Iron-base catalyst for Fischer-Tropsch synthesis and its preparation method

An iron-based catalyst, Fischer-Tropsch synthesis technology, applied in chemical instruments and methods, physical/chemical process catalysts, metal/metal oxide/metal hydroxide catalysts, etc. The problems of large dosage and long oxidation time can achieve the effect of short oxidation time, reduced selectivity and high reactivity

Active Publication Date: 2005-03-23
SYNFUELS CHINA TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the amount of hydrogen peroxide oxidant is large, the oxidation time is long, and the filtration speed of the precipitated slurry is slow

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Put 80kg of FeSO 4 ·7H 2 O was dissolved in 288L deionized water, and then 5.2L of 3mol / L sulfuric acid solution was added. Add 15% H to the mixed solution 2 O 2 8L of aqueous solution, oxidized at 35°C for 2 hours with vigorous stirring. 3.06kg of Cu(NO 3 ) 2 ·3H 2 O and 101g La(NO 3 ) 3 ·6H 2 O was dissolved in 8L of deionized water to obtain a mixed solution of nitric acid and lanthanum nitrate. The mixed solution of copper nitrate and lanthanum nitrate is added to the iron sulfate solution prepared above to obtain a mixed salt solution containing iron, lanthanum and copper. 96kg of Na 2 CO 3 Dissolve in 320L of deionized water to obtain an aqueous solution of sodium carbonate. Heat the mixed acid salt solution and sodium carbonate solution to 85°C separately by using steam through a jacket, and use acid-proof pump and alkali-proof pump to continuously pump the mixed acid salt solution and sodium carbonate solution into a vigorously stirred tank at the same flow rate. In...

Embodiment 2

[0049] According to the steps of Example 1, after beating the obtained filter cake, it was used with a modulus of 3.6 containing 20wt% SiO 2 10.5L of potassium silicate water glass solution was added to the slurry and stirred vigorously. Then add 1 80L of deionized water, beat the slurry, and spray-dry the slurry to obtain a powder of approximately spherical particles. The powder is calcined at 350°C for 5 hours to obtain 26kg of iron-based catalyst. The weight ratio of the catalyst is For Fe 2 O 3 : Fe 3 O 4 : La 2 O 3 :CuO:K 2 O=75:24.2:0.2:5:4:9. After the catalyst is sieved, 50-100μm particles are selected in the slurry-bed laboratory device to evaluate the Fischer-Tropsch synthesis reaction performance.

Embodiment 3

[0051] Put 90kg of FeSO 4 ·7H 2 O was dissolved in 225L of deionized water, and then 6L of 3mol / L sulfuric acid solution was added. Add 5% H to the mixed solution 2 O 2 83L of aqueous solution, oxidized at 50°C for 2.5 hours under vigorous stirring. 3.56kg of CuSO 4 ·5H 2 O and 28.2g La(NO 3 ) 3 ·6H 2 O was dissolved in 15L of deionized water to obtain a mixed salt solution of copper nitrate and lanthanum nitrate. The mixed salt solution of copper nitrate and lanthanum nitrate is added to the iron sulfate solution prepared above to obtain a mixed salt solution containing iron, lanthanum and copper. 140kg of K 2 CO 3 Dissolve in 350L of deionized water to obtain an aqueous solution of sodium carbonate. The mixed salt solution and K 2 CO 3 The solutions were heated to 65℃ respectively, and the mixed acid and K were continuously pumped by the acid-resistant pump and the alkali-resistant pump. 2 CO 3 The solution was poured into a vigorously stirred tank at the same flow rate, and the...

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Abstract

A Fe-based catalyst for the Fischer-Tropsch synthesis contains Re2O3, Fe3O4, La2O3, CuO, K2O and SiO2. It is prepared through using oxidant to oxidize partially the ferrous sulfate to obtain the mixed solution of iron sulfate and ferrous sulfate, mixing with the mixed solution of lanthanum nitrate and copper salt, fast depositing by alkaline compound, washing the deposited slurry, adding potassium silicate-water glass solution, and spray drying.

Description

Technical field [0001] The invention belongs to a catalyst and a preparation method thereof, and specifically relates to an iron-based catalyst containing a lanthanum promoter for Fischer-Tropsch synthesis and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis is a synthesis gas (CO+H) discovered in the 1920s. 2 ) A method of synthesizing liquid fuels, and since the 1950s, large-scale industrialization of coal-based synthetic liquid fuels has been realized in South Africa (see Dry ME's paper published in Catalysis Today, 1990, 6(3), 183-206" The Fischer-Tropsch Process-Commercial Aspects”). Fischer-Tropsch synthesis usually uses iron-based catalysts. Syngas is reacted in fixed-bed, fluidized-bed or slurry-bed reactors equipped with iron-based catalysts to produce the required hydrocarbon products, including gasoline, diesel, and wax. , Naphtha, low-carbon olefins, etc. Syngas can be produced from carbon-containing raw materials such as coal, nat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/825C07C1/04
Inventor 李永旺吴宝山相宏伟白亮张志新
Owner SYNFUELS CHINA TECH CO LTD
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