Abstract
Abstract Nano-sized (4–5 nm) crystallites of CeO 2 and CeLnOx mixed oxides (Ln = Pr, Tb, Lu; Ce/Ln atomic ratio 5/1) with narrow size distribution were prepared by a microemulsion method (W/O). Structure, morphology and reducibility of the samples annealed up to 950 °C in oxygen were analyzed by HRTEM, XRD, Raman spectroscopy and H 2 -TPR. Obtained mixed oxides exhibited fluorite structure of CeO 2 , and no phase separation occurred upon heating up to 950 °C. Both XRD and TEM revealed that severe sintering of CeO 2 at high temperatures could be effectively hampered by addition of second lanthanide. HRTEM results showed that the nanocrystallites exhibited irregular shapes exposing mostly {1 1 1} faces, though small amount {1 0 0} faces was also observed. No distinguishable change in morphology of the particles could be detected with temperature increasing from 800 to 950 °C.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
