On the problem of cobalt chloride-based catalysts in the Fischer Tropsch synthesis

Madita Einemann; Simon Haida; Nico Fischer

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On the problem of cobalt chloride-based catalysts in the Fischer Tropsch synthesis

机译：On the problem of cobalt chloride-based catalysts in the Fischer Tropsch synthesis

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The role of cobalt chloride hexahydrate as a precursor of cobalt bulk catalysts for the Fischer-Tropsch reaction was studied. Applying in situ DRIFTS, in situ XANES, in situ XRD and inverse TPR, different oxygen containing cobalt compounds were detected depending on the applied parameters. Considering the different geometries of the measuring cells, the role of back mixing in the reaction network of the transformation of cobalt chloride was discussed. It was shown that only the complete removal of crystal water up to 100 °C avoids the formation of oxygen containing cobalt compounds. A reaction network was proposed to describe the transformation of cobalt chloride. The reduction of calcined cobalt chloride proceeds as a single step in the temperature range of 400-600 °C. Nitrate-based catalysts are reduced between 250 and 500 °C. The comparison of the bulk cobalt catalysts prepared either with cobalt nitrate or cobalt chloride showed a strong influence on the degree of conversion in the Fischer-Tropsch reaction. The difference in activity was explained in terms of residual chloride ions on the catalyst surface. Consequently, the activation procedure of the cobalt chloride-based catalysts must be chosen carefully to force the formation of cobalt oxide.

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《Catalysis science & technology》 |2023年第15期|4409-4419|共11页
作者
Madita Einemann; Simon Haida; Nico Fischer;
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Carl v. Ossietzky University of Oldenburg, Institute of Chemistry, Industrial Chemistry 2, D-26111 Oldenburg, Germany;

Catalysis Institute and c*change (DSI-NRF Centre of Excellence in Catalysis), Department of Chemical Engineering, University of Cape Town, 7701 Cape Town, South Africa;

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正文语种英语
中图分类物理化学（理论化学）、化学物理学;
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On the problem of cobalt chloride-based catalysts in the Fischer Tropsch synthesis

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