Doublet aperture distribution alumina carrier and its preparation method
A technology of alumina support and pore size distribution, which is applied in the direction of catalyst support, chemical instruments and methods, chemical/physical processes, etc., can solve the problem that the ratio table and pore size distribution do not meet the catalyst requirements, the catalyst active component Pd has low dispersion, and the catalyst Problems such as high surface acidity, to achieve the effect of low surface acidity, less green oil generation, and improved service life
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Embodiment 1
[0034] With stirring, containing NaAlO 2 The solution was neutralized with NaOH solution at 50°C, the hydroxide co-precipitated, stirred for 10 hours to make the hydroxide form uniform fine particles, filtered and washed with distilled water to remove Na + and Cl - ions, adding 7.65% citric acid as a pore-expanding agent, kneading and extruding to make a Φ4mm strip, drying at 120°C for 4 hours and then calcining at 1200°C for 5 hours to obtain an alumina macroporous carrier. Among them, the bulk density is 0.92g / ml, the pore volume is 0.432ml / g, and the specific surface area is 22.4m 2 / g, the carrier has a bimodal distribution at 120nm and 450nm, and the average pore size is 190nm. The pore size distribution of the carrier is as follows: 1% for less than 10nm; 73.30% for 10-200nm; 25.5% for pore size greater than 200nm but less than or equal to 1000nm; 0.2% for pore size greater than 1000nm.
[0035] Take 10ml of palladium-ion-containing palladium nitrate solution with a c...
Embodiment 2
[0037] 850g of alumina, 20g of citric acid and 30g of carbon black were stirred in a mechanical stirrer, extruded into strips of Φ4.2mm, dried at 110°C for 5 hours, and then calcined at 1250°C for 4 hours to obtain an alumina carrier. The pore volume is 0.389ml / g, the bulk density is 0.97g / ml, and the specific surface area is 13.1m 2 / g; the carrier has a bimodal distribution at 155nm and 570nm, and the average pore size is 260nm; the carrier pore size distribution is as follows: 0% for less than 10nm; 73.16% for 10-200nm; 26.66% for pore size greater than 200nm but less than or equal to 1000nm; pore size greater than 1000nm was 0.18%.
[0038] Take 10ml palladium ions containing palladium nitrate solution with a concentration of 0.042g / ml and 990ml water, mix well, impregnate 1000g carrier, dry at 150°C for 4 hours, and roast at 450°C for 5 hours to obtain an impregnated catalyst. Take 10ml of silver nitrate solution containing silver ion concentration of 0.11g / ml, add 990ml...
Embodiment 3
[0045] Under stirring, containing 1000g NaAlO 2 The solution was neutralized with KOH solution at 50°C, the aluminum-titanium hydroxide co-precipitated, stirred for 10 hours to make the aluminum-titanium hydroxide form uniform fine particles, and the product was filtered and washed with deionized distilled water to remove Na + and Cl - ions, adding 15% polyvinyl alcohol as a pore-expanding agent, rolling the ball after kneading, drying at 130°C for 2h and then roasting at 1350°C for 6 hours to obtain α-Al 2 O 3 The carrier has a bulk density of 1.05g / ml, a pore volume of 0.307ml / g, and a specific surface area of 6.5m 2 / g, the carrier has a bimodal distribution at 175nm and 580nm, and the average pore size is 280nm. The pore size distribution of the carrier is as follows: 0% for less than 10nm; 68.50% for 10-200nm; 31.36% for pore size greater than 200nm but less than or equal to 1000nm; 0.14% for pore size greater than 1000nm.
[0046] Take 1000g of carrier, add 10ml of...
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