Study On Highly Dispersed Nano-Metal Catalysts And Performances By Reducing Perovskite-Type Oxides

Owing to the energy structural characteristics in our country,direct ethanol synthesis from coal or biomass via syngas has important strategic significance and potential applications prospect.Low-temperature CO oxidation can be used not only for air purification,closed-cycle carbon dioxide lasers and automotive emissions,but also for the catalysts of performance test over probe reaction,which has important theoretical and practical research significance.The catalytic performances of copper-cobalt catalysts for direct ethanol synthesis from syngas were determined by the structure and composition of bi-metallic Cu-Co.The perovskite-type composite oxide of La_0.95Ce_0.05Co_0.7Cu_0.3O₃ supported on Zr O₂was prepared via an incipient wetness impregnation combing citrate complexing method.The reduced catalysts were used in the direct ethanol synthesis from syngas and explored the influence of loading,space velocity and pressure and characterized by using XRD,BET,H₂-TPR and TEM techniques.The results showed that the active components in the catalyst were in forms of Cu-Co alloy and Cu-Co alloy were highly dispersed on the surface of Zr O₂,while La-Ce-O was in forms of composite oxide.The relationship between characterization and performance was analyzed to explore the influence of catalyst structure on performance.A series of different Fe-Co ratio perovskite precursors,La Fe_0.9-xCo_xPt_0.1O₃/Si O₂,were prepared via an incipient wetness impregnation combing citrate complexing method.Pt/La Fe_1-xCo_xO₃/Si O₂-La₂O₃ and Co-Pt/La Fe O₃/Si O₂-La₂O₃ were formed after reduction at low temperature and high temperature.The oxidation performance of CO after reduction at different temperatures was tested to further explore the influence of catalyst structure on the performance.