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Preparation method of silver catalyst carrier for production of ethylene oxide and application thereof

A silver catalyst, catalyst technology, applied in catalyst carriers, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing the specific surface of the carrier, increasing the mechanical strength, and reducing the performance of the silver catalyst, etc. problem to achieve high activity and selectivity

Active Publication Date: 2015-06-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Affected by industrial production, the raw material of alumina trihydrate is refined, and the finer particle size of the raw material directly leads to changes in the pore structure of the carrier. Still using a higher calcination temperature will further close the pores in the carrier, increase the mechanical strength, and reduce the water absorption. At the same time, the specific surface area of ​​the carrier is also reduced, which is not conducive to the dispersion of active components and additives, thereby reducing the performance of the silver catalyst

Method used

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  • Preparation method of silver catalyst carrier for production of ethylene oxide and application thereof
  • Preparation method of silver catalyst carrier for production of ethylene oxide and application thereof
  • Preparation method of silver catalyst carrier for production of ethylene oxide and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Preparation of vector

[0051] 250~500 mesh trihydrate α-Al 2 o 3 3587g, fake monohydrate Al greater than 200 mesh 2 o 3 1196g, NH 4 Put 150g of F and 25g of barium nitrate into a mixer and mix evenly, transfer to a kneader, add 42g of Vaseline and 2100ml of dilute nitric acid (concentrated nitric acid: water = 1:3, weight ratio), and knead into a paste that can be extruded shape. 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%. Put the above kneaded carrier into a bell kiln, raise it from room temperature to 1280°C over 33 hours, and calcinate at 1280°C for 10 hours to obtain white α-Al 2 o 3 carrier. The measured carrier physical property data and pore structure distribution data are shown in Tables 1 and 2 below, respectively.

[0052] Catalyst preparation

[0053] Dissolve 980g of ethylenediamine a...

Embodiment 2

[0057] The preparation of the carrier is the same as in Example 1, except that the trihydrate α-Al 2 o 3 3986g and fake Al monohydrate 2 o 3 797g. The obtained carrier physical property data and pore structure distribution data are shown in Tables 1 and 2 below, respectively.

Embodiment 3

[0059] The preparation of the carrier is the same as in Example 1, except that the trihydrate α-Al 2 o 3 3826g and fake Al monohydrate 2 o 3 957g. The obtained carrier physical property data and pore structure distribution data are shown in Tables 1 and 2 below, respectively. The preparation of the catalyst is the same as in Example 1, and the test results of the catalyst are shown in Table 3.

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Abstract

The invention provides an alpha alumina carrier of a medium-selectivity silver catalyst. The preparation method of the carrier comprising the following steps of: preparing a solid mixture comprising the following components: 45-85% of trihydrate alpha-Al2O3 with the granularity of 250-500 mesh, 10-55% of pseudo monohydrate Al2O3 with the granularity being more than 200 mesh, 0.01-5.0% of combustible lubricating material, 0.05-8.0% of fluoride mineralizer, and 0.01-5.0% of heavy alkaline-earth metal compound; kneading and forming the solid mixture, binder and water, wherein the use amount of the binder is 25-60wt% of the total weight of the solid mixture; and drying the product obtained in the previous step, and roasting at 1200-1400 DEG C to form the carrier, wherein in the carrier, in terms of the total pore volume, holes with the pore diameter of 0.5-2.5mu m are 60-90%. The medium-selectivity silver catalyst prepared from the carrier provided by the invention is applied to epoxidation reaction in which the inlet CO2 concentration of a reaction device is 1-3mol%, and is particularly applied to production of ethylene oxide through ethylene oxidization; and the activity and the selectivity are high.

Description

technical field [0001] The present invention relates to a kind of carrier for silver catalyst, its preparation method and application thereof, more specifically the present invention relates to a kind of alumina carrier for silver catalyst of ethylene oxidation production ethylene oxide, its preparation method and The medium-selectivity silver catalyst prepared by the carrier also relates to the application of the catalyst in ethylene oxidation to produce ethylene oxide. 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; the sel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/66C07D301/10C07D303/04
CPCY02P20/52
Inventor 任冬梅陈建设李金兵王淑娟林强曹淑媛李贤丰高立新
Owner CHINA PETROLEUM & CHEM CORP
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