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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AI-Extracted 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 ...

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.

Application Domain

Liquid hydrocarbon mixture productionMetal/metal-oxides/metal-hydroxide catalysts

Technology Topic

SyngasSurface modification +6

Examples

Experimental program(8)
Comparison scheme(2)

Example Embodiment

[0018] Example 1

[0019] Weigh commercially available silica gel (pore volume is 1.06ml/g, specific surface area is 386.81m 2 /g, the volume of water consumed when distilled water is added dropwise for every 10 grams of this silica gel to the initial moisture is 16ml, the following examples all use this silica gel) 30g, the pH value is adjusted to 5.5, the mass concentration of zinc ions is 2% zinc nitrate The solution performs excessive immersion treatment on the silica gel carrier, the immersion treatment temperature is 75°C, and the immersion treatment time is 50h. After immersion, the excess zinc nitrate solution is filtered off, dried at 100°C for 20h, and baked at 400°C for 8h. Based on the final cobalt content of the catalyst at 5wt%, weigh the cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, immerse it, age for 3 hours, dry at 80°C for 8 hours, and calcinate at 350°C for 4 hours. The obtained catalyst is designated as C-1.

[0020] The catalyst evaluation test was carried out in a high-pressure continuous stirred tank reactor, using paraffin as a solvent, and reducing with pure hydrogen at 350°C for 12 hours at a pressure of 1.0 MPa. After cooling, the synthesis gas is switched to react. The reaction effluent is collected by a heat trap and a cold trap respectively. The reaction conditions are 220℃, 1000h -1 , 2.0MPa, H 2 /CO=2 (molar ratio). The results of the Fischer-Tropsch synthesis reaction on C-1 catalyst are shown in Table 1 when running for 200 hours.

Example Embodiment

[0021] Example 2

[0022] Weigh 30g of commercially available silica gel, use a zinc nitrate solution with a pH of 5 and a mass concentration of zinc ions of 1% to over-dip the silica gel carrier. The temperature of the dipping treatment is 60℃, and the dipping treatment time is 10h. Remove excess zinc nitrate solution, dry at 50°C for 36h, and roast at 300°C for 2h. Based on the final catalyst cobalt content of 15wt%, weigh the cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, immerse it, age for 3 hours, dry at 80°C for 8 hours, and roast at 350°C for 4 hours. The obtained catalyst is designated as C-2. The catalyst activity evaluation experimental conditions are the same as in Example 1. The results of the C-2 catalyst Fischer-Tropsch synthesis reaction are shown in Table 1.

Example Embodiment

[0023] Example 3

[0024] Weigh 30g of commercially available silica gel, use a zinc sulfate solution with a pH of 6 and a mass concentration of zinc ions of 3% to over-dip the silica gel carrier. The dipping temperature is 80℃ and the dipping time is 100h. After dipping Filter out excess zinc sulfate solution, dry at 150°C for 2h, and roast at 500°C for 15h. Based on the final catalyst cobalt content of 15wt%, weigh the cobalt nitrate and dissolve it in 48ml of water, add it to the silica gel carrier treated with zinc nitrate solution, immerse it, age for 3 hours, dry at 80°C for 8 hours, and roast at 350°C for 4 hours. The obtained catalyst is designated as C-3. The catalyst activity evaluation experimental conditions are the same as in Example 1. The results of the C-3 catalyst Fischer-Tropsch synthesis reaction are shown in Table 1.

PUM

Property	Measurement	Unit
Specific surface area	386.81	m²/g

Description & Claims & Application Information

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Synthetic gas conversion catalyst, and preparation method and applications thereof

AI-Extracted Technical Summary

Problems solved by technology

Abstract

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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