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α-alumina carrier for silver catalyst and its preparation method and application

A technology of alumina carrier and silver catalyst, which is applied in the direction of catalyst carrier, chemical instruments and methods, physical/chemical process catalysts, etc., and can solve the problems of carrier specific surface reduction, active component aggregation, and technology popularization and application affecting the service life of catalysts, etc.

Active Publication Date: 2020-07-24
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the calcination process, alumina undergoes phase change and sintering, which causes a large decrease in the specific surface of the carrier, which will cause the aggregation of the supported active components and deactivation of the catalyst, which greatly affects the service life of the catalyst and the popularization and application of the technology.

Method used

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  • α-alumina carrier for silver catalyst and its preparation method and application
  • α-alumina carrier for silver catalyst and its preparation method and application
  • α-alumina carrier for silver catalyst and its preparation method and application

Examples

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preparation example Construction

[0039] The preparation method of the α-alumina carrier involved in the second aspect of the present invention comprises:

[0040] Step A, mixing alumina trihydrate, pseudoboehmite, gallium-containing compounds, silicon-containing compounds, alkaline earth metal compounds and fluoride-containing compounds to obtain a solid mixture;

[0041] Step B, adding a binder and water to the solid mixture to obtain an α-alumina precursor mixture;

[0042] In step C, the α-alumina precursor mixture is kneaded, shaped, dried and calcined to obtain an α-alumina carrier.

[0043] In the present invention, alumina trihydrate and pseudo-boehmite are used as precursors to be converted into α-alumina through high-temperature calcination. In some implementations of the present invention, for example, in step A, the mass ratio of alumina trihydrate to pseudo-boehmite is (0.5-8.0):1.

[0044] In the present invention, the alumina trihydrate includes one or more of gibbsite, pyrenite and nogisite. ...

Embodiment 1

[0085] (1) Preparation of carrier: Weigh 360.0g gibbsite, 240.0g pseudoboehmite, 6.0g ammonium fluoride, 2.0g barium sulfate, 2.5g sodium silicate, 0.9g gallium sulfate, put into the mixture Mix evenly in the container, transfer to the kneader, add dilute nitric acid (nitric acid: water = 1:3, volume ratio) until kneaded into a paste that can be extruded, put the paste into the extruder, Extrude into a seven-hole column, dry at 60-120°C for more than 24 hours to reduce the free water content to below 10%, and then put the dried seven-hole column into a natural gas kiln for roasting at 1300°C , roasted at constant temperature for 20h, and finally cooled to room temperature to obtain α-alumina carrier. The relevant physical property data of the α-alumina carrier prepared in Example 1 are shown in Table 1.

[0086] (2) Preparation of catalyst: take by weighing 140g silver nitrate and dissolve in 150ml deionized water, take by weighing 64g ammonium oxalate and dissolve in 520ml dei...

Embodiment 2

[0089] (1) Preparation of carrier: Weigh 360.0g gibbsite, 240.0g pseudoboehmite, 6.0g ammonium fluoride, 2.0g barium sulfate, 4.0g sodium silicate, 0.2g gallium oxide, put into the mixture Mix evenly in the container, transfer to the kneader, add dilute nitric acid (nitric acid: water = 1:3, volume ratio) until kneaded into a paste that can be extruded, put the paste into the extruder, Extrude into a seven-hole column, dry at 60-120°C for more than 24 hours to reduce the free water content to below 10%, and then put the dried seven-hole column into a natural gas kiln for roasting at 1300°C , roasted at constant temperature for 10h, and finally cooled to room temperature to obtain α-alumina carrier. The relevant physical property data of the α-alumina carrier prepared in Example 2 are shown in Table 1.

[0090] (2) The preparation method of the catalyst is the same as in Example 1.

[0091] (3) The performance evaluation of the catalyst is the same as in Example 1, and the mi...

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Abstract

The invention relates to an alpha-alumina carrier used for a silver catalyst and a preparation method thereof. The preparation method includes the steps of: uniformly mixing aluminum oxide trihydrate, pseudo-boehmite, a gallium-containing compound, a silicon-containing compound, a fluorine-containing compound and an alkaline earth metal compound to obtain a solid powder; adding a binder and water to prepare a mixture; and kneading, shaping, drying and roasting the mixture to obtain the alpha-alumina carrier. The invention also relates to the silver catalyst produced with the alpha-alumina carrier and an application of the catalyst for producing epoxy compounds through epoxidation of olefins.

Description

technical field [0001] The invention belongs to the technical field of catalyst carrier and catalyst preparation, and relates to an alpha-alumina carrier used for silver catalysts, a preparation method and application thereof. Background technique [0002] So far, silver catalysts are still the only effective catalysts for the industrial epoxidation of ethylene to ethylene oxide. In the prior art, silver catalysts usually have one or more other elements co-deposited on the carrier to improve the catalytic performance of the silver catalyst in addition to the silver component. α-alumina composition. In addition to the important relationship between the performance of the silver catalyst and the composition and preparation method of the catalyst, it also has an important relationship with the preparation method and performance of the carrier used in the catalyst. [0003] Materials for preparing α-alumina supports for silver catalysts generally include: α-alumina powder and / ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/08B01J23/66C07D303/04C07D301/03
CPCB01J23/08B01J23/66C07D301/03C07D303/04
Inventor 王辉魏会娟林伟李金兵曹淑媛梁汝军孙欣欣代武军蒋文贞
Owner CHINA PETROLEUM & CHEM CORP
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