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Preparation method for silver catalyst, and silver catalyst and application thereof

A technology of silver catalysts and additives, applied in chemical instruments and methods, physical/chemical process catalysts, organic compound/hydride/coordination complex catalysts, etc., to achieve the effect of improving activity and selectivity and improving performance

Active Publication Date: 2016-02-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The purpose of this invention is to provide a kind of preparation method of the silver catalyst of the silver catalyst that is used for ethylene epoxidation to produce oxirane, all higher silver catalysts to produce selectivity and activity, to solve existing in the prior art question

Method used

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  • Preparation method for silver catalyst, and silver catalyst and application thereof
  • Preparation method for silver catalyst, and silver catalyst and application thereof
  • Preparation method for silver catalyst, and silver catalyst and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Embodiment 1: the preparation of carrier

[0054] Mix 50~500mesh trihydrate α-A1 2 o 3 4800g, fake monohydrate A1 passed through 200 mesh sieve 2 o 3 1200g, NH 4 F150g, 54g of magnesium nitrate and 21g of barium sulfate are put into the mixer and mixed evenly, then transferred to the kneader, add 42g of petroleum jelly and 2100ml of dilute nitric acid (nitric acid: water = 1:3, weight ratio), and knead to make it extrudable of paste. Extrude into a five-hole column with an outer diameter of 8.0mm, a length of 6.0mm, and an inner diameter of 1.0mm, and dry it at 80-120°C for more than 2 hours to reduce the free water content to below 10%. Put the kneaded carrier into a bell kiln, raise it from room temperature to 1280° C. over 33 hours, and calcinate at 1280° C. for 10 hours to obtain a white carrier.

Embodiment 2

[0056] 8.70g ethylenediamine and 2.94g ethanolamine are dissolved in 18.06g deionized water, and silver oxalate is slowly added in the mixed solution under stirring, and the add-on of silver oxalate makes the silver content be 26% (by weight) count). After the silver amine solution is prepared, 0.068g of cesium sulfate and 0.034g of methyl rhenium trioxide are added to prepare the impregnating solution. Take 15g of the carrier sample and put it into a flask. After vacuuming, introduce the impregnation solution to soak the carrier, and then leaching and thermal decomposition at 300°C for 3 minutes to obtain the finished silver catalyst.

Embodiment 3

[0058] Dissolve 0.034g of methyl rhenium trioxide in 50g of deionized water as impregnating solution 1; then dissolve 8.70g of ethylenediamine and 2.94g of ethanolamine in 18.06g of deionized water, and slowly add silver oxalate into the mixture while stirring, The silver oxalate is added in such an amount that the silver content in the final dipping solution is 26% (by weight). After the preparation of the silver amine solution is completed, 0.068 g of cesium sulfate is added to prepare the second dipping solution. Take 15g of the carrier sample and put it into a flask. After vacuuming, introduce impregnating solution 1 to soak the carrier. After leaching and drying at 120°C for 30 minutes, soak the carrier loaded with rhenium additives with immersion solution 2, and then leaching and 300°C. After thermal decomposition at ℃ for 3 minutes, the finished silver catalyst was obtained. The content of silver in the silver catalyst is 18±1wt%, the content of alkali metal promoter i...

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Abstract

The invention relates to a preparation method for a silver catalyst used for production of oxirane through epoxidation of ethylene and also relates to the silver catalyst prepared by using the method and application thereof. The method comprises the following steps: providing a carrier; impregnating the carrier with an organic rhenium-containing auxiliary agent so as to obtain a first impregnation product; leaching and drying the first impregnation product and then impregnating the leached and dried first impregnation product with a silver amine containing an alkali metal auxiliary agent so as to obtain a second impregnation product; and subjecting the second impregnation product to thermal decomposition in an air current or a nitrogen oxygen mixture with oxygen content of no more than 21% so as to obtain the silver catalyst. The auxiliary agents used in the method comprise the alkali metal auxiliary agent and the organic rhenium-containing auxiliary agent. The performance of the silver catalyst can be improved by using an organic rhenium-containing precursor and adoption of an auxiliary agent addition manner of secondary impregnation.

Description

technical field [0001] The invention relates to a preparation method of a silver catalyst used for epoxidation of ethylene to produce ethylene oxide, in particular to a preparation method of a high-selectivity silver catalyst and a medium-selectivity silver catalyst. The present invention also relates to the silver catalyst prepared by this method, and its application. Background technique [0002] Silver catalysts are industrially used in the epoxidation of ethylene to produce ethylene oxide (EO). Since the first publication of the direct oxidation of ethylene to EO in 1931, there have been more than 80 years of research history. There has been a long-standing desire to obtain highly active and selective silver catalysts for the production of ethylene oxide from ethylene. [0003] Silver catalysts commonly used in industrial EO / EG production units are divided into the following three types: one is high-activity silver catalysts, which have high activity and good stability...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J31/02C07D303/04C07D301/10
CPCY02P20/52
Inventor 任冬梅陈建设李贤丰李金兵孙欣欣王淑娟
Owner CHINA PETROLEUM & CHEM CORP
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