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

Active Publication Date: 2012-10-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The existing means of producing concentrated Fischer-Tropsch synthesis hydrocarbon product distribution is generally obtained by using the space limitation of the carrier pore size, which often leads to poor catalyst stability, increased side reactions and higher catalyst costs

Method used

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Examples

Experimental program
Comparison scheme
Effect test

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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Abstract

The invention discloses a Fischer-Tropsch synthesis cobalt-based catalyst using modified silica gel as a carrier. In the catalyst, the silicon gel is used as the carrier, cobalt is used as an active component, two assistants are contained simultaneously, wherein the first assistant is boron, and the second assistant is selected from one or more components of Re, Zr, Hf, Ce, La, Th, Ru, Pt and Pd.The preparation method of the catalyst comprises the following steps of: firstly modifying the silica gel carrier by using a boron-containing alkaline solution, and then loading the second assistant and the active component Co by adopting an infusion method. Compared with the prior art, the Fischer-Tropsch synthesis cobalt-based catalyst has the advantage of high Fischer-Tropsch reactivity, and because the carbon number of the product is distributed between C1 and C30, the catalyst has high distillation selectivity between C1 and C30.

Description

Technical field [0001] The invention relates to a Fischer-Tropsch synthesis cobalt-based catalyst with silica gel as a carrier and a preparation method thereof, in particular to a cobalt-based Fischer-Tropsch synthesis catalyst with a modified silica gel as a carrier and a preparation method thereof. Background technique [0002] In the 21st century, both developed and developing countries are still facing the challenge of seeking new alternative energy sources. Especially in recent years, in order to meet the needs of the sustainable development of the global economy and energy security, many large energy companies have invested heavily in the development of alternative energy sources. Among them, Fischer-Tropsch synthesis technology (Fischer-Tropsch synthesis) is an important way to transform coal and natural gas into liquid fuels or high value-added chemical products. Cobalt in the active components of known Fischer-Tropsch synthesis catalysts has good activity, and because o...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75B01J23/889B01J23/83B01J23/89B01J21/02B01J37/00B01J37/02C10G2/00
Inventor 张舒冬张喜文李杰倪向前陈楠
Owner CHINA PETROLEUM & CHEM CORP
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