Preparation And Fischer-Tropsch Estimation Of Bridging Complexes Of Cobalt Cluster And Lanthanide

In this paper, bridging complexes, which can be used as the precursor of F-T synthesis, contain both cobalt carbonyl cluster and lanthanide were designed to use as the precursor of F-T synthesis reation. First, Tetrahedron-cobalt carbonyl cluster with carboxyl was synthesized use Co₂(CO)₈ as the raw material, the cluster was used to react with lanthanide (La, Ce, Sm and Yb) trifluoroacetate to construct bridging complexes. Then, a series of catalysts were prepared by impregnating the complexes synthesized above onγ-Al₂O₃ support for the first time, and F-T catalytic performance was evaluated. Concrete work as follows:1. Cluster (CO)₉Co₃ [μ₃-CC₆H₄(CH₂)₂COOH] was used to react with lanthanide (La, Ce, Sm and Yb) trifluoroacetate respectively, and a series of bridging complexes contain lanthanide and cobalt cluster were synthesized and characterized by IR,ICP,C/H element analysis and thermal analysis, after comparing the bridging complexes with a similar structure complex that has already been synthesized in our lab,the structure of the complexes were speculated as: two lanthanide atom were bridged by four CF₃COO^-, cobalt carbonyl cluster and THF were coordinated to the lanthanide atom to form a steady structure. Since these complexes' crystallization condition difficult to control, crystal training work remains to be further explored.2. A series of catalysts were prepared by impregnating the complexes synthesized onγ-Al₂O₃ support, and characterized by surface area analysis (BET), and thermal analysis (TGA). The catalytic performance for F-T synthesis was tested, following are results:Using complexes precursors such as the cobalt carbonyl cluster and lanthanide bridging complexes resulted in a significant increase of cobalt dispersion in comparison with catalyst in the reference made from cobalt nitrate, but less activity.