25-27 November 2015
National Centre for Synchrotron Science
Australia/Melbourne timezone

Formation of CeO2 in CeTiO2 catalyst studied by the in situ XANES

26 Nov 2015, 13:30
Exhibition space (National Centre for Synchrotron Science)

Exhibition space

National Centre for Synchrotron Science

Australian Synchrotron 800 Blackburn Road Clayton VIC 3168
Board: EM-09
Poster Energy Materials Poster Session 1


Dr Yingyot Poo-arporn (Synchrotron Light Research Institute)


Cerium-doped titanium dioxide was prepared by a sol-gel method using Titanium(IV)-isopropoxide and Ce(NO3)3•6H2O as the Ti and Ce precursors. X-ray absorption near edge structure (XANES) measurement was performed on the time-resolved XAS (Bonn-SUT-SLRI) beamline at Synchrotron Light Research Institute, Thailand. The beamline employs an energy dispersive monochromator and the position sensitive detector to record an XANES spectrum. For as prepared Ce/TiO2, XANES spectra show mainly the characteristic peaks due to the Ce3+. To monitor transition mechanism between Ce3+ and Ce4+ in Ce/TiO2, the in situ XANES measurements were performed. Ce L3-edge XANES spectra were recorded in 5 K intervals from 573 K to 823 K. Each spectrum was recorded at 250 ms with the averaging of 10 scans. At temperature lower than 763, there was no significant changes of whiteline peak. Two peaks corresponding to the CeO2 were clearly observed at 808 K. Although the calcinations temperature was increased to 823 K, there was no significant change in Ce L3-edge XANES spectra. This result indicated the sufficient temperature for CeO2 formation.
Keywords Ce/TiO2, in situ XANES

Primary author

Dr Yingyot Poo-arporn (Synchrotron Light Research Institute)

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