Cobalt-based catalyst, and preparation method and application thereof, and Fischer-Tropsch synthesis method
A technology of cobalt-based catalysts and Fischer-Tropsch synthesis, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxides/metal hydroxide catalysts, etc., can solve the problems that the catalyst activity needs to be further improved, and achieve Effects of low methane selectivity, high CO conversion, and high C5+ selectivity
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[0018] According to another aspect of the present invention, the present invention also provides a method for preparing a cobalt-based catalyst, comprising the steps of:
[0019] 1) impregnating the carrier with a solution containing a cobalt compound, and then sequentially drying the impregnated carrier, roasting or not roasting, and reducing activation;
[0020] 2) Under a reducing or inert atmosphere, the product obtained in step (1) is impregnated with a solution containing high-boiling organic matter and then heat-treated to obtain the cobalt-based catalyst.
[0021] According to the present invention, the cobalt-containing compound is preferably selected from at least one of cobalt nitrate, acetate, sulfate, basic carbonate, and chloride; the solution concentration in terms of cobalt element is preferably 50-1000 grams / L, more preferably 100-700 g / L.
[0022] The present invention is not particularly limited to the impregnation method and conditions in steps (1) and (2...
Embodiment 1
[0041] (1) Catalyst preparation and characterization
[0042] According to the required metal salt content of equal-volume impregnation method, 36.1 milliliters of cobalt nitrate containing 208 grams per liter of cobalt and 1.38 grams per liter of platinum and the impregnation solution of platinum dichlorotetraammine were prepared. Decant the impregnation solution to 42.5 g SiO 2 Carrier (Fuji Silicon Co., Ltd., Japan, average particle size 40-80 microns, specific surface area 135m 2 / g), stirred evenly at 20°C and allowed to stand for 4 hours, then dried at 120°C, calcined at 400°C for 4 hours, reduced with hydrogen at 400°C for 4 hours, and the hydrogen pressure was 0.1 MPa. After reduction, it was lowered to room temperature, and 36.1 ml of 14.5 g / L sucrose aqueous solution was added under a hydrogen atmosphere. After standing for 2 hours, it was dried at 120°C and then heated at 500°C for dehydration and carbonization. After cooling down to room temperature, the O 2 / N ...
Embodiment 2
[0064] (1) Catalyst preparation and characterization
[0065] According to the required metal salt content of equal-volume impregnation method, 36.1 milliliters of cobalt nitrate containing 208 grams per liter of cobalt and 1.38 grams per liter of platinum and the impregnation solution of platinum dichlorotetraammine were prepared. Decant the impregnation solution to 42.5 g SiO 2 Carrier (Qingdao Ocean Chemical Plant, average particle size 40-80 microns, specific surface area 148m 2 / g), stirred evenly at 20°C and allowed to stand for 4 hours, then dried at 120°C, calcined at 400°C for 4 hours, reduced with hydrogen at 400°C for 4 hours, and the hydrogen pressure was 0.1 MPa. After reduction, it was lowered to room temperature, and 36.1 ml of 15.3 g / L glucose aqueous solution was added under a hydrogen atmosphere, and after standing for 2 hours, it was dried at 120°C and then heated at 500°C for dehydration and carbonization. After cooling down to room temperature, the O 2 ...
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