Alkali treatment modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier

An alumina carrier and silver catalyst technology, applied in metal/metal oxide/metal hydroxide catalysts, physical/chemical process catalysts, catalyst carriers, etc., can solve the problem of high equipment requirements, little improvement in selectivity, The production cost is high, and the preparation method has the advantages of simple steps, good selectivity, and easy to obtain.

Active Publication Date: 2013-10-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process requires high equipment and high production costs, which is not conducive to implementation.
[0011] Chinese patent CN1467022A discloses a method for preparing an ethylene oxide silver catalyst carrier. This method solves the problem that the activity of the silver catalyst prepared by the previous technology is not high enough by treating the α-alumina carrier with an alkaline substance.
[0013] Above-mentioned invention all mainly improves the activity, stability of silver catalyst, but little to the raising effect of selectivity

Method used

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  • Alkali treatment modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier
  • Alkali treatment modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier
  • Alkali treatment modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] Example 1 Preparation of α-Al 2 O 3 The carrier is used as a comparative example for Examples 2 to 7; Examples 2 to 7 are respectively under different reaction conditions to the α-Al prepared in Example 1. 2 O 3 The carrier is treated with alkali to obtain modified α-Al 2 O 3 Carrier; Example 8 adopts the α-Al prepared in Example 1 2 O 3 The carrier was used to prepare a silver catalyst, which was used as a comparative example for Examples 9 to 14; Examples 9 to 14 respectively adopted the modified α-Al prepared in Examples 2 to 7. 2 O 3 Support for the preparation of silver catalysts. Determination of catalyst performance

[0063] The various silver catalysts involved in the present invention are tested for their initial activity and selectivity with a laboratory microreactor (hereinafter referred to as "microreactor") evaluation device. The reactor used in the micro-reaction evaluation device is a stainless steel tube with an inner diameter of 4 mm, and the r...

Embodiment

[0072] Example 1: Preparation of α-Al 2 O 3 carrier

[0073] 200-500 mesh trihydrate α-Al 2 O 3 403g, 200~400 mesh fake monohydrate Al 2 O 3 81g, NH 4 F3g and BaSO 4 0.5g was put into a mixer and mixed, then transferred to a kneader, added with 90ml of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and kneaded into an extrudable paste. It is extruded into a five-hole column with an outer diameter of 8.0 mm, a length of 6.0 mm and an inner diameter of 1.0 mm, and is dried at 80-120 ° C for 10 hours to reduce the free water content to less than 10 wt%, and the molded α-alumina carrier is prepared. blank. Then the green body was put into an electric furnace, raised from room temperature to 1400°C for 30 hours, and kept at a constant temperature for 2 hours. 2 O 3 The carrier is named Z-1, and its crushing strength and water absorption rate are measured, the results are shown in Table 1, and the scanning electron microscope photo of the carrier is shown in ...

Embodiment 2

[0074] Example 2: Preparation of modified α-Al 2 O 3 carrier

[0075] Prepare 20g 0.2mol / l Ba(OH) according to the solid-liquid mass ratio of 1:1 2 solution, and Ba(OH) 2 The temperature of the solution was kept constant to 20°C, and 20g of Z-1 carrier was weighed and put into Ba(OH) 2 After stirring for 0.2 h, the carrier was taken out and washed with deionized water until the pH value of the filtrate was about 7. Then put the carrier into an oven to dry at 100°C for 10 hours, and name the obtained modified α-alumina carrier as Z-2, and measure its crushing strength and water absorption. The results are shown in Table 1.

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Abstract

The invention relates to an alkali treatment modification method for forming an alpha-alumina carrier of a silver catalyst used for producing ethylene oxide through ethylene oxidation. The method has the beneficial effect of increasing the pore canal of the carrier by treating the formed alpha-alumina carrier with an alkaline solution at a certain concentration under the heating and stirring conditions. The silver catalyst prepared from and supported by the alpha-alumina carrier prepared by the method is beneficial to diffusion of reaction products. The modified alpha-alumina carrier shows good selectivity when applied to the reaction process of producing ethylene oxide through ethylene oxidation.

Description

technical field [0001] The invention relates to the technical field of catalysts and catalyst carriers, in particular, to the modification of an α-alumina carrier by alkali treatment, the preparation and application of a silver catalyst supported by it, and more specifically, to a method using an alkaline solution A modification method for treating an α-alumina carrier, a preparation method of a silver catalyst supported by the modified α-alumina carrier and its application in producing ethylene oxide by oxidizing ethylene. Background technique [0002] Under the action of silver catalyst, the oxidation of ethylene mainly produces ethylene oxide (EO), and at the same time, side reactions produce carbon dioxide and water, among which activity, selectivity and stability are the main performance indicators of silver catalyst. The so-called activity refers to the reaction temperature required when the ethylene oxide production process reaches a certain reaction load. The lower t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J35/10B01J23/66C07D301/03C07D303/04
CPCY02P20/52
Inventor 李贤丰林强李雪莲任冬梅孙欣欣曹淑媛高立新李金兵陈建设张志祥
Owner CHINA PETROLEUM & CHEM CORP
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