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Preparation method for composite silver catalyst, and composite silver catalyst and application thereof

A silver catalyst and composite technology, applied in the direction of chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing the selectivity decline rate of catalysts, and achieve high selective effect

Active Publication Date: 2017-01-11
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The alumina carrier used in US4740493, US4829043 and EP0501317 patents contains a certain amount of Ca, Al, K, and Na soluble salts, claiming to reduce the decline rate of catalyst selectivity during use

Method used

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  • Preparation method for composite silver catalyst, and composite silver catalyst and application thereof
  • Preparation method for composite silver catalyst, and composite silver catalyst and application thereof
  • Preparation method for composite silver catalyst, and composite silver catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] First Dip:

[0032] Add 2.68 g of ethylenediamine, 0.9 g of ethanolamine and 36.21 g of deionized water to a stirred container to obtain a mixed solution. Slowly add 6.21g of silver oxalate into the mixture under constant stirring, keeping the temperature below 30°C to dissolve all the silver oxalate. Then add 4.0ml of potassium dichromate aqueous solution (concentration is 0.0025g / ml, based on the atomic weight of chromium), mix well to make 50g of the first impregnating solution for use. Based on the total mass of the first impregnating solution, the concentration of silver was 8 wt % (by atomic weight of silver), and the concentration of chromium was 200 ppm by weight (by atomic weight of chromium).

[0033] Take 15g of α-Al 2 o 3 For the carrier, put it into a container that can be vacuumed, and add the above first impregnating solution, and then completely immerse the carrier. Vacuum to above 10mmHg for about 15 minutes, then filter to remove excess solution. ...

Embodiment 2

[0038] Composite silver catalyst is prepared in the same way as in Example 1, except that the amount of silver oxalate added in the first impregnation is adjusted to 3.11g, so that based on the total mass of the first impregnation solution, silver in the first impregnation solution The concentration of chromium is 4wt% (calculated by atomic weight of silver), and the concentration of chromium is 200 ppm by weight (calculated by atomic weight of chromium), that is, the silver catalyst 2 is made.

Embodiment 3

[0040] The method identical with embodiment 1 prepares composite silver catalyst, and difference only is that the volume of the potassium dichromate that adds in impregnating for the first time is adjusted to 6.0ml (concentration of potassium dichromate is constant), so that based on the first The total mass of the impregnating solution, the concentration of silver in the first impregnating solution is 8wt% (by silver atomic weight), and the concentration of chromium is 300 wtppm (by chromium atomic weight) to make the silver catalyst 3.

[0041] Analyzing the catalysts 1-3 of the present invention, it is found that the content of silver in the composite silver catalyst of the present invention is all in the range of 2-50wt% based on the total weight of the composite silver catalyst. And, in the composite silver catalyst of the present invention, all contain two kinds of silver grains that respectively contain different additives, the first silver grains include chromium based ...

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Abstract

The invention relates to a preparation method for a composite silver catalyst used for producing ethylene oxide through ethylene oxidation. The preparation method comprises the following steps: 1) dissolving a compound containing silver and a compound containing chromium in an amine-contained solution or ammonia water so as to prepare a silver-ammonia solution; 2) subjecting an alpha-Al2O3 carrier to soaking in the silver-ammonia solution prepared in the step 1), taking out the soaked alpha-Al2O3, then carrying out draining, and carrying out calcination treatment so as to prepare a semi-finished silver catalyst; 3) dissolving the compound containing silver, the compound containing rhenium and an optional compound containing cesium in the amine-contained solution or the ammonia water so as to prepare the silver-ammonia solution; and 4) subjecting the semi-finished silver catalyst prepared in the step 2) to soaking in the silver-ammonia solution obtained in the step 3), taking out the soaked semi-finished silver catalyst, then carrying out draining, and carrying out calcination treatment so as to prepare the composite silver catalyst. The invention also relates to the composite catalyst and application of the catalyst in production of ethylene oxide.

Description

technical field [0001] The invention relates to a preparation method of a catalyst, in particular to a preparation method of a catalyst used for producing ethylene oxide. The invention also relates to the composite catalyst and the application of the catalyst in the production of ethylene oxide. Background technique [0002] Under the action of silver catalyst, the oxidation of ethylene mainly produces ethylene oxide, and at the same time, side reactions produce carbon dioxide and water. Among them, activity, selectivity and stability are the main performance indicators of silver catalyst. The so-called activity refers to the reaction temperature required when the production process of ethylene oxide reaches a certain reaction load. The lower the reaction temperature, the higher the activity of the catalyst. The so-called selectivity refers to the ratio of the moles of ethylene converted into ethylene oxide in the reaction to the total reaction moles of ethylene. The so-c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/68C07D301/10C07D303/04
CPCY02P20/52
Inventor 林伟李金兵孙欣欣李贤丰曹淑媛蒋军高立新李旻旭
Owner CHINA PETROLEUM & CHEM CORP
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