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Method for preparing α-alumina carrier for silver catalyst

A technology of alumina carrier and silver catalyst, which is applied in the direction of catalyst carrier, chemical instruments and methods, alumina/aluminum hydroxide, etc., can solve the problems of low catalyst activity and selectivity, achieve broad industrial application prospects, reduce emissions, The effect of improving the utilization rate

Active Publication Date: 2016-11-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

EP0150238 (US4428863) uses a small amount of barium aluminate or barium silicate binder in the manufacturing process of high-purity, low-surface alumina carrier, claiming that it can improve the crushing strength and wear resistance of the carrier, and the specific surface of the prepared carrier is less than 0.3m 2 / g, the activity and selectivity of the prepared catalyst are relatively low

Method used

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  • Method for preparing α-alumina carrier for silver catalyst
  • Method for preparing α-alumina carrier for silver catalyst

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] 498g trihydrate α-alumina, 102g fake monohydrate A1 2 o 3, 10.5g of ammonium fluoride and 20g of aluminum sulfate are put into the mixer and mixed evenly; 120ml of dilute nitric acid solution (nitric acid: water = 1:3, volume ratio) is poured into the kneader, and kneaded into an extrudable shape of paste. Put the paste into the extruder, extrude it into a column with an outer diameter of 8.0mm and a length of 6.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10wt%. Put the dried column into a natural gas kiln, raise from room temperature to 1350°C over 30 hours, and then keep the temperature for 5 hours to obtain α-A1 2 o 3 Carrier, its relevant physical performance data are shown in Table 2.

Embodiment 2

[0029] 498g trihydrate α-alumina, 102g fake monohydrate A1 2 o 3 , 10.5g of ammonium fluoride and 20g of aluminum nitrate were put into the mixer and mixed evenly; 120ml of dilute nitric acid solution (nitric acid: water = 1:3, volume ratio) was poured into the kneader, and kneaded into a form that could be extruded of paste. Put the paste into the extruder, extrude it into a column with an outer diameter of 8.0mm and a length of 6.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10wt%. Put the dried column into a natural gas kiln, raise from room temperature to 1350°C over 30 hours, and then keep the temperature for 5 hours to obtain α-A1 2 o 3 Carrier, its relevant physical performance data are shown in Table 2.

[0030] Table 2

[0031] carrier number

[0032] As can be seen from Table 2, according to the α-A1 provided by the present invention 2 o 3 The carrier has appropriate mechanical strength and specific surfa...

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Abstract

The invention provides a method for preparing an alpha-alumina carrier used for a silver catalyst, which comprises the following steps: 1)preparing a mixture containing trihydrate alpha-alumina and / or beta-trihydrate alumina, pseudo-hydrated alpha-alumina, a fluoride and aluminum salt mixing the mixture and a acid solution; wherein the aluminum salt is selected from aluminum sulfate, aluminum nitrate, aluminum halide, aluminum isopropoxide and aluminum potassium sulfate; based on total weight of the mixture, the content of fluoride accounts for 0.01-3.0wt%, the content of aluminum salt accounts for 0. 1-20.0wt%; and step 2), the mixture obtained via step 1) is mixed uniformly, is subjected to extrusion molding, is dried, and is roasted so as to obtain the alpha-aluminum oxide carrier. According to the method, the silver catalyst prepared by the alpha-aluminum oxide carrier added with aluminum salt is used for preparing ethylene oxide through ethylene epoxidation, reaction selectivity can be obviously increased, and the method has wide application prospect.

Description

technical field [0001] The present invention relates to a method for preparing a carrier for silver catalysts, and more particularly, the present invention relates to a method for preparing an α-alumina carrier for silver catalysts for ethylene oxide production of ethylene oxide. The present invention also relates to the alumina carrier obtained by the above preparation method and the silver catalyst obtained by using the above carrier. 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. Activity refers to the reaction temperature required when the ethylene oxide production process reaches a certain reaction load; the lower the reaction temperature, the higher the activity of the catalyst. Selectivity refers to the ratio of the mo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J21/04B01J23/50C01F7/02C07D303/04C07D301/10
CPCY02P20/52
Inventor 林伟王辉林强张志祥李金兵曹淑媛薛茜高立新
Owner CHINA PETROLEUM & CHEM CORP