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Alpha-alumina carrier of silver catalyst for olefin epoxidation, preparation and application thereof

A technology of alumina carrier and silver catalyst, which is applied in the direction of catalyst carrier, metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, etc. Evenly distributed and other issues

Active Publication Date: 2017-07-18
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the specific surface area of ​​the α-alumina carrier is too low, it is not conducive to the uniform dispersion of active components on the carrier; if the pore volume of the α-alumina carrier is too low, it is not conducive to the timely absorption of reactants or products during the catalytic reaction process. Desorption, but also cause the heat generated by the reaction to not be taken away in time, and the local temperature is too high, resulting in reduced performance or even deactivation of the silver catalyst
[0005] Most of the existing technologies improve the specific surface area and pore volume of the α-alumina carrier through thermally decomposable burnout materials and additives, but there are few existing technologies that can simultaneously improve the specific surface area and pore volume

Method used

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  • Alpha-alumina carrier of silver catalyst for olefin epoxidation, preparation and application thereof
  • Alpha-alumina carrier of silver catalyst for olefin epoxidation, preparation and application thereof
  • Alpha-alumina carrier of silver catalyst for olefin epoxidation, preparation and application thereof

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preparation example Construction

[0038] According to some specific embodiments of the present invention, the preparation method of the α-alumina carrier involved in the second aspect of the present invention as in the first aspect of the present invention includes the following steps:

[0039] (1) Prepare a solid mixture with the following composition:

[0040] Component a, 5.0%-90.0% (weight) of alumina trihydrate based on the total weight of the solid mixture;

[0041] Component b, 5.0%-85.0% (weight) pseudo-boehmite of the total weight of the solid mixture;

[0042] Component c, 0.1%-8.0% (by weight) of heavy alkaline earth metal compounds of the total weight of the solid mixture;

[0043] Component d, 0.1%-10.0% (weight) of fluorine compound based on the total weight of the solid mixture;

[0044] (2) Adding component e binder and water to the solid mixture obtained in step (1) to prepare an α-alumina carrier precursor mixture;

[0045] (3) The α-alumina carrier precursor mixture obtained in step (2) is kneaded, shap...

Embodiment 1

[0084] (1) Preparation of carrier: Weigh 427.0g of gibbsite, 71.0g of diaspore, 102.0g of pseudo-boehmite, 10.0g of ammonium fluoride, and 4.0g of barium sulfate, put them in a mixer and mix them evenly. Transfer to the kneader, add dilute nitric acid (nitric acid: water = 1:3, weight ratio, the density of nitric acid is 1.07g / cm 3 ) Until it is kneaded into an extrudable paste, put the paste into an extruding machine and squeeze it into a five-hole column, and dry it at 60-120℃ for more than 24 hours to reduce the free water content to 10% Next, put the dried five-hole pillars into a natural gas kiln for roasting at a roasting temperature of 1300° C., roasting at a constant temperature for 10 hours, and finally cooling to room temperature to obtain an α-alumina carrier. See Table 2 for the relevant physical property data of the α-alumina carrier in this example.

[0085] (2) Preparation of catalyst: Add 60.0g ethylenediamine, 22.0g ethanolamine, 75.0g deionized water, silver oxa...

Embodiment 2

[0088] (1) Preparation of carrier: Weigh 398.0g gibbsite, 100.0g diaspore, 102.0g pseudo-boehmite, 10.0g ammonium fluoride, 7.0g barium sulfate, put them in a mixer and mix them evenly. Transfer to the kneader, add dilute nitric acid (nitric acid: water = 1:3, weight ratio, the density of nitric acid is 1.07g / cm 3 ) Until it is kneaded into an extrudable paste, put the paste into an extruding machine and squeeze it into a five-hole column, and dry it at 60-120℃ for more than 24 hours to reduce the free water content to 10% Next, the dried five-hole pillars are then put into a natural gas kiln for roasting at a roasting temperature of 1350° C., roasting at a constant temperature for 10 hours, and finally cooling to room temperature to obtain an α-alumina carrier. Table 2 shows the relevant physical property data of the α-alumina carrier in this example.

[0089] (2) The preparation of the catalyst is the same as in Example 1.

[0090] (3) The performance evaluation of the catalyst ...

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Abstract

The invention relates to an alpha-alumina carrier of a silver catalyst for olefin epoxidation and a preparation method thereof. The alpha-alumina carrier prepared by adding gibbsite and bayerite with proper weight proportion in the preparation process of the carrier has higher specific surface area and pore volume. The invention also relates to the silver catalyst prepared by the alpha-alumina carrier and an application thereof in production of ethylene oxide by ethylene epoxidation, and the silver catalyst is used in production of the ethylene oxide by ethylene epoxidation, and has higher activity and selectivity.

Description

Technical field [0001] The invention belongs to the technical field of catalyst carrier and catalyst preparation, and in particular relates to an alpha-alumina carrier of a silver catalyst for olefin epoxidation and its preparation and application. Background technique [0002] In the reaction of olefin epoxidation to produce epoxy compounds, under certain reaction conditions, the reaction mixture containing olefin and oxygen reacts under the action of a catalyst to produce epoxy compounds and a small amount of by-products such as carbon dioxide and water. Among them, activity, selectivity and stability are the main performance indicators of silver catalysts. 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 selectivity refers to the number of moles of ethylene converted into ethylene oxide and the amount of ethylene in th...

Claims

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Application Information

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IPC IPC(8): B01J32/00B01J21/04B01J23/68C07D301/10C07D303/04
Inventor 王辉李金兵曹淑媛汤之强高立新薛茜孙向华何学勤李秀聪
Owner CHINA PETROLEUM & CHEM CORP
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