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

A technology for catalyst, torrefaction synthesis, applied in chemical instruments and methods, preparation of liquid hydrocarbon mixtures, catalysts for physical/chemical processes, etc. high CO conversion rate and reactivity, high selectivity and reasonable distribution

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

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Problems solved by technology

However, not only the conditions are harsh during the preparation of the skeleton iron catalyst, such as high temperature conditions, the metal needs to be heated to a high-temperature molten state, and an alcohol solution of potassium is used during washing, the cost is also high, and the economy is not as good as that of the precipitated iron catalyst; an

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

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[0031] In the preparation method provided by the present invention, soluble metal salts include but are not limited to metal nitrates, sulfates and oxalates, as long as they have good solubility in deionized water. Specifically, Fe raw materials are preferred Fe(NO 3 ) 3 ; Mn raw material is preferably Mn (NO 3 ) 2 ; Ti raw material is preferably potassium titanium oxalate (K 2 TiO(C 2 O 4 ) 2 ); The raw material of Cu is preferably Cu(NO 3 ) 2 Or CuCl 2 .

[0032] In the preparation method provided by the present invention, the precipitant solution in step (2) includes, but is not limited to, a deionized aqueous solution of ammonium carbonate, sodium carbonate, potassium carbonate, potassium bicarbonate, sodium hydroxide, potassium hydroxide, and ammonia , Preferably ammonium carbonate or sodium carbonate, and the concentration of the precipitation agent solution is 0.3-2 mol / L, preferably 0.5-1.5 mol / L.

[0033] During the precipitation reaction, the specific precipitation method...

Example Embodiment

[0043] Example 1

[0044] Weigh 40.4kg of iron nitrate nonahydrate, manganese nitrate (Mn(NO 3 ) 2 ·4H 2 O) 3.43kg, copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 0.8kg, potassium titanium oxalate dihydrate (K 2 TiO(C 2 O 4 ) 2 ·2H 2 O) 2.43kg, add deionized water to dissolve, prepare Fe concentration 2.0mol / L metal salt solution, preheat to 70℃. Take 19 kg of sodium carbonate, add deionized water to dissolve it, configure it into a sodium carbonate precipitant solution with a concentration of 1.0 mol / L, and preheat to 70°C.

[0045] The metal salt solution and the precipitant solution were poured into a reaction beaker containing 300 mL of 70°C deionized water, and the precipitation reaction was carried out while keeping the temperature at 70°C and stirring. When the pH is controlled at 6.0±0.3, the stirring is ended, and the precipitation reaction time is 5 minutes to obtain the precipitation slurry. The precipitation slurry was aged at 80°C for 0.5h, filtered and washed twice to obtain a...

Example Embodiment

[0049] Example 2

[0050] Weigh 40.4kg of iron nitrate nonahydrate, manganese nitrate (Mn(NO 3 ) 2 ·4H 2 O) 0.8kg, copper nitrate (Cu(NO 3 ) 2 ·3H 2 O) 1.1kg, potassium titanium oxalate dihydrate (K 2 TiO(C 2 O 4 ) 2 ·2H 2 O) 1.0kg, add deionized water to dissolve, prepare Fe concentration of 2.2mol / L metal salt solution, preheat to 60℃. Weigh 35 kg of solid ammonium carbonate, add deionized water to dissolve, prepare an ammonium carbonate precipitant solution with a concentration of 0.7 mol / L, and preheat to 35°C.

[0051] Pour the metal salt solution and the precipitant solution into a reaction beaker containing 25kg of deionized water at 40°C, keep the temperature at 40°C and perform the precipitation reaction while stirring, to obtain a precipitation slurry. The precipitation reaction time is 70 minutes. Adjust the pH of the precipitation slurry to 8.5±0.3, age at 60°C for 3.5h, filter and wash three times to obtain a co-precipitation filter cake.

[0052] Add water to the co-pr...

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Abstract

The invention discloses a precipitated iron catalyst for Fischer-Tropsch synthesis and a preparation method thereof. The catalyst comprises the following components in parts by weight: 100 parts of Fe, 0.3-20 parts of Mn, 0.1-15 parts of Ti, 0.2-10 parts of Cu, 0.3-10 parts of K and 3-40 parts of SiO2. By optimizing the components in the catalyst and ratios, the final precipitated iron catalyst has good degree of sphericity, higher abrasion strength and high specific surface area. Besides, the preparation process has the advantages of mild conditions, higher CO conversion rate and reaction activity, high long chain hydrocarbon C<5+> selectivity, low byproduct CH4 and waste product CO2 selectivity, reasonable hydrocarbon product distribution and low contents of methane and carbon dioxide in the final product, is suitable for industrial production of oil products and wax obtained by virtue of Fischer-Tropsch synthesis, is economical, simple and convenient and can be used for continuously producing a microspheric precipitated iron manganese-titanium system catalyst for Fischer-Tropsch synthesis.

Description

technical field [0001] The invention relates to the technical field of Fischer-Tropsch synthesis, in particular to a catalyst for Fischer-Tropsch synthesis of precipitated iron and a preparation method thereof. Background technique [0002] Fischer-Tropsch synthesis is based on synthesis gas (CO + H 2 ) as the raw material, the reaction raw material synthesis gas can be obtained from natural gas conversion or coal gasification, one of the indirect coal liquefaction technologies for synthesizing paraffin-based liquid fuels under catalysts (mainly iron-based and cobalt-based) and appropriate reaction conditions. This technology is named after its original developers, German chemists F. Fischer and H. Tropsch, that is, Fischer-Tropsch synthesis or F-T synthesis technology. Fischer-Tropsch synthesis catalysts are mainly divided into iron-based and cobalt-based catalysts. Among them, iron-based catalysts have good sulfur resistance and high conversion activity, and are especiall...

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Application Information

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IPC IPC(8): B01J23/889B01J35/10C10G2/00C10G73/00
Inventor 王鹏公磊吕毅军林泉武鹏门卓武石玉林
Owner CHNA ENERGY INVESTMENT CORP LTD
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