Synthesis And Catalytic Properties Of Pervoskite-related Niobate Intercalation Compounds

The layered compounds can accommodate a diversity of organic functional guestcompounds due to their unique layered structure and ion exchange capacity while maintainingtheir structural features unalterable. The perovskite niobate compounds are alllayered-structured such as KCa2Nb3O10and KLaNb2O7. A substantial number of functionalorganic compounds can be inserted into the layer compounds by ion exchange method, whichmakes the layered compounds attractive in a variety of fields, such as catalysis, optics devices,biosensor and molecular recognition, etc.KCa2Nb3O10and KLaNb2O7were chosen as the research objects, the preparation processand their catalytic properties were studies, The follows are the main conclusions:1. The layered compounds (KCa2Nb3O10, KLaNb2O7) were synthesized by solid statemethod and characterized by X-ray diffraction, IR, SEM.2. The water-soluble manganese porphyrins cation (MnTMPyP), Ru(bpy)32+and MB+havebeen successfully inserted into the interlayer spacing of KCa2Nb3O10by guest-guestion-exchange method. The structure, morphology and properties of the intercalation compoundsare characterized by X-ray diffraction, IR, SEM, UV-vis, etc.3. The Ru(bpy)32+-LaNb2O7was prepared by guest-guest ion exchange method byadopting the intercalation compound PrNH3+-LaNb2O7as a precursor, and which wascharacterized by XRD, IR, SEM,UV-vis, etc.4. The catalytic performance of MnTMPyP-Ca2Nb3O10, Ru(bpy)32+-Ca2Nb3O10,Ru(bpy)32+-LaNb2O7for the epoxidation of cyclohexene with dioxygen as oxidant,isobutylaldehyde as co-reductant was investigated. The intercalation compounds showed highlycatalytic activity and selectivity. And these catalysts retained their catalytic activity during thereaction and were reused five times without signifcant loss of catalytic activity.5. The MB-Ca2Nb3O10modified electrode was fabricated by simple dip-coating method.The electrochemical behaviors of the modified electrodes were investigated by cyclicvoltammogram (CV) and Pulse voltammetry in phosphate buffer solution (PBS), which exhibitexcellent electrocatalytic activity to ascorbic acid.