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

A Fischer-Tropsch synthesis and catalyst technology, which is used in catalyst activation/preparation, chemical instruments and methods, preparation of liquid hydrocarbon mixtures, etc. Effect

Inactive Publication Date: 2012-09-19
CHNA ENERGY INVESTMENT CORP LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] The present invention aims to provide a Fischer-Tropsch synthesis precipitated iron catalyst and its preparation method to solve the technical problem that iron-based catalysts in the prior art tend to produce fine powder when used in a slurry bed reactor

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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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preparation example Construction

[0035] According to a typical implementation of the present invention, the preparation method of the above-mentioned catalyst includes the following steps: 1) mixing the nitrate or oxide of Fe, the nitrate or oxide of Me and the binding agent to obtain the first mixed solution, the first The mixed solution is co-precipitated with ammonium carbonate or ammonia water to obtain a precipitation slurry, wherein Me is a transition metal element Zr and / or Y, the binder is an aqueous solution of a silicon compound, and the binder is introduced into the second SiO in a mixed solution 2 The mass ratio to Fe is 0.01 to 4.9:100; 2) After the precipitation slurry is aged for a certain period of time at the same temperature as the precipitation reaction, it is transferred to a suction filtration device for suction filtration and washing to obtain a filter cake, which is added to the filter cake Deionized water for repulping and reintroducing SiO 2 , K and Cu additives to obtain the second ...

Embodiment 1

[0070] 1) Weigh 13.0Kg Fe(NO 3 ) 3 9H 2 O, 0.09Kg Y 2 o 3 , add 50L deionized water and stir to dissolve. Adding 1.20Kg mass concentration is the K of 15wt% in this solution that is stirring again. 2 SiO 3 aqueous solution, fully stirred to obtain the first mixed solution. Weigh 8.5Kg (NH 4 ) 2 CO 3 , Add 30.0L deionized water and stir to dissolve to obtain a precipitated slurry. The iron salt mixed solution is heated to above 65° C. by means of jacket heating, and then flows into a vigorously stirred reaction tank with the heated precipitant solution to produce co-precipitation. Control the precipitation temperature in the reaction tank at 65°C and the pH at 7.5 by adjusting the acid and alkali salt delivery pumps respectively.

[0071] 2) After the precipitation is completed, age the precipitated slurry at the same temperature for 30 minutes, transfer it to a suction filtration device for suction filtration within 8 minutes, discard the filtrate and wash the filte...

Embodiment 2

[0077] 1) Prepare co-precipitation filter cake with the same method described in Example 1.

[0078] 2) Repulping with deionized water with a filter cake:water mass ratio of 7.5:1. Add 1.16kg of binder 2 solution and 0.21kg of 45% KOH aqueous solution into the slurry while stirring, keep the system temperature at about 70°C, and stir under high shear for 25min. Then add 0.47Kg 40wt% Cu(NO 3 ) 2 aqueous solution, and continued high-shear stirring for 30 minutes to obtain the second mixed solution, at which point the pH value of the system obtained from the second mixed solution would be greatly reduced from the original value. However, if the pH value of the copper nitrate solution is still not lower than 4.5 after all the copper nitrate solution is poured out, the pH value can be adjusted to about 4.5 with additional dilute nitric acid. Stirring was continued for 60 min at the above system temperature. Finally, a catalyst slurry with a total solid content of about 26 wt % ...

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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, 0.1-6 parts of Cu, 0.5-7 parts of K, 0.1-5 parts of Me and 2.5-27 parts of SiO2, wherein Me is a transition metal Zr and / or Y, and Fe, Cu, K and Me exsist in the form of oxides. In the precipitation process of the precipitated iron catalyst for Fischer-Tropsch synthesis, proper transition metal assistants and small amounts of silicon dioxide assistant are introduced by the in-situ reaction and are organically combined with the subsequently introduced nano silicon oxide binding agent, thereby greatly enhancing the abrasion resistance of the finally prepared catalyst, improving the chemical stability and improving the problem of fine powder generated on the slurry-state bed reactor.

Description

technical field [0001] The invention relates to the field of catalysts and their preparation, in particular to a Fischer-Tropsch synthesis precipitated iron catalyst and a preparation method thereof. Background technique [0002] Fischer-Tropsch (FT) synthesis refers to the synthesis of CO and H 2 The catalytic reaction in which the main synthesis gas is converted into hydrocarbons by means of a catalyst, and the synthesized hydrocarbon products or oxygenated compounds can be used as vehicle liquid fuels or chemical raw materials (M.E.Dry, Catalysis-Sience and Technology, P.160, Springer-Verlag (1981)). Iron and cobalt are recognized industrially produced and applied catalysts for FT synthesis. Iron-based catalysts have cheap and easy-to-obtain raw materials and a wide range of applicable reaction conditions (such as the H 2 / CO ratio, FT reaction temperature, etc.) and other characteristics. The preparation methods generally include precipitation method, melting method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/83B01J23/78B01J35/08B01J37/03C10G2/00
Inventor 常海朱加清程萌谢晶常鸿雁
Owner CHNA ENERGY INVESTMENT CORP LTD
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