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A kind of cobalt-based Fischer-Tropsch synthesis catalyst and its preparation method and application

A catalyst and Tropsch synthesis technology, applied in the direction of chemical instruments and methods, preparation of liquid hydrocarbon mixtures, physical/chemical process catalysts, etc., can solve the problems of methane selectivity improvement, activity stability reduction, unfavorable industrial application, etc., to improve Dispersion and reduction degree, reduction of hydroxyl concentration, beneficial effects for industrial production

Active Publication Date: 2016-03-02
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the method of introducing organic groups on the surface of silica gel support is not only complicated in preparation process, high in cost, and not conducive to industrial application, but also due to the steric hindrance of organic groups and their strong interaction with the generated Fischer-Tropsch synthesis products, resulting in Decreased activity stability, increased methane selectivity

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Weigh commercially available silica gel (the pore volume is 1.06ml / g, the specific surface area is 386.81m 2 / g, add distilled water dropwise to initial moistening, the volume of consumed water is 48ml, the silica gel used in the following examples) 30g, add to the pH value of 5 (the pH value of the solution is adjusted by nitric acid, the same below), the mass of zirconium ions Immerse in zirconium nitrate aqueous solution with a percentage content of 2%, the immersion time is 50h, and the temperature of the zirconium-containing impregnating solution is 70°C. After impregnation, filter off excess impregnation liquid, dry at 90°C for 16 hours, and bake at 450°C for 7 hours. Based on the final catalyst cobalt content of 5wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier loaded with zirconium for impregnation, 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. ...

example 2

[0023] Weigh 30g of commercially available silica gel, add it to a zirconium nitrate aqueous solution with a pH value of 4, and a zirconium ion mass percentage of 1% for immersion. The immersion time is 100h, and the temperature of the zirconium-containing immersion solution is 60°C. After impregnation, filter off excess impregnating liquid, dry at 50°C for 8 hours, and bake at 300°C for 4 hours. Based on the final catalyst cobalt content of 10wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier loaded with zirconium for impregnation, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst is designated C-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

[0025] Weigh 30g of commercially available silica gel, add it to a zirconium nitrate aqueous solution with a pH value of 6, and a zirconium ion mass percentage of 5% for immersion. The immersion time is 50h, and the temperature of the zirconium-containing impregnation solution is 80°C. After impregnation, filter off excess impregnating liquid, dry at 100°C for 24 hours, and bake at 500°C for 10 hours. Based on the final catalyst cobalt content of 35wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier loaded with zirconium for impregnation, age for 3 hours, dry at 80°C for 8 hours, and bake at 350°C for 4 hours. The resulting catalyst was designated C-5. 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-5 catalyst.

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PUM

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Abstract

The invention discloses a cobalt-based catalyst, and a preparation method and applications thereof. According to the cobalt-based catalyst, silica gel is taken as a carrier; zirconium is taken as a metal auxiliary agent; cobalt is taken as an active component; the cobalt-based catalyst comprises, by weight, 5 to 35% of the active component cobalt; before loading of the active component cobalt, the silica gel carrier is immersed in a zirconium-containing impregnation liquid with a pH value of 4 to 6 for zirconium impregnation via supersaturation impregnation method. The preparation method of the cobalt-based Fischer-Tropsch synthesis catalyst comprises following steps: silica gel is taken as the carrier; the silica gel carrier is immersed in a zirconium-containing impregnation liquid with a pH value of 4 to 6 for zirconium impregnation via supersaturation impregnation method; and then loading of the active component Co is carried out via impregnation method. The invention also discloses applications of the cobalt-based Fischer-Tropsch synthesis catalyst in Fischer-Tropsch synthetic reaction. The preparation method of the cobalt-based Fischer-Tropsch synthesis catalyst is simple; and the cobalt-based Fischer-Tropsch synthesis catalyst is high in activity and stability.

Description

technical field [0001] The invention relates to a cobalt-based Fischer-Tropsch synthesis catalyst and its preparation method and application, in particular to a cobalt-based Fischer-Tropsch synthesis catalyst with modified silica gel as a carrier, its preparation method and application. Background technique [0002] Fischer-Tropsch synthesis refers to synthesis gas (CO+H 2 ) on the catalyst to catalyze the reaction of synthesizing hydrocarbon liquid fuel. 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. plays an important role, and the catalyst support is generally amorphous SiO 2 、TiO 2 and Al 2 o 3 ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J23/75C10G2/00
Inventor 李杰张舒冬张喜文倪向前宋喜军
Owner CHINA PETROLEUM & CHEM CORP
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