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Alumina carrier for silver catalyst and catalyst

A technology of alumina carrier and silver catalyst, applied in catalyst carrier, physical/chemical process catalyst, metal/metal oxide/metal hydroxide catalyst, etc., can solve the problems of reducing the packing density and loading amount of catalyst bed, etc. Achieve the effect of optimizing bed accumulation state, optimizing accumulation state and stable performance

Inactive Publication Date: 2015-05-20
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The catalyst carrier can be made with more pores and shapes. The advantage of this is that it increases the porosity of the carrier, reduces the pressure drop of the bed, and is conducive to mass and heat transfer to improve the performance of the catalyst; the disadvantage is that the bed accumulation of the catalyst is reduced. Density and Fill (weight)

Method used

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  • Alumina carrier for silver catalyst and catalyst
  • Alumina carrier for silver catalyst and catalyst
  • Alumina carrier for silver catalyst and catalyst

Examples

Experimental program
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Effect test

Embodiment 1

[0041] Such as figure 2 As shown, the alumina support of the present invention includes a columnar portion 2 and an end face portion 1, the two ends of the columnar portion in the axial direction are not connected to the two end face portions 1, and the end face portion 1 includes an end face 3 and a transition face 4 , the transition surface is an arc-shaped transition surface.

[0042] Such as image 3 As shown, the radial cross-section of the alumina carrier of the present invention is circular, and five channels 5 are arranged in the axial direction.

[0043] The diameter of the columnar part of the alumina carrier of this example is 6 mm, and the minimum diameter of the end face part is 3 mm.

[0044]The overall axial length of the alumina support in this embodiment is 8 mm, and the axial length of the end face part is 2 mm.

[0045] Through this arrangement, the loading amount of the catalyst can be significantly increased, the quantity of the catalyst used can be in...

Embodiment 2

[0047] In this embodiment, the alumina carrier of the present invention includes a columnar portion and an end face portion, the two ends of the columnar portion in the axial direction are not connected to the two end face portions, and the end face 1 includes an end face and a transition face, so The transition surface is a planar transition surface.

[0048] Such as image 3 As shown, the radial cross-section of the alumina carrier of the present invention is circular, and five channels are arranged in the axial direction.

[0049] The diameter of the columnar part of the alumina carrier of this example is 10 mm, and the minimum diameter of the end face part is 5 mm.

[0050] The overall axial length of the alumina support in this embodiment is 10 mm, and the axial length of the end face part is 4 mm.

[0051] Through this arrangement, the loading amount of the catalyst can be significantly increased, the quantity of the catalyst used can be increased, and the stacking sta...

Embodiment 3

[0054] 100~400 mesh α-trihydrate A1 2 o 3 2310g and more than 180 mesh fake monohydrate A1 2 o 3 695g is put into the mixing machine, transfers to the kneader after mixing evenly, adds 560 milliliters of dilute nitric acid, after being kneaded into a paste that can be pressed and molded, put it into the molding machine. Replace the mold with cylindrical mold 01 with a rounded rectangular longitudinal section, press and form a seven-hole column with an outer diameter of 8.0mm, a length of 7.0mm, and an inner diameter of 1.1mm, and dry it at 90-110°C for more than 1 hour to make the free The water content is reduced to below 10%. Then put the green body into an electric furnace, raise it from room temperature to 1250°C to 1350°C after about 25 hours, and keep the temperature constant for 1.5 hours to obtain white α-A1 2 o 3 Carrier samples. See Table 3 for the data.

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Abstract

The invention discloses an alumina carrier for a silver catalyst. The alumina carrier comprises a columnar part and an end face part, wherein the end face part is sphere-crown-shaped and is directly connected to the columnar part, or the end face part comprises an end face and a transitional surface of which the end face is connected with the side face of the columnar part. The invention also relates to a preparation method of the alumina carrier, which comprises the steps of mixing alpha-trihydrate Al2O3 with pseudo-monohydrate Al2O3, and carrying out compression moulding on the obtained mixture so as to obtain the alumina carrier. The invention also discloses a silver catalyst using the alumina carrier.

Description

technical field [0001] The invention relates to an alumina carrier and a catalyst. Specifically, the present invention relates to an alumina support for silver catalysts and the silver catalyst. Background technique [0002] At present, the production of ethylene oxide in the world adopts the direct oxidation method of ethylene with pure oxygen, and the silver catalyst is the only effective catalyst for the selective oxidation reaction of ethylene and oxygen to produce ethylene oxide. Under the action of silver catalyst, ethylene epoxidation mainly produces ethylene oxide, and at the same time, side reactions produce carbon dioxide and water, among which selectivity, stability and activity are the main performance indicators of silver 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 s...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J35/02B01J23/50C07D301/10C07D303/04
Inventor 蒋文贞李金兵陈建设张志祥蒋军王辉代武军崔宝林
Owner CHINA PETROLEUM & CHEM CORP