Silver catalyst for producing ethylene oxide by ethylene epoxidation and its preparation method and application
An ethylene epoxidation, silver catalyst technology, applied in metal/metal oxide/metal hydroxide catalyst, physical/chemical process catalyst, bulk chemical production, etc., can solve the problem of uneven particle size distribution of active components, etc. problems, to achieve high catalytic activity and selectivity, improved stability, and uniform distribution.
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Embodiment 1
[0057] Dissolve 200g of pyridine and 1000g of 1,4-butanediamine in 1500g of deionized water, slowly add silver oxalate to the mixture under stirring, and keep the temperature below 30°C. Contains 24% silver by weight. After the silver amine solution is prepared, keep the existing temperature, add 15.0g of cesium sulfate, 2.8g of calcium nitrate, 1.4g of ammonium perrhenate and 0.5g of cerium sulfate, then add 200g of citric acid, and finally add deionized Water makes the total mass of the solution reach 5000g, and is prepared into an impregnating solution for use.
[0058] Take 2500g of carrier sample and put it into a container, vacuumize to a degree of vacuum lower than 10mmHg, put the above impregnating liquid into it, immerse the carrier, keep it for 30 minutes, and then remove the excess impregnating liquid by leaching. The above-mentioned solid was dried at 100°C for 8 hours, heated in an air flow at 400°C for 20 minutes, and cooled to prepare a silver catalyst for ethy...
Embodiment 2
[0060] Dissolve 500g of ethylenediamine and 800g of 1,3-propanediamine in 1500g of deionized water, slowly add silver nitrate to the mixture under stirring, and keep the temperature below 30°C. The immersion solution contains 20% silver by weight. After the silver amine solution is prepared, keep the existing temperature, add 5.0g of cesium sulfate, 12.8g of barium acetate, 5.4g of perrhenic acid and 2.0g of cerium sulfate, then add 50g of acetic acid, and finally add deionized water to make the solution. The total mass of the solution reaches 5000g, which is prepared into an impregnating liquid and is ready for use.
[0061] Take 2500g of the carrier sample and put it into the container, vacuumize until the vacuum degree is lower than 10mmHg, put the above dipping solution into it, immerse the carrier, keep it for 60 minutes, and then remove the excess dipping solution by leaching. The above-mentioned solid was dried at 150°C for 3 hours, heated in an air flow of 500°C for 1...
Embodiment 3
[0063] Dissolve 500g of ethylenediamine and 800g of 1,3-propanediamine in 1500g of deionized water, slowly add silver nitrate to the mixture under stirring, and keep the temperature below 30°C. The immersion solution contains 20% silver by weight. After the silver amine solution is prepared, keep the existing temperature, add 5.0g of cesium sulfate, 12.8g of barium acetate, 5.4g of perrhenic acid and 2.0g of cerium sulfate, then add 600g of malic acid, and finally add deionized water. Make the total mass of the solution reach 5000g, prepare the dipping solution, and stand by.
[0064] Take 2500g of carrier sample and put it into the container, vacuum to the degree of vacuum lower than 10mmHg, put the above impregnating liquid into it, immerse the carrier, keep it for 90 minutes and then remove the excess impregnating liquid by leaching. The above-mentioned solid was dried at 60°C for 24 hours, heated in an air flow at 200°C for 60 minutes, and cooled to prepare a silver catal...
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