A Method for Regulating the Spatial Distribution of Metal Active Components in Industrial Eggshell Catalysts
A catalyst and silica technology, applied in chemical instruments and methods, catalyst activation/preparation, catalyst regeneration/reactivation, etc., can solve the problems of high preparation cost and low catalytic efficiency, and achieve the effect of simple preparation
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Embodiment 1
[0033] Preparation of the carrier: uniformly mix 300g of silica powder and 700g of silica sol, fill them into an extruder, and the extruder uses a 3mm circular die. Dry the extrudate in an oven at 100°C for 4 hours, then put it into a muffle furnace for roasting, rise to room temperature at 2°C / min to 120°C, keep it for 2 hours, then raise the temperature to 500°C at 2°C / min, keep 6h, take out the carrier after naturally cooling down to room temperature, and name it as SiO 2 -A. The solid content of the silica sol is 35%.
[0034] Catalyst preparation: Cobalt nitrate solution was prepared with deionized water, and its concentration was 6 mol / L. Spread the carrier flat in the sand core funnel, connect the sand core funnel to a vacuum pump, pour the cobalt nitrate solution into the funnel, turn on the vacuum pump after 2 seconds, and pump out the excess precursor solution. Immediately put the impregnated catalyst into an oven at 100°C to dry for 4 hours, then transfer to a mu...
Embodiment 2
[0038] Preparation of the carrier: uniformly mix 300g of silica powder and 150g of silica sol, fill them into an extruder, and the extruder uses a 3mm circular die. Dry the extrudate in an oven at 100°C for 4 hours, then put it into a muffle furnace for roasting, rise to room temperature at 2°C / min to 120°C, keep it for 2 hours, then raise the temperature to 500°C at 2°C / min, keep 6h, take out the carrier after naturally cooling down to room temperature, and name it as SiO 2 -B. The solid content of the silica sol is 40%.
[0039]Catalyst preparation: Cobalt nitrate solution was prepared with deionized water, and its concentration was 6 mol / L. Spread the carrier flat in the sand core funnel, connect the sand core funnel to a vacuum pump, pour the cobalt nitrate solution into the funnel, turn on the vacuum pump after 3 seconds, and pump out the excess precursor solution. Immediately put the impregnated catalyst into an oven at 100°C to dry for 4 hours, then transfer to a muf...
Embodiment 3
[0044] Use the prepared carrier SiO of embodiment 1 2 -A prepare catalyst: configure cobalt nitrate solution with deionized water, its concentration is 6mol / L. Spread the carrier flat in the sand core funnel, connect the sand core funnel to a vacuum pump, pour the cobalt nitrate solution into the funnel, turn on the vacuum pump after 15 seconds, and pump out the excess precursor solution. Immediately put the impregnated catalyst into an oven at 100°C to dry for 4 hours, then transfer to a muffle furnace, rise to room temperature at 1°C / min to 120°C, keep for 2 hours, then raise the temperature to 250°C at 1°C / min, keep After 6h, the catalyst C was taken out after it was naturally lowered to room temperature.
[0045] The optical picture of the catalyst prepared in this embodiment is shown in figure 1 As shown in C, when the impregnation time reaches 15s, the catalyst does not have an eggshell structure.
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Abstract
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