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Treatment method for improving activity and dispersity of active components in cobalt-based catalyst for Fischer-Tropsch synthesis

A technology of cobalt-based catalysts and active components, applied in chemical instruments and methods, catalyst activation/preparation, physical/chemical process catalysts, etc., can solve problems such as redispersion of cobalt particles that are rarely considered, to avoid rapid deactivation, The method is simple and easy, and the effect of prolonging life

Active Publication Date: 2016-09-21
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, little consideration has been given to the redispersion of cobalt particles in the catalyst after calcination to promote the activity of the catalyst.

Method used

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  • Treatment method for improving activity and dispersity of active components in cobalt-based catalyst for Fischer-Tropsch synthesis
  • Treatment method for improving activity and dispersity of active components in cobalt-based catalyst for Fischer-Tropsch synthesis
  • Treatment method for improving activity and dispersity of active components in cobalt-based catalyst for Fischer-Tropsch synthesis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Take Co(NO 3 ) 2 20wt% Co / SiO prepared as cobalt precursor and prepared by equal volume method 2 Catalyst (calcined at 500°C in air for 5h, 40-60 mesh) 1g, mixed evenly with 2g of quartz sand, filled into a pressurized fixed-bed reactor, and reduced in hydrogen (30mL / min, 0.1MPa) at 500°C for 5h And then lower the temperature to 300°C in air (30mL / min, 0.1MPa) for 5h reduction oxidation cycle, and then reduce the treatment in hydrogen at 300°C for 5h, and finally lower the temperature to 230°C and introduce hydrogen to carbon monoxide with a molar ratio of 2 of synthesis gas, the pressure was adjusted to 1.0MPa, the space velocity was 4500mL / g / h, and the Fischer-Tropsch synthesis reaction was carried out. The reaction results are shown in Table 1. Co / SiO after firing 2 The XRD of the catalyst samples after and without reduction and oxidation treatment can be seen figure 2 .

Embodiment 2

[0020] Take Co(NO 3 ) 2 20wt% Co / SiO prepared as cobalt precursor and prepared by equal volume method 2 Catalyst (calcined at 500°C in air for 5h, 40-60 mesh) 1g, mixed evenly with 2g of quartz sand, filled into a pressurized fixed-bed reactor, and reduced in hydrogen (30mL / min, 0.1MPa) at 500°C for 5h And then lower the temperature to 300°C in air (30mL / min, 0.1MPa) for 5h reduction oxidation cycle twice, then reduce the treatment in hydrogen at 300°C for 5h, and finally lower the temperature to 230°C and introduce hydrogen to carbon monoxide with a molar ratio of 2 of synthesis gas, the pressure was adjusted to 1.0MPa, the space velocity was 4500mL / g / h, and the Fischer-Tropsch synthesis reaction was carried out. The reaction results are shown in Table 1.

Embodiment 3

[0022] Take Co(NO 3 ) 2 20wt% Co / Al prepared by equal volume method as cobalt precursor 2 o 3 Catalyst (calcined at 500°C in air for 5h, 40-60 mesh) 1g, mixed evenly with 2g of quartz sand, filled into a pressurized fixed-bed reactor, and reduced in hydrogen (30mL / min, 0.1MPa) at 500°C for 5h And then lower the temperature to 300°C in air (30mL / min, 0.1MPa) for 5h reduction oxidation cycle, and then reduce the treatment in hydrogen at 300°C for 5h, and finally lower the temperature to 230°C and introduce hydrogen to carbon monoxide with a molar ratio of 2 of synthesis gas, the pressure was adjusted to 1.0MPa, the space velocity was 4500mL / g / h, and the Fischer-Tropsch synthesis reaction was carried out. The reaction results are shown in Table 1. Co / Al after firing 2 o 3 H 2 -TPR curve see image 3 .

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Abstract

The invention discloses a treatment method for improving activity and dispersity of active components in a cobalt-based catalyst for Fischer-Tropsch synthesis. By repeated reduction oxidation or oxidation reduction of calcined cobalt-based catalyst, dispersity of cobalt particles on the surface of a carrier can be improved. Reduction conditions in the method include: a reduction atmosphere is an atmosphere of hydrogen or mixture of hydrogen and other gases, a temperature is 200-750DEG C, a pressure is 0.1-4.0MPa, duration is 0.5-48h, and an air speed is 1000-30000mL / g / h. Oxidation conditions include: an oxidation atmosphere is an atmosphere of air or mixture of oxygen and other gases, a temperature is 200-750DEG C, a pressure is 0.1-3.0MPa, duration is 0.5-48h, and an air speed is 1000-30000mL / g / h. Compared with an untreated catalyst, the treated catalyst has advantages that CO conversion rate and higher hydrocarbon yield can be evidently increased, and catalyst stability can be improved.

Description

technical field [0001] The invention belongs to the technical field of synthesis gas conversion, in particular to a treatment method for improving the dispersion and activity of active components in cobalt-based catalysts for Fischer-Tropsch synthesis. Background technique [0002] In recent years, with the gradual depletion of oil resources, the search for alternative energy has become a national strategic issue. my country is rich in coal resources, and the development of the coal-to-synthesis gas-to-oil chemical industry is of great significance for alleviating the contradiction between my country's oil supply and demand and realizing the clean utilization of coal. At the same time, it has broad market development prospects. This is also one of the important ways to ensure my country's energy security. Taking carbon monoxide and hydrogen as the main components of synthesis gas as raw materials, using catalysts to obtain clean hydrocarbon fuels through Fischer-Tropsch synt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01J23/75C10G2/00
CPCC10G2/33B01J23/75B01J37/14B01J37/18C10G2300/70B01J35/394B01J35/393
Inventor 刘小浩胥月兵蔡健
Owner JIANGNAN UNIV
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