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A modified α-alumina carrier and its preparation and application

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

Active Publication Date: 2019-04-19
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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preparation example Construction

[0065] A second aspect of the present invention provides a method for preparing a modified α-alumina carrier as described in the first aspect of the present invention, comprising:

[0066] Step A, mixing components a-g to prepare a nickel-containing α-alumina carrier precursor mixture;

[0067] Step B, forming the nickel-containing α-alumina carrier precursor mixture, drying and calcining to obtain the nickel-containing α-alumina carrier;

[0068] Step C, subjecting the nickel-containing α-alumina carrier to acid treatment to obtain a modified α-alumina carrier precursor;

[0069] Step D, washing, drying and calcining the modified α-alumina carrier precursor to obtain a modified α-alumina carrier;

[0070] Wherein, in step C, the nickel-containing α-alumina support is subjected to acid treatment with an aqueous solution of an acidic compound.

[0071] According to the method of the present invention, the composition of the nickel-containing α-alumina support precursor mixtur...

Embodiment 1

[0143] 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

[0145] 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 supporter and a preparation method thereof. The modified alpha-alumina supporter is prepared by adding the nickel element during a supporter preparation process and performing acid treatment on a formed alpha-alumina supporter. The invention further relates to a silver catalyst which takes the modified alpha-alumina as the supporter and a preparation method for the silver catalyst. The silver catalyst which takes the modified alpha-alumina as the supporter shows good activity and selectivity in producing ethylene oxide through ethylene oxidation. Raw materials for preparing the modified alpha-alumina supporter are easily available, and the preparation method is simple in procedure. The modified alpha-alumina supporter 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 particularly relates to a modified α-alumina carrier and its preparation and application. Background technique [0002] Ethylene oxide mainly produces ethylene oxide under the action of silver catalyst, and side reactions also 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 to the total reaction moles of ethylene in the reaction. The so-called stability is expressed as the decline rate of activity and selectivity, the smaller the decline rate, the better ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/755B01J23/89C07D303/04C07D301/03C07D301/10
CPCY02P20/52
Inventor 李贤丰林伟林强李金兵孙欣欣曹淑媛任冬梅王淑娟
Owner CHINA PETROLEUM & CHEM CORP
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