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Precipitated iron catalyst for Fischer-Tropsch synthesis and preparation method thereof

A technology for synthesis of catalysts and catabolites, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc., can solve problems such as increasing CO2 emissions and wasting raw material CO, and achieves a simple, continuous and economical synthesis process Production cost, pollution reduction effect

Active Publication Date: 2014-05-21
CHNA ENERGY INVESTMENT CORP LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Patent CN1233462C discloses a method for preparing Fischer-Tropsch synthesis iron catalyst by precipitation method, its main composition is Fe-Cu-K 2 O-SiO 2 -Na 2 O, where Na 2 Although the addition of O can increase the activity slightly, it will increase the by-product CO of the catalyst. 2 selectivity, while the high CO 2 Selectivity will not only waste raw material CO, but also increase CO 2 emissions

Method used

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  • Precipitated iron catalyst for Fischer-Tropsch synthesis and preparation method thereof
  • Precipitated iron catalyst for Fischer-Tropsch synthesis and preparation method thereof

Examples

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Effect test

Embodiment 1

[0032] 1) Weigh 4.04kg of ferric nitrate nonahydrate, then add the corresponding amount of potassium titanium oxalate and copper nitrate, add deionized water to dissolve, so that the weight ratio of each component in the mixed salt solution is Fe:Ti:Cu=100:11.2: 8.5, the concentration of Fe ions in the mixed salt solution is 0.5mol / L.

[0033] Take 2.8 kg of sodium carbonate, add deionized water to dissolve it, and prepare a 2mol / L sodium carbonate solution. Use the sodium carbonate solution as a precipitant and preheat the mixed salt solution to 65°C, and use co-current precipitation to obtain a mixed salt precipitation slurry. During the entire co-current precipitation process, the temperature of the mixed salt precipitation slurry was kept at 65° C., and the pH value was always 7.0.

[0034] 2) The mixed salt precipitation slurry was kept at 65°C for aging for 2 hours, filtered and washed to obtain a catalyst filter cake with a conductivity of the filtrate below 1000 μs / cm....

Embodiment 2

[0038] 1) Weigh 4.04kg of ferric nitrate nonahydrate, then add the corresponding amount of potassium titanium oxalate and copper sulfate, add deionized water to dissolve, so that the weight ratio of each component in the mixed salt solution is Fe:Ti:Cu=100:0.4:1.0 , the concentration of Fe ions in the mixed salt solution is 2mol / L.

[0039] Take 2.8kg of sodium carbonate, add deionized water to dissolve it, and prepare a 0.5mol / L sodium carbonate solution, use the sodium carbonate solution as a precipitant and preheat the mixed salt solution to 40°C, and use co-current precipitation to obtain a mixed salt precipitation slurry . The temperature of the mixed salt precipitation slurry is kept at 40° C. and the pH value is always 10 throughout the co-current precipitation process.

[0040] 2) Keep the mixed salt precipitation slurry at 40°C for aging, filter and wash for 0.1 hour to obtain a catalyst filter cake with a conductivity of the filtrate below 1000 μs / cm.

[0041] 3) A...

Embodiment 3

[0044] 1) Weigh 4.04kg of ferric nitrate nonahydrate, then add the corresponding amount of potassium titanium oxalate and copper nitrate, add deionized water to dissolve, so that the weight ratio of each component in the mixed salt solution is Fe:Ti:Cu=100:1:7 , the concentration of Fe ions in the mixed salt solution is 1.2mol / L.

[0045] Take 2.2kg of sodium carbonate, add deionized water to dissolve and prepare a 1.5mol / L sodium carbonate solution, use the sodium carbonate solution as a precipitating agent and preheat the mixed salt solution to 60°C, and use co-current precipitation to obtain a mixed salt precipitation slurry . The temperature of the mixed salt precipitation slurry is kept at 60° C. and the pH value is always 5.5 throughout the co-current precipitation process.

[0046] 2) Keep the mixed salt precipitation slurry at 30°C for aging for 5 hours, filter and wash to obtain a catalyst filter cake with a conductivity of the filtrate below 1000 μs / cm.

[0047] 3)...

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Abstract

The invention discloses a precipitated iron catalyst for Fischer-Tropsch synthesis and a preparation method thereof. The weight ratio of the components including Fe, Y, Ti, Cu, K and SiO2 in the catalyst is 100:(0.5-7.5):(0.4-11.2):(1.0-8.5):(1.0-7.0):(5-30), wherein Y, Ti and K exist in the form of oxide; Fe exists in the form of Fe2O3; Cu exists in the form of CuO. The catalyst provided by the invention has good activity and product selectivity, is capable of achieving high CO conversion rate and low CH4 and CO2 selectivity, increasing the main product, reducing the byproducts and reducing the environmental pollution on the premise of ensuring the raw material conversion rate and the effective product selectivity when being applied to Fischer-Tropsch synthesis for preparing oil products and paraffin, and is suitable for joint production of gasoline, diesel and high-quality paraffin in the large-scale fixed bed Fischer-Tropsch synthesis industry.

Description

technical field [0001] The invention relates to the technical field of catalysts, in particular to a catalyst for precipitated iron Fischer-Tropsch synthesis and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis is an indirect coal liquefaction technology, based on synthesis gas (CO+H 2 ) is a synthetic method in which raw materials are synthesized under catalyst and appropriate reaction conditions to obtain oil products, wax products, olefins and oxygen-containing organic compounds. Syngas can be obtained from natural gas conversion, shale gas conversion or coal gasification. The main active metals of Fischer-Tropsch catalysts can be iron, cobalt, nickel, ruthenium, etc. Among them, the Fischer-Tropsch synthesis catalyst with iron as the main component has the characteristics of wide hydrogen-to-carbon ratio range, high conversion rate and low cost, making it more suitable for synthesis gas Fischer-Tropsch synthesis, especially for coal...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83C10G2/00
Inventor 王鹏吕毅军林泉公磊门卓武石玉林
Owner CHNA ENERGY INVESTMENT CORP LTD
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