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Alumina carrier, preparation method thereof, silver catalyst and application

A technology of alumina carrier and silver catalyst, which is applied in the direction of physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, catalyst carrier, etc. It can solve the problems that it is difficult to ensure that the alumina carrier meets the requirements

Pending Publication Date: 2022-05-06
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the high shrinkage rate of the alumina support during preparation, it is usually necessary to calculate the shrinkage rate of alumina to predict the size of the support after calcination, so it is difficult to ensure that the prepared alumina support meets the requirements

Method used

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  • Alumina carrier, preparation method thereof, silver catalyst and application
  • Alumina carrier, preparation method thereof, silver catalyst and application
  • Alumina carrier, preparation method thereof, silver catalyst and application

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Experimental program
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preparation example Construction

[0028] According to the first aspect of the present invention, the present invention provides a kind of preparation method of alumina carrier, and this preparation method comprises the following steps:

[0029] 1) Prepare a mixture with the following composition:

[0030] a) 50-90% by weight of alpha-Al trihydrate based on the total weight of the mixture 2 o 3 ;

[0031] b) 5-50% by weight, based on the total weight of the mixture, of pseudomonohydrate A1 2 o 3 ;

[0032] c) 0-5% by weight of additives based on the total weight of the mixture;

[0033] d) 0.02-5.0% by weight of polymer, based on the total weight of the mixture;

[0034] 2) adding 10-60% by weight of binder based on the total weight of the mixture to the mixture obtained in step 1);

[0035] 3) kneading the mixed material obtained in step 2) evenly, extruding and drying to obtain a green body;

[0036] 4) Calcining the green body to obtain the alumina carrier.

[0037] In the present invention, the tri...

Embodiment approach

[0058] The silver catalyst of the present invention can be prepared by conventional preparation methods in the art. According to a preferred embodiment, the preparation method of silver catalyst comprises the following steps:

[0059] 1) impregnating the alumina carrier prepared by the above-mentioned preparation method or the above-mentioned alumina carrier with a solution containing silver compound, organic amine, alkali metal and / or alkaline earth metal promoter, rhenium-containing promoter and optional co-promoter ;

[0060] 2) activating and thermally decomposing the alumina carrier impregnated in step 1) at 120-350° C. to obtain the silver catalyst.

[0061] In the present invention, the silver compound may be silver oxide or silver salt, and the silver salt is silver nitrate, silver carbonate and the like.

[0062] The organic amine can be any organic amine compound suitable for preparing silver catalysts for ethylene oxide production, as long as the organic amine com...

Embodiment 1

[0085] 50-500 mesh α-trihydrate A1 2 o 3 390g, more than 200 mesh fake monohydrate A1 2 o 3 110g, aluminum fluoride 8g, SiO 2 0.6g, MgSO 4 1.5g and 8.6g of polymethyl methacrylate are put into a mixer and mixed evenly, transferred to a kneader, and 90ml of dilute nitric acid (nitric acid: water = 1:3, weight ratio) is added, and kneaded to form an extrudable of paste. 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 more than 2 hours to reduce the free water content to below 10%. Then put the green body into the electric furnace, raise it from room temperature to 1250°C after about 18 hours, and keep the temperature constant for 4 hours to obtain white α-A1 2 o 3 Carrier samples.

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Abstract

The invention belongs to the technical field of catalysts, and discloses an alumina carrier, a preparation method thereof, a silver catalyst and application. The preparation method comprises the following steps: 1) preparing a mixture comprising the following components: a) 50-90% by weight of alpha-Al2O3 trihydrate based on the total weight of the mixture; b) 5-50% by weight of pseudo Al2O3 monohydrate based on the total weight of the mixture; c) 0-5% by weight of an auxiliary agent based on the total weight of the mixture; d) 0.02-5.0 wt% of a polymer based on the total weight of the mixture; 2) adding a binder accounting for 10-60% of the total weight of the mixture into the mixture obtained in the step 1); (3) uniformly kneading the mixed material obtained in the step (2), carrying out extrusion molding, and drying to obtain a green body; and 4) roasting the green body to obtain the alumina carrier. The preparation method can reduce the shrinkage rate of the carrier, and the prepared carrier does not affect the catalytic performance of the catalyst.

Description

technical field [0001] The invention belongs to the technical field of catalysts, and more specifically relates to an alumina carrier and a preparation method thereof, a silver catalyst and the application of the silver catalyst in the production of ethylene oxide by oxidizing ethylene. 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 use of silver catalysts with high activity, high selectivity and good stability in the process of ethylene oxidation to produce ethylene oxide can greatly improve economic benefits, so the manufacture of silver catalysts with high activity, high selectivity and good stability is a silver catalyst research main direction. The performance of the silver catalyst not only has an important relation...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J21/04B01J32/00B01J21/14B01J35/10B01J37/00B01J37/08B01J23/68B01J37/02C07D301/10C07D303/04
CPCB01J21/04B01J21/14B01J37/0018B01J37/082B01J23/688B01J23/002B01J37/0213B01J37/088B01J37/086C07D301/10C07D303/04B01J2523/00B01J35/30B01J35/612B01J35/633B01J35/635B01J2523/18B01J2523/22B01J2523/31B01J2523/41B01J2523/67B01J2523/74
Inventor 廉括魏会娟林伟蒋赛屈进王辉任冬梅
Owner CHINA PETROLEUM & CHEM CORP