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Preparation method of Co based Fischer-Tropsch synthesis catalyst

A Tropsch synthesis and catalyst technology, which is applied in the field of preparation of high-activity cobalt-based Fischer-Tropsch synthesis catalysts, can solve the problems of lower optimal activity temperature, low active phase, and high reaction temperature, and achieves accelerated aggregation or oxidation, which is beneficial to The effect of mature industrial production and process technology

Active Publication Date: 2012-09-12
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the activities of different catalysts prepared by the above methods are constantly improving, the reaction temperature to achieve the best activity is generally around 220°C
In industrial applications, high reaction temperature not only increases energy consumption, but also accelerates the aggregation or oxidation of the active center of the catalyst, which affects the activity and stability of the catalyst; at the same time, the catalyst is used at a higher temperature for a long time, which will also accelerate the catalytic activity of the metal. The components react with the carrier to form a low-activity phase, forming non-renewable deactivation and reducing the life of the catalyst
Although the optimal activity temperature of Fischer-Tropsch synthesis catalysts containing noble metal additives has been reduced, the cost of noble metals is high and it is not suitable for large-scale industrial use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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. ...

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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 、...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J37/02B01J23/889B01J23/83C10G2/00
Inventor 李杰张舒冬陈楠倪向前张喜文
Owner CHINA PETROLEUM & CHEM CORP
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