A kind of C2 pre-hydrogenation catalyst containing composite carrier and preparation method thereof
A composite carrier and catalyst technology, which is applied in the direction of hydrogenation hydrocarbon production, chemical instruments and methods, physical/chemical process catalysts, etc., can solve the problem of low dispersion of catalyst active component Pd, specific surface and pore size distribution not suitable for catalyst requirements, catalyst The problem of high surface acidity can improve the ability of anti-heavy metal poisoning, the surface acidity is low, and the effect of avoiding the reduction of activity is achieved.
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Embodiment 1
[0046] Under stirring, containing 1286g NaAlO 2 solution and containing 950g of TiCl 4 The solution was mixed at 50°C, then neutralized with NaOH solution, aluminum-titanium hydroxide co-precipitated, stirred for 10 hours to make the aluminum-titanium 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, extruding after kneading to make a Φ4mm strip, drying at 120°C for 4 hours and then roasting at 1250°C for 5 hours to obtain the composite carrier S-1 of alumina and titania, where α -Al 2 o 3 and TiO 2 The weight ratio is 8:2, the bulk density is 0.87g / ml, the pore volume is 0.502ml / g, and the specific surface area is 18.9m 2 / g (mercury intrusion method), the carrier has a bimodal distribution at 90nm and 410nm, and the average pore size is 176nm. The carrier pore size distribution is as follows: less than 10nm is 0.19%; 10-100nm is 71.11%; greater than 100nm but...
Embodiment 2
[0048] 700g of alumina, 150g of titanium oxide, 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 Aluminum oxide and titanium oxide mixed carrier, pore volume 0.419ml / g, bulk density 0.92g / ml, specific surface area 14.5m 2 / g; the carrier has a bimodal distribution at 110nm and 520nm, and the average pore size is 273nm; the carrier pore size distribution is as follows: 0.10% for less than 10nm; 63.06% for 10-100nm; 36.66% for greater than 100nm and less than or equal to 1000nm; 0.18% for greater than 1000nm . The carrier pore size distribution diagram is detailed in figure 2 .
Embodiment 3
[0050] Under stirring, containing 402g NaAlO 2 solution and containing 1187g of TiCl 4 The solution was mixed at 50°C, then neutralized with KOH solution, 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 calcining at 1350°C for 6 hours to obtain a composite carrier of alumina and titania, in which α-Al 2 o 3 and TiO 2 The weight ratio is 5:5, the bulk density is 1.03g / ml, the pore volume is 0.357ml / g, and the specific surface area is 7.5m 2 / g, the carrier has a bimodal distribution at 125nm and 760nm, and the average pore size is 360nm. The carrier pore size distribution is as follows: less than 10nm is 0%; 10-100nm is 58.50%; greater than 100nm and less than or equal ...
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