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Fischer-Tropsch synthesis cobalt-based catalyst using modified silica gel as carrier and preparation method thereof

A Fischer-Tropsch synthesis and catalyst technology, applied in catalyst activation/preparation, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc., can solve problems such as poor catalyst stability, increased side reactions, and increased catalyst cost, and achieve product selectivity Improve the effect of simple preparation method and high Fischer-Tropsch reactivity

Active Publication Date: 2010-12-22
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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  • Fischer-Tropsch synthesis cobalt-based catalyst using modified silica gel as carrier and preparation method thereof

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] The preparation concentration is 39.77gB 2 o 3 / l solution of boric acid. Under constant temperature conditions of 30°C, 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 to 500ml, and the pH of the final solution is 8.7, and its composition is B 2 o 3 39.77g / l (press B 2 o 3 The mass percentage of meter is 4%), NH 3 3g / l. The solution was placed in a closed system at room temperature for 24 hours without significant change.

[0020] Boron-containing alkaline solution B

[0021] 30 ml of ammonia solution with a concentration of 2.94 mol / l was added to the boron-containing alkaline solution A, and ethanolamine was added at the same time. The ethanolamine content of the final solution was 1.5 g / l, and the pH ...

Embodiment 2

[0025] Commercially available silica gel (pore volume is 1.06ml / g, specific surface area is 386.81m 2 / g, 40-60 mesh) placed in 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 lower than 500μg / g. The above silica gel was dried at 80°C for 8 hours, and baked at 350°C for 4 hours. Weigh 100 g of the above-mentioned calcined silica gel, add deionized water dropwise until initial moistening, and the volume of consumed water is 160 ml. 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, soak at 20°C for 10 hours, and dry at 80°C for 8 hours, 350°C ℃ for 4 hours, and the boron element in the final catalyst accounted for 2% by weight of the silica gel carrier. According to the weight ratio of zirconium element in the final catalyst to the silica gel carrier of 3%, 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. Baking at 350° C. for 4 hours. Based on the cobalt element in the final catalyst accounting for 15% by weight of the silica gel carrier, weigh 14.81 g of cobalt nitrate hexahydrate and dissolve it in 32 ml of deionized water, add it to the above-mentioned sample impregnated with zirconium, age for 4 hours, and dry at 80 ° C for 8 hours. Baking at 35...

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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 cobalt-based Fischer-Tropsch synthesis catalyst with silica gel as a carrier and a preparation method thereof, in particular to a cobalt-based Fischer-Tropsch synthesis catalyst with 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 finding new alternative energy sources. Especially in recent years, in order to meet the needs of global economic sustainable development and energy security, many large energy companies have invested heavily in the development of alternative energy. Among them, Fischer-Tropsch synthesis technology (Fischer-Tropsch synthesis) is an important way to convert 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 of its advantages ...

Claims

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Application Information

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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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