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A kind of α-alumina carrier and its preparation method and application

An alumina carrier and alumina technology, which is applied in catalyst carriers, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of reducing the specific surface area of ​​α-alumina carrier and sintering alumina particles. Reunion, etc.

Active Publication Date: 2020-04-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

During this high-temperature calcination process, the alumina particles will sinter and agglomerate, resulting in a sharp decrease in the specific surface area of ​​the prepared α-alumina carrier.

Method used

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  • A kind of α-alumina carrier and its preparation method and application

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preparation example Construction

[0037] The preparation method of the α-alumina carrier involved in the second aspect of the present invention comprises the following steps:

[0038] Step A, mixing alumina trihydrate, alumina monohydrate, gallium-containing compounds and optional alkaline earth metal compounds and / or fluorides to obtain a solid mixture;

[0039] Step B, adding a binder and water to the solid mixture to obtain an α-alumina precursor mixture;

[0040] In step C, the α-alumina precursor mixture is kneaded, shaped, dried and calcined to obtain an α-alumina carrier.

[0041] In the method for preparing the α-alumina carrier of the present invention, the alumina trihydrate and alumina monohydrate are used as aluminum sources and converted into α-alumina after being calcined. The alumina trihydrate includes gibbsite and / or pyrenite, whose mass accounts for 20%-90% of the total mass of the solid mixture. The alumina monohydrate includes boehmite and / or diaspore, whose mass accounts for 5%-50% of th...

Embodiment 1

[0068] Weigh 480.0g of pyrenite, 120.0g of boehmite, 11.0g of ammonium fluoride, 3.0g of barium sulfate, and 1.5g of gallium hydroxide, put them into a mixer and mix evenly, transfer them to a kneader, and add Dilute nitric acid (nitric acid: water = 1:3, volume ratio) until it is kneaded into a paste that can be extruded. Put the paste into the extruder and extrude it into a seven-hole column. Dry for more than 24 hours to reduce the free water content to less than 10%, then put the dried seven-hole column into a natural gas kiln for roasting at a temperature of 1350°C, roast at a constant temperature for 25 hours, and finally cool to room temperature to obtain α- Alumina carrier. The relevant physical property data of the α-alumina carrier prepared in this example are shown in Table 1.

Embodiment 2

[0070] Weigh 480.0g of pyrenite, 120.0g of boehmite, 11.0g of ammonium fluoride, 3.0g of barium sulfate, and 15.0g of gallium hydroxide, put them into a mixer and mix evenly, transfer them to a kneader, and add Dilute nitric acid (nitric acid: water = 1:3, volume ratio) until it is kneaded into a paste that can be extruded. Put the paste into the extruder and extrude it into a seven-hole column. Dry for more than 24 hours to reduce the free water content to less than 10%, then put the dried seven-hole column into a natural gas kiln for roasting at a temperature of 1300°C, roast at a constant temperature for 25 hours, and finally cool to room temperature to obtain α- Alumina carrier. The relevant physical property data of the α-alumina carrier prepared in this example are shown in Table 1.

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Abstract

The invention relates to an α-alumina carrier and its preparation method and application. In the present invention, a certain amount of gallium-containing compound additive is added during the preparation process of the carrier, and the mass content of gallium element in the carrier is 0.02%-15.00%. The specific preparation process is: mix alumina trihydrate, pseudo-boehmite, gallium-containing compounds and optional alkaline earth metal compounds and / or fluoride to obtain a solid mixture, add a binder and water to the solid mixture, An α-alumina precursor mixture is obtained, and the precursor mixture is kneaded, shaped, dried, and calcined to finally prepare an α-alumina carrier. The catalyst carrier prepared by the invention can be used in olefin epoxidation reaction, selective hydrogenation of alkynes and dienes, and methane reforming reaction.

Description

technical field [0001] The invention belongs to the technical field of catalyst carriers, and relates to an α-alumina carrier and its preparation method and application. Background technique [0002] Alumina materials have always been one of the key and hot research objects in the fields of materials science and catalysis, and great progress has been made in the fields of fine ceramics, composite materials, adsorption separation, and catalysis. Especially in the field of petrochemical catalysis, alumina supports with different shapes are widely used in catalytic oxidation and catalytic hydrogenation. Alumina carrier plays a very important role in the catalyst, such as: improving the dispersion of active components, reducing the amount of active components, increasing the effective specific surface, improving the thermal stability of the catalyst, etc. The performance of the alumina carrier is the key to the performance of the catalyst. one of the key factors. [0003] Alum...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J32/00B01J23/08
CPCB01J23/08B01J35/612
Inventor 王辉魏会娟蒋军李金兵曹淑媛梁汝军代武军王淑娟孙向华
Owner CHINA PETROLEUM & CHEM CORP
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