Preparation method of Co based Fischer-Tropsch synthesis catalyst

Abstract

The invention relates to a preparation method of a Co based Fischer-Tropsch synthesis catalyst, which comprises the following steps of: firstly carrying out surface modification on a carrier made of silica gel; and then loading metallic aids and an active component Co by a immersion method, wherein in the surface modification method of the silicon gel, immersion treatment with a buffer solution containing ammonium salt is adopted. When reaching the same synthesis gas conversion rate, the Fischer-Tropsch synthesis catalyst prepared by the method requires obviously lower reaction temperature compared with the traditional catalyst, thereby effectively prolonging the service life of the catalyst.

Description

technical field

[0001] The invention relates to a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst, in particular to a preparation method of a high-activity cobalt-based Fischer-Tropsch synthesis catalyst modified with modified silica gel and added with metal additives. Background technique

[0002] Fischer-Tropsch synthesis refers to synthesis gas (CO+H 2 ) Catalyze the reaction of synthesizing hydrocarbon liquid fuel on the catalyst. With the increasing depletion of petroleum resources, the preparation of liquid fuels by Fischer-Tropsch synthesis has attracted more and more attention from all over the world. Catalyst is one of the key technologies of Fischer-Tropsch synthesis reaction. In the research of Fischer-Tropsch catalysts in the past 80 years, it has been found that Fe, Co and Ru are effective active components of Fischer-Tropsch catalysts. Activity and stability play an important role, and the carrier of the catalyst is amorphous SiO 2 、...

Examples

example 1

[0016] Weigh commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g, the following examples all use the silica gel) 30g, distilled water is added dropwise to initial moistening, the volume of consumed water is 48ml, 48ml concentration is 5% ammonium carbonate solution, add in silica gel at 50 ℃, process 10 hours. Dry at 60°C for 24 hours, then bake at 280°C for 15 hours. Based on the final catalyst zirconium content of 3 wt%, zirconium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml, add it to the sample impregnated with zirconium, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst was designated as C-1.

[0017] Catalyst evaluation test In a high-pressure cont...

example 2

[0019] Weigh 30g of commercially available silica gel, add distilled water dropwise until initial moistening, the volume of consumed water is 48ml, add 48ml of 15% ammonium carbonate solution to the silica gel at 80°C, and stir. Treat for 30 hours and dry at 90°C for 16 hours. Based on the final catalyst zirconium content of 3 wt%, zirconium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml, add it to the sample impregnated with zirconium, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated CFT-2. The experimental conditions for catalyst activity evaluation are the same as in Example 1. The results of the Fischer-Tropsch synthesis reaction over the C-2 catalyst are shown in Table 1.

example 3

[0021] Weigh 30g of commercially available silica gel, add distilled water dropwise until initial moistening, the volume of consumed water is 48ml, add 48ml of ammonium carbonate solution with a concentration of 20% to the silica gel at 95°C, stir for 100 hours, and dry at 100°C for 8 hours . Based on the final catalyst zirconium content of 3 wt%, zirconium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml, add it to the sample impregnated with zirconium, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated CFT-3. The experimental conditions for catalyst activity evaluation are the same as in Example 1. Table 1 shows the results of the Fischer-Tropsch synthesis reaction over the C-3 catalyst. ...

technical field

[0001] The invention relates to a preparation method of a cobalt-based Fischer-Tropsch synthesis catalyst, in particular to a preparation method of a high-activity cobalt-based Fischer-Tropsch synthesis catalyst modified with modified silica gel and added with metal additives. Background technique

[0002] Fischer-Tropsch synthesis refers to synthesis gas (CO+H 2 ) Catalyze the reaction of synthesizing hydrocarbon liquid fuel on the catalyst. With the increasing depletion of petroleum resources, the preparation of liquid fuels by Fischer-Tropsch synthesis has attracted more and more attention from all over the world. Catalyst is one of the key technologies of Fischer-Tropsch synthesis reaction. In the research of Fischer-Tropsch catalysts in the past 80 years, it has been found that Fe, Co and Ru are effective active components of Fischer-Tropsch catalysts. Activity and stability play an important role, and the carrier of the catalyst is amorphous SiO 2 、...

Examples

example 1

[0016] Weigh commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g, the following examples all use the silica gel) 30g, distilled water is added dropwise to initial moistening, the volume of consumed water is 48ml, 48ml concentration is 5% ammonium carbonate solution, add in silica gel at 50 ℃, process 10 hours. Dry at 60°C for 24 hours, then bake at 280°C for 15 hours. Based on the final catalyst zirconium content of 3 wt%, zirconium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml, add it to the sample impregnated with zirconium, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst was designated as C-1.

[0017] Catalyst evaluation test In a high-pressure cont...

example 2

[0019] Weigh 30g of commercially available silica gel, add distilled water dropwise until initial moistening, the volume of consumed water is 48ml, add 48ml of 15% ammonium carbonate solution to the silica gel at 80°C, and stir. Treat for 30 hours and dry at 90°C for 16 hours. Based on the final catalyst zirconium content of 3 wt%, zirconium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml, add it to the sample impregnated with zirconium, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated CFT-2. The experimental conditions for catalyst activity evaluation are the same as in Example 1. The results of the Fischer-Tropsch synthesis reaction over the C-2 catalyst are shown in Table 1.

example 3

[0021] Weigh 30g of commercially available silica gel, add distilled water dropwise until initial moistening, the volume of consumed water is 48ml, add 48ml of ammonium carbonate solution with a concentration of 20% to the silica gel at 95°C, stir for 100 hours, and dry at 100°C for 8 hours . Based on the final catalyst zirconium content of 3 wt%, zirconium nitrate was weighed and dissolved in 48ml, added to the modified carrier silica gel for impregnation, aged for 3 hours, dried at 80°C for 8 hours, and calcined at 350°C for 4 hours. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml, add it to the sample impregnated with zirconium, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated CFT-3. The experimental conditions for catalyst activity evaluation are the same as in Example 1. Table 1 shows the results of the Fischer-Tropsch synthesis reaction over the C-3 catalyst. ...