Cobalt-based catalyst for directly preparing olefin from synthesis gas, and preparation method and application thereof
A cobalt-based catalyst, synthesis gas technology, applied in carbon compound catalysts, catalysts, catalysts for physical/chemical processes, etc., can solve the problems of poor catalytic activity, low olefin selectivity, and high methane selectivity
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Embodiment 1
[0056] Fully stir and dissolve according to the molar ratio of cobalt nitrate:water=1:25 to obtain the first solution; fully stir and dissolve the molar ratio of sodium carbonate:water=1:25 to obtain the second solution. At a precipitation temperature of 80° C. and pH controlled at 7, the first solution and the second solution were dropped into deionized water with a cobalt:water mass ratio=1 at the same time. After the dropwise addition, it was crystallized at 30°C for 48 hours, centrifuged, and the obtained solid product was dried at 100°C for 4 hours, and the dried solid product was calcined at 300°C for 4 hours.
[0057] The solid obtained by roasting is impregnated in equal volume according to the mass ratio of cobalt source: sodium hydroxide = 1:0.001, dried at 60 °C for 24 hours, and the solid obtained by drying is roasted at 400 °C for 3 hours.
[0058] With 10%H 2 / Ar mixed gas is reducing gas, reduced at 300℃, 1MPa, space velocity is 4000h -1 , reduced for 5 hours,...
Embodiment 2
[0060] Fully stir and dissolve according to the molar ratio of cobalt acetate: manganese nitrate: water = 1:2:500 to obtain the first solution; fully stir and dissolve the molar ratio of ammonium carbonate: water = 1:800 to obtain the second solution. At the precipitation temperature of 0°C, the pH was controlled at 10, and the first solution and the second solution were simultaneously dropped into deionized water with a mass ratio of cobalt:water=1:10. After the dropwise addition, it was crystallized at 0°C for 72 hours, separated by filtration, dried at 60°C for 24 hours, and calcined at 200°C for 12 hours.
[0061] The solid obtained by roasting was impregnated in equal volume according to the mass ratio of cobalt source: lithium hydroxide = 1:0.01, dried at 100°C for 4 hours, and the solid obtained by drying was roasted at 300°C for 12 hours.
[0062] With 20% Syngas / N 2 The mixed gas is reducing gas, reduced at 500°C, 0.1MPa, and the space velocity is 500h -1 , reduced ...
Embodiment 3
[0064] Fully stir and dissolve according to the molar ratio of cobalt formate: ammonium vanadate: water = 1:10:1000 to obtain the first solution; fully stir and dissolve the molar ratio of sodium bicarbonate: water = 1:1000 to obtain the second solution. At a precipitation temperature of 90°C and a pH control of 12, the first solution and the second solution were dropped into deionized water with a cobalt:water mass ratio of 1:100 at the same time. After the dropwise addition, hydrothermal crystallization was carried out at 200°C for 1 hour, separated by filtration, and the obtained solid product was dried at 30°C for 48 hours, and the dried solid product was calcined at 500°C for 1 hour.
[0065] The solid obtained by roasting is impregnated in equal volume according to the mass ratio of cobalt source: sodium nitrate = 1:0.0001, dried at 160 °C for 4 hours, and the solid obtained by drying is roasted at 500 °C for 1 hour.
[0066] with H 2 It is reducing gas, reduced at 150℃...
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