Correlated Atomic Resolution Microscopy and Spectroscopy Studies of Sn(Sb)O2 Nanophase Catalysts

摘要: Abstract A series of antimony-doped tin oxide (ATO), Sn(Sb)O 2 , nanophase catalysts (containing 43 mol% Sb calcined at temperatures 250, 600, and 1000°C, respectively) have been studied by correlated electron energy-loss spectroscopy (EELS) Z -contrast imaging in a scanning transmission microscope (STEM) high-resolution microscopy (HREM). As reference materials, pure SnO O 3 5 are also analyzed. Results show that the particle size these ATO increases with calcination temperature. At low temperatures, catalyst contains crystalline nanoparticles surrounded amorphous material, while become well crystallized when higher temperatures. EEL spectra acquired from qualitatively interpreted using ‘fingerprints’ materials. suggest (250°C), exists pentavalent state (V) either incorporated into lattice or as an layer surrounding crystals. (≥600°C), segregation occurs trivalent (III) surface core majority nanoparticles. However, it should be noted nearly no was detected some particles. The ions proposed active sites catalysts.