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Ag catalyst for producing epoxyethane, its preparation method and uses

A technology of silver catalyst and ethylene oxide, applied in the direction of catalyst activation/preparation, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve problems such as unsatisfactory effects

Active Publication Date: 2006-07-19
BEIJING YANHUA PETRO CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Although the above-mentioned patent documents have used alkaline earth metal additives and Ce, the effect obtained is still unsatisfactory, so this area still needs a silver catalyst and its preparation method that is fully improved on activity and selectivity

Method used

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  • Ag catalyst for producing epoxyethane, its preparation method and uses

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0045] The present invention will be further described below in conjunction with examples, but the scope of the present invention is not limited to these examples.

[0046] Carrier 1 and 2:

[0047] 30~500 mesh trihydrate α-Al 2 o 3 312g, 30-200 mesh fake Al monohydrate 2 o 3 104g, petroleum coke 81g, NH 4 F 7g, Mg(NO 3 ) 2 8.5g and BaSO 4 0g and 1.2g were respectively put into a mixer and mixed evenly, transferred to a kneader, added 0.18 liters of dilute nitric acid (nitric acid: water=1:3, weight ratio), and kneaded into a paste that could be extruded. Extruded into a ring with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 2.0mm, and dried at 80-120°C for more than 2 hours to reduce the free water content to below 10%.

[0048] Put the above two rings into a bell kiln, raise the temperature from room temperature to 1350°C to 1550°C after about 30 hours, and keep the temperature for 2 hours to obtain white α-Al 2 o 3 Carrier Sample 1 and C...

Embodiment 1-9

[0060] The same procedure as Comparative Examples 1-3 was repeated except that the impregnation solution additionally contained cerium sulfate in the amount shown in Table 2 below.

[0061] Example number

carrier number

The amount of cerium sulfate added (g)

Example 1

1

0.09

Example 2

1

0.17

Example 3

1

0.35

Example 4

2

0.09

Example 5

2

0.17

Example 6

2

0.35

Example 7

3

0.09

Example 8

3

0.17

Example 9

3

0.35

[0062] The silver and promoter content of the prepared catalyst were analyzed, and the results are listed in Table 3 below, wherein the content is calculated as metal.

[0063] The activity and selectivity of the catalyst samples were measured under the aforementioned process conditions using a microreactor evaluation device, and the test results are listed in Table 3 below.

[0...

Embodiment 10-12

[0069] The same procedure as Comparative Example 4 was repeated except that the impregnating solution additionally contained cerium acetate or cerium oxalate in the amount shown in Table 4 below.

[0070] Example number

Types of cerium additives

Amount added (g)

Example 10

Cerium acetate

0.19

Example 11

Cerium acetate

0.38

Example 12

Cerium oxalate

0.15

[0071] The silver and additive content of the prepared catalyst were analyzed, and the results are listed in Table 5 below, wherein the content is calculated as metal.

[0072] The activity and selectivity of the catalyst samples were measured under the aforementioned process conditions using a microreactor evaluation device, and the test results are listed in Table 5 below.

[0073]

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PUM

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Abstract

The invention discloses a silver catalyst making method and appliance of epoxyethane, which comprises the following steps: soaking the compound with silver, organic amine, alkali metal adjuvant, cerium adjuvant, random alkali earth metal adjuvant, rhenium adjuvant and theses adjuvant solutions to sinter into porous alpha-alumina carrier; filtering; drying; activating through compound gas with oxygen to produce silver catalyst. The method possesses higher flexibility and selectivity.

Description

technical field [0001] The present invention relates to a kind of silver catalyst and preparation method thereof, more specifically the present invention relates to a kind of silver catalyst and preparation method thereof for producing ethylene oxide by ethylene oxidation, also relate to this catalyst in ethylene oxidation production epoxy use in ethane. 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...

Claims

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Application Information

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IPC IPC(8): B01J23/66B01J37/02C07D301/10
CPCY02P20/52
Inventor 张志祥陈建设高政李金兵金积铨王淑娟李淑勋
Owner BEIJING YANHUA PETRO CHEM
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