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Cobalt-based fischer tropsch synthesis catalyst and synthesis method thereof

A synthesis method and catalyst technology, applied in the field of cobalt-based Fischer-Tropsch synthesis catalyst and its synthesis, can solve the problems of increased reaction cost, harshness, and small specific gravity of hexagonal close-packed cobalt, and achieve short synthesis time, high activity and selectivity high effect

Inactive Publication Date: 2018-02-09
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the carbonization process not only increases the reaction cost, but also the high temperature and long time treatment is likely to have a profound impact on the original structure of the catalyst. In addition, for Al 2 o 3 ,TiO 2 For carriers with strong interactions such as carbonization, the conditions of the carbonization process must be more stringent, such as increasing the carbonization temperature and carbonization time, and the final proportion of hexagonal close-packed cobalt is still small

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  • Cobalt-based fischer tropsch synthesis catalyst and synthesis method thereof
  • Cobalt-based fischer tropsch synthesis catalyst and synthesis method thereof
  • Cobalt-based fischer tropsch synthesis catalyst and synthesis method thereof

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Embodiment 1

[0041] A cobalt-based Fischer-Tropsch synthesis catalyst, the catalyst is a pure phase hexagonal close-packed (hcp) crystal form cobaltous oxide loaded on a carrier, and its preparation method is as follows:

[0042] Under the mixed gas atmosphere of hydrogen and argon (the hydrogen gas fraction is 10%, the mixed gas flow rate is 40ml / min), 50g benzylamine, 0.05g cobalt (III) acetylacetonate and 3g carbon nanofiber (CNF) are added into three necks Mix the flask, stir at room temperature (25°C) for 5min, then ultrasonically disperse for 1h, heat the three-necked flask to 80°C in an oil bath and keep it for 8min, then transfer to an oil bath previously heated to 200°C to reflux for 1.5h , stop heating, when cooled to 70°C, centrifuge, remove the supernatant, wash the black solid obtained three times with ethanol (15mL each time), transfer the black solid to a crucible, put it in an oven, and heat it at 60°C Dry for 5 hours to obtain the cobalt-based Fischer-Tropsch synthesis cat...

Embodiment 2

[0047] A cobalt-based Fischer-Tropsch synthesis catalyst, the catalyst is a pure phase hexagonal close-packed (hcp) crystal form cobaltous oxide loaded on a carrier, and its preparation method is as follows:

[0048] Under the mixed gas atmosphere of hydrogen and argon (the hydrogen gas fraction is 10%, the mixed gas flow rate is 40ml / min), 50g benzylamine, 0.1g cobalt (III) acetylacetonate and 3g carbon nanofiber (CNF) are added into the three-neck Mix the flask, stir at room temperature (25°C) for 5min, then ultrasonically disperse for 1h, heat the three-necked flask to 80°C in an oil bath and keep it for 8min, then transfer to an oil bath previously heated to 200°C to reflux for 1.5h , stop heating, when cooled to 70°C, centrifuge, remove the supernatant, wash the black solid obtained three times with ethanol (15mL each time), transfer the black solid to a crucible, put it in an oven, and heat it at 60°C Dry for 5 hours to obtain the cobalt-based Fischer-Tropsch synthesis c...

Embodiment 3

[0054] A cobalt-based Fischer-Tropsch synthesis catalyst, the catalyst is a pure phase hexagonal close-packed (hcp) crystal form cobaltous oxide loaded on a carrier, and its preparation method is as follows:

[0055] Under the mixed gas atmosphere of hydrogen and argon (hydrogen gas fraction is 10%, mixed gas flow rate 40ml / min), 50g benzylamine, 0.5g cobalt (III) acetylacetonate and 3g carbon nanofiber (CNF) are added into three Neck flask was mixed, stirred at room temperature (25°C) for 5min and then ultrasonically dispersed for 1h. The three-necked flask was heated to 80°C in an oil bath and kept for 8min, then transferred to an oil bath previously heated to 200°C and refluxed for 1.5 h, stop heating, and when cooled to 70°C, centrifuge, remove the supernatant, wash the resulting black solid three times with ethanol (15mL each time), transfer the black solid to a crucible, put it in an oven, and heat it at 60°C Drying for 5 hours under the hood to obtain the cobalt-based F...

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Abstract

The invention discloses a cobalt-based fischer tropsch synthesis catalyst. The catalyst is to load pure phase hexagonal close packing crystal form cobalt oxide on a carrier, wherein the particle sizeof cobalt oxide nanoparticles is 3 to 50 nm and the loading quantity of cobalt is 0.5 to 20 percent. The synthesis method comprises the following steps: under the mixed gas atmosphere of hydrogen andargon, mixing organic amine, acetylacetone cobalt salt and a catalyst carrier uniformly, heating to 80 to 100 DEG C, performing heat preservation for 2 to 8 minutes, rapidly heating to 175 to 300 DEGC, refluxing for 1.5 to 4 hours, stopping heating, cooling, centrifuging, washing and drying to obtain the cobalt-based fischer tropsch synthesis catalyst, wherein the molar ratio of the organic amineto the acetylacetone cobalt salt is 1 / 5 to 1 / 1000 and the mass ratio of the organic amine to the carrier is 1 / 1 to 1 / 50. The catalyst is loaded with the pure phase hexagonal close packing crystal form cobalt oxide which can maintain the original crystal form after being reduced, so that the pure phase hexagonal close packing crystal form cobalt (hcp type cobalt) with high catalytic activity is obtained.

Description

technical field [0001] The invention relates to the technical field of Fischer-Tropsch synthesis catalysts, in particular to a cobalt-based Fischer-Tropsch synthesis catalyst and a synthesis method thereof. The catalyst is pure-phase hexagonal close-packed (hcp) crystal cobalt oxide supported on a carrier. Background technique [0002] Fischer-Tropsch synthesis is the synthesis gas (H 2 +CO) is an important technology for catalytic conversion into chemicals and fuels under certain conditions, and is a key technology for replacing fossil energy in the production of fuel oil and high-value chemicals in the future. Compared with iron catalysts, cobalt-based catalysts have the advantages of higher activity, higher selectivity to heavy hydrocarbons and longer lifetime, and thus become one of the most important catalysts in industry. In cobalt-based Fischer-Tropsch synthesis catalysis, elemental cobalt is the only active phase, and the elemental cobalt obtained by the reduction o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75B01J35/02C10G2/00B01J35/00
CPCC10G2/331B01J23/75B01J35/40
Inventor 王立吕帅李金林张煜华
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES