Fischer-Tropsch synthesis cobalt-based catalyst using modified silica gel as carrier and preparation method thereof
A technology of cobalt-based catalyst and Fischer-Tropsch synthesis, which is applied in the direction of catalyst activation/preparation, chemical instruments and methods, and preparation of liquid hydrocarbon mixtures. It can solve the problems of poor catalyst stability, increased side reactions, and increased catalyst cost. Effects of increased selectivity, simple preparation method, and high Fischer-Tropsch reactivity
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Embodiment 1
[0017] Example 1 Preparation of boron-containing alkaline solution.
[0018] Boron-containing alkaline solution A
[0019] Preparation concentration is 39.77gB 2 O 3 / l solution of boric acid. At a constant temperature of 30℃, take 400g of deionized water, add 30ml of ammonia solution with a concentration of 2.94mol / l, then add 35.13g of boric acid, add deionized water to a 500ml volumetric flask to make the volume up to 500ml, the pH of the final solution 8.7, its composition is B 2 O 3 39.77g / l (press B 2 O 3 The total mass percentage is 4%), NH 3 3g / l. The solution was placed in a closed system at room temperature for 24 hours without significant changes.
[0020] Boron-containing alkaline solution B
[0021] To the boron-containing alkaline solution A, 30 ml of an ammonia solution with a concentration of 2.94 mol / l was added at the same time ethanolamine was added, and the ethanolamine content of the final solution was 1.5 g / l and the pH value was 9.5.
[0022] Boron-containing...
Embodiment 2
[0025] The commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g, 40-60 mesh) placed in a 1mol / l ammonium nitrate solution, stirred for 24h, and then fully washed with deionized water at room temperature until the sodium content in the silica gel was less than 500μg / g. The above silica gel was dried at 80°C for 8 hours and calcined at 350°C for 4 hours. Weigh 100g of the above-mentioned roasted silica gel, add deionized water dropwise to the initial moisture, and the volume of water consumed is 160ml. The following examples all use the silica gel treated by the above method.
Embodiment 3
[0027] Take 32ml of the boron-containing alkaline solution A prepared in Example 1, add it to 20g of the silica gel described in Example 2 at room temperature, stir until uniform, immerse at 20°C for 10 hours, and dry at 80°C for 8 hours. After calcination at C for 4 hours, the boron element in the final catalyst accounts for 2% by weight of the silica gel carrier. According to the weight ratio of zirconium in the final catalyst to 3% of the silica gel carrier, weigh 2.94g of zirconium nitrate hexahydrate and dissolve it in 32ml of deionized water, add it to the modified carrier silica gel, age for 4 hours, and dry at 80°C for 8 hours. Calcined at 350°C for 4 hours. Based on the 15% weight ratio of cobalt element in the final catalyst to the silica gel carrier, weigh 14.81g cobalt nitrate hexahydrate, dissolve it in 32ml deionized water, add it to the sample impregnated with zirconium, age for 4 hours, and dry at 80°C for 8 hours. Calcined at 350°C for 4 hours. The obtained c...
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