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Synthetic gas conversion catalyst, and preparation method and applications thereof

A synthesis gas conversion and catalyst technology, applied in physical/chemical process catalysts, chemical instruments and methods, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of improving methane selectivity, reducing activity stability, preparing The process is complex and other problems, to achieve the effect of improving the degree of dispersion and reduction, reducing the concentration of hydroxyl groups, and simple preparation

Active Publication Date: 2014-05-07
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

[0019] Weigh commercially available silica gel (the pore volume is 1.06ml / g, the specific surface area is 386.81m 2 per 10 grams of this silica gel with distilled water added dropwise until the volume of water consumed during initial moistening is 16ml, the following examples all use this silica gel) 30g, the pH value is adjusted to 5.5, and the mass concentration of zinc ions is 2% zinc nitrate The solution is excessively impregnated on the silica gel carrier, the impregnation temperature is 75°C, and the impregnation time is 50h. After impregnation, the excess zinc nitrate solution is filtered off, dried at 100°C for 20h, and roasted at 400°C for 8h. 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 treated with zinc nitrate solution, impregnate it, 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.

[0020] Catalyst e...

example 2

[0022] Weigh 30 g of commercially available silica gel, adjust the pH value to 5, and use a zinc nitrate solution with a mass concentration of zinc ions of 1% to excessively impregnate the silica gel carrier. The impregnation temperature is 60 ° C, and the impregnation time is 10 hours. Remove excess zinc nitrate solution, dry at 50°C for 36h, and bake at 300°C for 2h. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, impregnate it, 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

[0024] Weigh 30 g of commercially available silica gel, and use a zinc sulfate solution with a pH value of 6 and a zinc ion concentration of 3% to excessively impregnate the silica gel carrier. The impregnation temperature is 80°C, and the impregnation time is 100 hours. Filter off excess zinc sulfate solution, dry at 150°C for 2h, and bake at 500°C for 15h. Based on the final catalyst cobalt content of 15wt%, weigh cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, impregnate it, 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-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 discloses a synthetic gas conversion catalyst. According to the synthetic gas conversion catalyst, modified silica gel is taken as a carrier; cobalt is taken as an active component, and accounts for 5 to 35wt% of the synthetic gas conversion catalyst; and the modified silica gel is modified with a zinc-containing aqueous solution with a pH value of 3 to 4.5 via excessive immersion treatment. The invention also discloses a preparation method of the synthetic gas conversion catalyst. The preparation method comprises following steps: silica gel is taken as the carrier, and is subjected to surface modification, wherein excessive immersion treatment with the zinc-containing aqueous solution with a pH value of 3 to 4.5 is used for surface modification of the silica gel carrier; and loading of the active component Co is carried out via immersion method. The invention also discloses applications of the synthetic gas conversion catalyst in Fischer-Tropsch synthetic reaction. The preparation method is simple; and the synthetic gas conversion catalyst is high in activity and stability.

Description

technical field [0001] The invention relates to a synthesis gas conversion catalyst and its preparation method and application, in particular to a synthesis gas conversion 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, and various promoter elements such as Zr, K, Zn and Cu have a great influence on the activity of Fischer-Tropsch catalysts. Activit...

Claims

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Application Information

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IPC IPC(8): B01J23/80C10G2/00
Inventor 桂兴华
Owner CHINA PETROLEUM & CHEM CORP
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