Preparation and Fischer-Tropsch Estimation of Bridging Complexes of Cobalt Cluster and Lanthanide

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 strong magnets 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 http://www.chinamagnets.biz/ 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.