A cobalt-based fischer-tropsch synthesis catalyst, its preparation method and use

By using a lignin-semi-coke composite continuous carbon framework support and nickel-catalyzed in-situ hydrodesulfurization, a cobalt-based Fischer-Tropsch synthesis catalyst with high thermal conductivity and high strength was prepared. This solved the problems of sulfur poisoning, insufficient mechanical strength, metal sintering and thermal management difficulties of cobalt-based catalysts, and achieved high selectivity and long lifespan of the catalyst.

CN122321867APending Publication Date: 2026-07-03QINGSONG YIJIA (BEIJING) ENVIRONMENTAL PROTECTION ENERGY TECHNOLOGY CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
QINGSONG YIJIA (BEIJING) ENVIRONMENTAL PROTECTION ENERGY TECHNOLOGY CO LTD
Filing Date
2026-05-25
Publication Date
2026-07-03

AI Technical Summary

Technical Problem

Existing cobalt-based Fischer-Tropsch synthesis catalysts face technical challenges such as sulfur poisoning, insufficient mechanical strength of the support, metal sintering deactivation, difficulty in thermal management, and organic acid corrosion, which limit their application in coal-based syngas.

Method used

Using a lignin-semi-coke composite continuous carbon framework as a support, a cobalt-based Fischer-Tropsch synthesis catalyst with high thermal conductivity and high strength was prepared by loading cobalt through nickel-catalyzed in-situ hydrodesulfurization and solvent circulation vacuum-pressure impregnation, combined with CaO to neutralize organic acids.

Benefits of technology

It significantly improves the selectivity and stability of catalysts, extends catalyst life, and is suitable for fixed-bed and fluidized-bed reactors, solving problems such as high sulfur content, interference from nickel cracking activity, poor thermal conductivity of traditional supports, and corrosion by organic acids.

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Abstract

This invention discloses a cobalt-based Fischer-Tropsch synthesis catalyst, its preparation method, and its application. The catalyst uses porous carbon framework particles as a support and, based on the total weight of the catalyst, comprises: 70%-85% carbon framework support, 10%-20% cobalt active component, 1%-2% NiO, and 3%-8% CaO. The achieved technical effects are as follows: by employing a porous carbon framework support with high thermal conductivity and high strength, the reaction hotspot temperature can be reduced by more than 50°C, effectively inhibiting cobalt particle sintering and extending the catalyst life by 2-3 times; the continuous, integrally formed carbon framework has a lateral compressive strength >80 N and a wear rate <2%, making it stable for use in fluidized bed reactors; and the introduction of CaO alkaline sites allows for the neutralization of organic acids, reducing the cobalt loss rate from 12% in traditional processes to below 3%, further extending the catalyst life by 30%-50%, significantly improving the catalyst's selectivity, stability, and service life.
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