Modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier

A technology of alumina carrier and silver catalyst, which is applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc., which can solve the problem of little improvement in selectivity and insufficient activity of silver catalyst High, high production costs and other issues, to achieve the effect of easy access, good initial selectivity, and simple steps

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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  • Modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier
  • Modification method of alumina carrier as well as preparation method and application of silver catalyst supported by alumina carrier
  • 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

[0064] Example 1 Preparation of α-Al 2 o 3 Carrier, and as the comparative example of embodiment 2~8; Embodiment 2~8 is respectively under different reaction conditions to the α-Al that embodiment 1 makes 2 o 3 The carrier is subjected to combined acid-base treatment to obtain modified α-Al 2 o 3 carrier.

Embodiment 9

[0065] Embodiment 9 adopts the α-Al that embodiment 1 makes 2 o 3 Carrier prepares silver catalyst, and as the comparative example of embodiment 10~16; Embodiment 10~16 adopts the modified α-Al that embodiment 2~8 makes respectively 2 o 3 carrier for preparing silver catalysts.

[0066] Determination of Catalyst Performance

[0067] Various silver catalysts involved in the present invention were tested for their initial activity and selectivity with a laboratory microreactor (hereinafter referred to as "microreactor") evaluation device. The reactor used in the micro-reflection evaluation device is a stainless steel tube with an inner diameter of 4 mm, and the reactor is placed in a heating jacket. The packing volume of the catalyst is 1ml, and there is an inert filler at the lower part, so that the catalyst bed is located in the constant temperature zone of the heating mantle.

[0068] The catalyst activity used in the present invention and the measuring condition of sele...

Embodiment

[0075] Example 1: Preparation of α-Al 2 o 3 carrier

[0076] 200~500 mesh trihydrate α-Al 2 o 3 403g, 200-400 mesh false monohydrate Al 2 o 3 81g, NH 4 F3g and BaSO 4 0.5 g was put into a mixer and mixed, then transferred to a kneader, added dilute nitric acid (nitric acid: water=1:3, weight ratio) 90 ml, and kneaded into a paste that could be extruded. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for 10 hours to reduce the free water content below 10wt% to obtain a shaped α-alumina carrier raw material. Blank. Then put the green body into an electric furnace, raise it from room temperature to 1400°C over 30 hours, and keep the temperature constant for 2 hours, and the prepared white α-Al 2 o 3 The carrier is named Z-1, and its crushing strength, water absorption and specific surface area are measured. The results are shown in Table 1. The scanning electron microscope photo ...

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Abstract

The invention relates to a 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 and specific surface area of the carrier by carrying out acid-alkali combined treatment on the formed alpha-alumina carrier. The silver catalyst prepared from and supported by the alpha-alumina carrier prepared by the method is beneficial to increase of reaction centers and diffusion of 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 present invention relates to the technical field of catalysts and catalyst carriers, in particular, to a method for modifying an α-alumina carrier, and to the preparation and application of a supported silver catalyst, and more specifically, to a method for the modification of α-alumina carriers. A method for modifying an alumina carrier for combined acid-base treatment, a silver catalyst made from the modified carrier and its application in the production of ethylene oxide by ethylene oxidation. 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 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 the rea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J21/04B01J23/66C07D303/04C07D301/10
CPCY02P20/52
Inventor 李贤丰李金兵王辉孙欣欣任冬梅代武军薛茜李淑云陈建设张志祥
Owner CHINA PETROLEUM & CHEM CORP
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