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Method for preparing long-life cobalt-based catalyst for Fischer-Tropsch synthesis

A cobalt-based Fischer-Tropsch synthesis technology, which is used in catalyst activation/preparation, preparation of liquid hydrocarbon mixtures, chemical instruments and methods, etc., can solve problems such as catalyst activity reduction, and achieve deactivation inhibition, mature process technology, and simple preparation. Effect

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

[0003] However, the commonly used support for cobalt-based catalysts, SiO 2 、Al 2 o 3 、TiO 2 It is easy to make the active components form compounds that are difficult to reduce, such as CoSiO 4 、CoAl 2 o 4 、CoTiO 3 , so that the catalyst activity is reduced, and after the reaction occurs, the catalyst must be regenerated by high temperature (higher than 700°C) reduction
Under these reducing conditions, it is easy to cause the aggregation of the active center of the catalyst, resulting in a significant reduction in catalyst activity (AppliedCatalysis A: General 348(2008) 1-15)

Method used

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  • Method for preparing long-life cobalt-based catalyst for Fischer-Tropsch synthesis

Examples

Experimental program
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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, and the volume of consumed water is 48ml. The aqueous solution with a sucrose mass concentration of 5% was adjusted to a pH value of 3 with sulfuric acid, and the mass ratio of the silica gel to the mixed solution was 1:4, and the silica gel and the sucrose acidic solution were fully mixed and stirred for 2 hours at a temperature of 60°C. Dry at 60°C for 24 hours, and then bake at 800°C for 10 hours in vacuum or nitrogen atmosphere.

[0017] 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 a...

example 2

[0020] Weigh commercially available silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 48ml. The aqueous solution with a sucrose mass concentration of 15% was adjusted to a pH value of 2 with hydrochloric acid, and the mass ratio of the silica gel to the mixed solution was 1:9, and the silica gel and the sucrose acidic solution were fully mixed and stirred at a temperature of 70° C. for 3.5 hours. Dry at 100°C for 16 hours, then vacuum bake at 900°C for 8 hours.

[0021] 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 h...

example 3

[0023] Weigh commercially available silica gel, add distilled water dropwise until initial moistening, and the volume of consumed water is 48ml. The aqueous solution with a sucrose mass concentration of 20% was adjusted to a pH value of 1 with sulfuric acid, and the mass ratio of the silica gel to the mixed solution was 1:12, and the silica gel and the sucrose acidic solution were fully mixed and stirred for 5 hours at a temperature of 80°C. Dry at 120°C for 8 hours, then vacuum bake at 1000°C for 4 hours.

[0024] 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. ...

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Abstract

The invention discloses a method for preparing a long-life cobalt-based catalyst for Fischer-Tropsch synthesis. The method comprises the following steps of: performing surface modification on a silica gel carrier; and loading a metal aid and an active ingredient Co by adopting an immersion method, wherein the surface modification method for the silica gel carrier is to perform immersion treatmentby using acid solution of sugar. Compared with similar catalysts, the catalyst for Fischer-Tropsch synthesis prepared by the method has the advantages of reducing the reaction between the carrier andthe active ingredient in the processes of preparing and using the catalyst, and showing better stability in the reaction process, along with long service life.

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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IPC IPC(8): B01J23/75B01J23/889B01J23/83B01J21/06B01J37/02B01J37/08C10G2/00
Inventor 李杰张舒冬陈楠倪向前张喜文
Owner CHINA PETROLEUM & CHEM CORP
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