A kind of highly dispersed catalytic system and its preparation method and application
A catalytic system, high dispersion technology, applied in chemical instruments and methods, hydrogenation to hydrocarbons, bulk chemical production, etc., can solve the problems of easy blockage of gas distribution pores, uneven dispersion, low hydrogenation activity, etc., to avoid acetylene The effect of deep hydrogenation, less dosage, and improved ethylene yield
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Embodiment 1
[0031] Specific steps are as follows:
[0032] 1) Mole ratio n (Pd) :n (Ag) =1:2.5 Get catalyst precursor palladium chloride 0.336g, cocatalyst silver nitrate to be dissolved in 2g water, obtain aqueous solution;
[0033] 2) Dissolve the surfactant fatty alcohol polyoxyethylene ether in the organic solution N-methyl-2-pyrrolidone, mix uniformly to prepare 400 g of the dispersed phase, and the concentration of the surfactant is 500 μg·g -1 ;
[0034] Raise the temperature of the dispersed phase to 80°C, and slowly add the aqueous solution into the dispersed phase under vigorous stirring;
[0035] 3) Continue to slowly raise the temperature of the mixed solution to 120°C, pass nitrogen gas for 60 minutes, and remove the water in the mixed solution by air stripping;
[0036] 4) Continue to raise the temperature to 160°C, pass in hydrogen, and the space velocity is 1s -1 , and reduced for 5 hours to obtain the catalytic system 1, the average particle size of the particles in ...
Embodiment 2
[0038] Specific steps are as follows:
[0039] 1) Take a certain amount of co-solvent nitric acid and disperse in water to obtain a total of 6g, by molar ratio n (Pd) :n (Ag) =1:1 get catalyst precursor palladium nitrate 24.3g, promoter silver nitrate and dissolve in water, prepare aqueous solution;
[0040] 2) Dissolve surfactant cetylbenzenesulfonate, ionic liquid [BMIM][BF4] 3g in organic solution dimethylformamide, mix evenly and be made into dispersed phase 100g; Wherein, surfactant concentration is 300μg·g -1 ;
[0041] Raise the temperature of the dispersed phase to 80°C, atomize and disperse the aqueous solution into the dispersed phase;
[0042] 3) Continue to slowly raise the temperature of the mixed solution to 180°C, pass nitrogen gas for 10 minutes, and remove the water in the mixed solution by air stripping;
[0043] 4) Continue to raise the temperature to 200°C, inject hydrogen with a space velocity of 0.1s -1 , and reduced for 1 h to obtain the catalytic ...
Embodiment 3
[0045] Proceed as follows:
[0046] 1) Use acetic acid as a co-solvent, configure an acetic acid solution with pH=3, by molar ratio n (Pd) :n (Ag) =1:3 get catalyst precursor palladium acetate 3.36g, cocatalyst silver nitrate and dissolve in the acetic acid aqueous solution of 3g, be mixed with aqueous solution;
[0047] 2) Surfactant alkyl sulfonate, ionic liquid [BMIM] [BF4 ]3g was dissolved in the organic solution dimethylformamide, uniformly mixed to form 900g of the dispersed phase, wherein the surfactant concentration was 300μg·g -1 ;
[0048] Raise the temperature of the dispersed phase to 80°C, slowly add the aqueous solution into the dispersed phase under ultrasonic vibration and stirring;
[0049] 3) Continue to slowly raise the temperature of the mixed solution to 150° C., pass nitrogen gas for 30 minutes, and remove moisture by air stripping;
[0050] 4) Continue to raise the temperature to 180°C, inject hydrogen with a space velocity of 0.5s -1 , reduced for ...
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