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Magnesium-containing ft synthetic catalyst and preparation method thereof

A Fischer-Tropsch synthesis and catalyst technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc., can solve the problem of unsatisfactory catalyst selectivity and unsatisfactory proportion of long-chain alkanes High and difficult to achieve industrial requirements, etc., to achieve the effect of high-efficiency industrial production, high selectivity of multi-carbon linear alkanes, and good reactivity

Inactive Publication Date: 2009-04-29
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing catalysts are not ideal in terms of selectivity, the product contains more methane and carbon dioxide, and the proportion of long-chain alkanes is not high; and the preparation method is relatively complicated, and it is difficult to meet the industrial requirements

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Weigh 1835 g of iron nitrate and 66.5 g of magnesium nitrate, add deionized water to dissolve, prepare 7L mixed nitrate solution, and preheat it to 60°C on an electromagnetic heating furnace. Take 1014g of ammonium carbonate, add deionized water to dissolve, prepare 4L ammonium carbonate solution, and preheat to 40°C.

[0025] The two solutions are poured into the reaction beaker to produce precipitation. There is 1L of deionized water preheated to 60°C in the beaker. Keep the temperature at 60°C and the pH value is controlled at 6.5±0.3. Stir the reaction, leave it to age for 0.5 hours, and filter and wash it. Co-precipitation filter cake. Move the co-precipitation filter cake into a beaker, add 450ml of deionized water to make the slurry, the solid content of the slurry is about 20%, and add 100g of SiO 2 :K 2 O=3.2, SiO 2 A potassium-containing silica sol with a mass concentration of 28.5% was mixed with the slurry uniformly, 150 mL of a copper nitrate solution with a ma...

Embodiment 2

[0027] Follow the steps described in Example 1 to obtain the precipitated filter cake. Move the co-precipitation filter cake into a beaker, add 2100ml deionized water to make a slurry, the solid content of the slurry is about 10%, add 110g SiO 2 :K 2 O=3.8, SiO 2 The potassium-containing silica sol with a mass concentration of 25.5% is uniformly mixed with the slurry, 360 ml of a copper nitrate solution with a mass concentration of 10% is added, and the mixture is stirred and immersed in a constant temperature water bath of 55° C. for 50 minutes. Put the mixed slurry into a pressure spray dryer for molding, the hot air temperature at the inlet is 300°C, and the outlet temperature is 130°C, and the resulting dried powder is put into a muffle furnace for roasting under the conditions of 450°C for 2 hours. This catalyst is counted as catalyst 2.

Embodiment 3

[0029] Weigh 1650 g of ferric nitrate and 96 g of magnesium nitrate, add deionized water to dissolve, prepare a 5L mixed nitrate solution, and preheat it to 70°C on an electromagnetic heating furnace. Take 1224g of ammonium carbonate, add deionized water to make 5L ammonium carbonate solution, and preheat to 45°C.

[0030] Pour the two solutions into the reaction beaker to produce precipitation. There is 1L of deionized water preheated at 75℃ in the beaker, keep the temperature at 75℃, control the pH at 8.0±0.5, stir the reaction, leave it to age for 3 hours, filter and wash to obtain the co-precipitation filter cake . Move the co-precipitation filter cake into a beaker, add 1000ml deionized water to make a slurry, the solid content of the slurry is about 15%, add 180g SiO 2 :K 2 O=3.2, SiO 2 The potassium-containing silica sol with a mass concentration of 26.7% was uniformly mixed with the slurry, 460ml of copper nitrate solution with a mass concentration of 10% was added, and th...

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PUM

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Abstract

The invention relates to an Mg-contained Fischer-Tropsch synthesis catalyst and a preparation method thereof. According to the weight ratio, the catalyst comprises 100 of Fe, 0.5-20 of Mg, 0.5-4.9 of Cu, 0.3-15 of K and 5-50 of SiO2. The catalyst has good reaction activity and further improves the reaction selectivity, wherein, the selectivity of firedamp is less than 3 percent, the selectivity of the CO2 is less than 35 percent; furthermore, the catalyst has high selectivity for multi-carbon straight chain alkane and simple preparation process, and is suitable for industrial production in large scale.

Description

Technical field [0001] The invention relates to the field of catalysts, in particular to a Fischer-Tropsch synthesis catalyst and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis is one of the indirect coal liquefaction technologies. This technology is based on syngas (CO+H 2 ) Is the process of synthesizing paraffin-based liquid fuels with catalysts (mainly iron-based and cobalt-based) and appropriate reaction conditions. It was developed by German chemists F. Fischer and H. Toropsch in 1923, so it is referred to as Fischer-Tropsch synthesis or F-T synthesis technology. It is based on syngas (CO+H 2 ) Is the process of synthesizing paraffin-based liquid fuels with raw materials under catalysts and appropriate reaction conditions. [0003] Fischer-Tropsch synthesis catalysts are mainly divided into iron-based catalysts and cobalt-based catalysts. Among them, iron-based catalysts have good sulfur resistance and high conversion activity, and are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/78C07C1/04
Inventor 王鹏门卓武黄剑薇刘化章
Owner CHNA ENERGY INVESTMENT CORP LTD
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