of all silver particles. By introducing an appropriate amount of specific polymers in the preparation, the agglomeration between silver particles can be reduced, and the uniform distribution of silver particles on the carrier can be controlled. The nanoparticle size of the silver active component in the prepared silver catalyst is uniform and adjustable, and the distance between silver particles is obvious. , the performance of the catalyst is higher.

Description

technical field [0001] The invention belongs to the technical field of catalyst preparation, and more specifically relates to a supported silver catalyst, a preparation method of the supported silver catalyst, and an application of the supported silver catalyst. Background technique [0002] As a chemical product, ethylene oxide is a bulk petrochemical product whose demand is second only to polyethylene among ethylene derivatives. It has become an indispensable organic chemical raw material in the development of a series of related industries in the petrochemical field. In the industrial epoxidation of ethylene to produce ethylene oxide, the mixed gas containing ethylene and oxygen produces ethylene oxide under certain reaction conditions under the action of a silver catalyst. [0003] At present, in the field of industrial ethylene epoxidation, silver catalyst is still the only effective catalyst widely used in actual production. The catalyst usually uses alumina as the car...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/50B01J21/04B01J35/10B01J37/02C07D303/04C07D301/10
CPCB01J23/50B01J21/04B01J37/0201B01J37/0213B01J37/0209C07D303/04C07D301/10B01J35/612Y02P20/52
Inventor 李旻旭林伟梁汝军李金兵代武军蒋军崔秉全高立新
Owner CHINA PETROLEUM & CHEM CORP