| Perovskite-type oxides have attracted particularly attentions because of their special applications in environmental protection and energy resource. Due to their remarkable stability, perovskite-type oxides can accommodate a large number of metal and. non-metal elements through substituting A or B site of ABO3. Furthermore, perovskite-type oxides can produce the abnormal valence of ions in B site, A site vacancies and oxygen vacancies, which result in the obtained samples possessing special physical and chemical character, and the improvement of decomposing NO to N2In this dissertation, a series of perovskite-type oxides via substituting the A or B site of La(Ba)CoO3 were successfully synthesized through citric acid complexing sol-gel method. The presented samples were characterized in detail by thermogravimetric-differential thermal analysis (TG-DTA), infrared spectra (IR), X-ray diffraction (XRD), O2 temperature programmed desorption (O2-TPD), H2 temperature programmed reduction (H2-TPR), X-ray photoelectron spectroscopy (XPS), and N2 adsorption. The influence of doping elements in A site and B site and the doping ratio on the catalytic activity of perovskite-type oxides was also respectively discussed in this thesis.A great deal of perovskite-type oxides catalysts power samples (La0.8Ba0.2Co1-xFexO3, et al.) were presented in this dissertation. The conversion of 1.0% NO to nitrogen over these catalysts can reach perovskite phase is simple at low Ba content. O2-TPD conclusions reveal that the... |
PDF Full Text Request