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A modified α-alumina carrier and its preparation and application

A technology of alumina support and modification, applied in catalyst support, chemical instruments and methods, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problem of poor activity, poor selectivity and good activity And other issues

Active Publication Date: 2019-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Currently, silver catalysts on the market either have good selectivity but not very good activity; or have good activity but not very good selectivity

Method used

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  • A modified α-alumina carrier and its preparation and application
  • A modified α-alumina carrier and its preparation and application
  • A modified α-alumina carrier and its preparation and application

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Experimental program
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preparation example Construction

[0071] The second aspect of the present invention provides a method for preparing the modified α-alumina carrier as described in the first aspect of the present invention, which includes:

[0072] Step A, mixing components a-g to prepare a cobalt-containing α-alumina carrier precursor mixture;

[0073] Step B, molding the cobalt-containing α-alumina carrier precursor mixture, drying and calcining to obtain a cobalt-containing α-alumina carrier;

[0074] Step C, treating the cobalt-containing α-alumina carrier with an acid solution to obtain a modified α-alumina carrier precursor;

[0075] Step D, washing, drying and calcining the modified α-alumina carrier precursor to obtain a modified α-alumina carrier;

[0076] Wherein, in step C, the cobalt-containing α-alumina carrier is treated with an acid solution using an aqueous solution of an acidic compound.

[0077] According to the method of the present invention, the composition of the cobalt-containing α-alumina carrier precu...

Embodiment 1

[0151] Prepare 400 g of 0.5 mol / L HNO at a weight ratio of α-alumina carrier to aqueous acidic compound solution of 1:20 3 solution, and the HNO 3 Heat the solution to 80°C, weigh 20g Z-2 carrier and put it into HNO 3 After the solution was stirred for 0.5 h, the acid liquid α-alumina carrier precursor was taken out and washed with deionized water until the pH value of the filtrate was about 7. Then put the acid liquid α-alumina carrier precursor into an oven and dry at 100°C for 10 hours, and then put the dried acid liquid α-alumina carrier precursor into a muffle furnace and roast at 540°C for 4 hours to obtain a modified α - Alumina support. The prepared modified α-alumina carrier was named Z-4, and its crushing strength, water absorption and specific surface area were measured. The results are shown in Table 2.

Embodiment 2

[0153]Prepare 400g of 0.01mol / L HNO at a weight ratio of α-alumina carrier to aqueous acidic compound solution of 1:20 3 solution, and the HNO 3 Heat the solution to 80°C, weigh 20g Z-2 carrier and put it into HNO 3 After the solution was stirred for 0.5 h, the acid liquid α-alumina carrier precursor was taken out and washed with deionized water until the pH value of the filtrate was about 7. Then put the acid liquid α-alumina carrier precursor into an oven and dry at 100°C for 10 hours, and then put the dried acid liquid α-alumina carrier precursor into a muffle furnace and roast at 540°C for 4 hours to obtain a modified α - Alumina support. The prepared modified α-alumina carrier was named Z-5, and its crushing strength, water absorption and specific surface area were measured, and the results are shown in Table 2.

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Abstract

The invention relates to a modified alpha-alumina carrier and a preparation method thereof. Cobalt is used in carrier preparation and the molded alpha-alumina carrier is subjected to acid treatment so that the modified alpha-alumina carrier is obtained. The invention also relates to a silver catalyst using the modified alpha-alumina carrier and a preparation method of the silver catalyst. The silver catalyst supported by the modified alpha-alumina carrier has good activity and selectivity in the ethylene oxidation production of ethylene oxide. The preparation method utilizes easily available raw materials and has simple processes. The modified alpha-alumina carrier and the silver catalyst have a wide application prospect.

Description

technical field [0001] The invention belongs to the technical field of catalyst carrier and catalyst preparation, and in particular relates to a modified α-alumina carrier and its preparation and application. 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 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 reaction to the total reaction moles of ethylene. The so-called stability is expressed as the decline rate of activity and selectivity, and the smaller...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/78B01J23/89B01J27/138B01J32/00C07D303/04C07D301/10
CPCY02P20/52
Inventor 李贤丰林伟任冬梅李金兵孙欣欣高立新蒋文贞王辉
Owner CHINA PETROLEUM & CHEM CORP
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