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Alumina carrier, preparation method, silver catalyst prepared by alumina carrier, and application thereof

A technology of alumina carrier and silver catalyst, applied in the direction of metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, catalyst carrier, etc.

Active Publication Date: 2012-05-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention uses nitric acid, hydrochloric acid, sulfuric acid, phosphoric acid, oxalic acid and other acids to treat the α-alumina carrier with pKa≤3, and then uses formaldehyde solution to reduce silver to prepare silver catalyst, but the highest selectivity is only about 80%

Method used

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  • Alumina carrier, preparation method, silver catalyst prepared by alumina carrier, and application thereof
  • Alumina carrier, preparation method, silver catalyst prepared by alumina carrier, and application thereof
  • Alumina carrier, preparation method, silver catalyst prepared by alumina carrier, and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0091] Example Vectors C, D and E

[0092] Take 120 g of the carrier A obtained above and place it in an acid-resistant plastic cup, inject 240 g of an oxalic acid aqueous solution with a pH value of 0.75 at 25°C into it, soak it at room temperature for 40 minutes, then remove the solution by leaching, soak and wash the sample with 150 g of distilled water for 20 minutes, and drain Water was removed by filtration, washed four times until the pH value of the leachate was greater than 5, and then dried in a flowing air stream at 260° C. for 10 minutes to obtain carrier C. The specific surface area of ​​carrier C is 0.98m 2 / g, water absorption rate 50.8%, total pore volume 0.62ml / g, lateral pressure strength 72 Newton / grain, alkaline earth metal magnesium content 0.48wt%.

[0093] The same as the preparation process of carrier C, the difference is: after washing, it is dried in a flowing air stream at 400° C. for 5 minutes to prepare carrier D. The specific surface area of ​...

Embodiment 1、2 and 3

[0128] Take each 10g of carriers C, D and E, place them in a vacuumable container respectively, evacuate to less than 10mmHg, and put them into the silver-containing impregnated solution described in Comparative Examples 1 and 2 of the above "Catalyst Preparation" section respectively. Liquid X 20g, immerse the carrier, keep it for 30 minutes, then leach to remove the excess solution, then heat it in the air stream of 250°C for 5 minutes, cool down, and prepare the inventive catalysts 1, 2 and 3 respectively, and measure their silver content 18.3%wt, 18.1%wt and 18.3wt%, respectively.

[0129] See Table 5 for the additive contents of comparative catalysts 1 and 2 and inventive catalysts 1, 2 and 3.

[0130] table 5

[0131]

[0132]

[0133] Under the conditions given in the above "Measurement of Catalyst Performance" section, Invention Catalysts 1, 2 and 3 and Comparative Catalysts 1 and 2 were compared and evaluated respectively, wherein the space velocity was 5000h ...

Embodiment 4、5 and 6

[0141] Get each 20g of carrier G, H and I, place in the container that can be vacuumized separately, evacuate to be lower than 10mmHg, add respectively the silver-containing impregnating liquid Y 40g described in the comparative example 3 of the above "catalyst preparation" part , immerse the carrier and keep it for 30 minutes, then leach to remove the excess solution, then heat it in the air flow at 250°C for 5 minutes, and cool it down to prepare the inventive catalysts 4, 5 and 6, whose silver content is respectively 19.1wt after measuring %, 19.0 wt% and 19.2%.

[0142] See Table 7 for the additive contents of comparative catalysts 3 and 4 and inventive catalysts 4, 5 and 6.

[0143] Table 7

[0144]

[0145]Under the conditions given in the "Measurement of Catalyst Performance" section above, Invention Catalysts 4, 5 and 6 and Comparative Catalysts 3 and 4 were simultaneously compared and evaluated respectively, wherein the space velocity was 5000h -1 , the concentra...

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Abstract

The present invention relates to a preparation method for an alumina carrier. The method comprises: (a) mixing alpha-aluminum trihydroxide, pseudo aluminum monohydrate, an alkaline earth metal salt, an optionally burnout carbon-containing material, an optionally fluoride, a binder and water; (b) carrying out extruding and forming; (c) carrying out drying at a temperature of 60-200 DEG C; (d) carrying out baking at the temperature of 1200-1600 DEG C, such that alpha-aluminum oxide is prepared by transformation to obtain a semi-finished carrier;; (e) adopting an organic acid aqueous solution to treat the resulting semi-finished carrier from the step (d), wherein the organic acid can be subjected to thermal decomposition, and the pH value of the organic acid aqueous solution is not more than 2.5; (f) carrying out water washing for the resulting treated carrier from the step (e) until the pH value of the leaching solution is more than 5; and (g) carrying out a further heat treatment at the temperature of 80-1200 DEG C. The present invention further relates to the aluminum oxide carrier prepared by the method, a silver catalyst containing the carrier, and an application of the silver catalyst. With adopting the silver catalyst in preparation of ethylene oxide by the ethylene epoxidation reaction, the improved selectivity is provided.

Description

technical field [0001] The present invention relates to an alumina support for a silver catalyst used in the oxidation of ethylene to produce ethylene oxide, a preparation method thereof and a silver catalyst prepared from the support, and also relates to the use of the catalyst in the production of ethylene oxide by the oxidation of ethylene use. Background technique [0002] Alkenes can be directly oxidized to the corresponding alkene epoxides by using molecular oxygen as the oxidizing agent. The oxidation reaction uses silver as a catalyst deposited on an inert support, usually a porous solid such as alpha-alumina, on which other components are usually deposited as auxiliaries. [0003] The direct oxidation reaction of ethylene and oxygen on metallic silver to generate ethylene oxide is an important catalytic reaction process. In the process of ethylene oxide production of ethylene oxide, the use of silver catalysts with high activity, high selectivity and good stabilit...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J32/00B01J23/02B01J35/10B01J23/68C07D303/04C07D301/10
CPCB01J23/688B01J37/06B01J21/04B01J35/002B01J35/1042B01J35/1009B01J37/0201C07D301/10B01J37/0018B01J37/084B01J35/1038B01J35/026Y02P20/52B01J35/30B01J35/50B01J35/612B01J35/635B01J35/633
Inventor 陈建设蒋军王淑娟张志祥李金兵
Owner CHINA PETROLEUM & CHEM CORP
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