The behavior of methoxy species on dimethyl ether (DME) adsorbed CeO 2 was investigated using temperatureprogrammed desorption (TPD) and infrared (IR) spectroscopy. TPD experiments showed that the thermal desorption peaks at 470-500 and 570 K are all DME from DME/CeO 2 adsorbed at 300 K. These DME desorptions are attributed to the recombination of the surface methoxy species on CeO 2 . IR spectra of DMEadsorbed CeO 2 showed two bands at 1158 and 1070 cm -1 at 300 K. These bands were assigned to the C-O stretching (ν(CO)) bands of surface methoxy species bound to one Ce ion (terminal-OCH 3 ) and two Ce ions (bridged-OCH 3 ), respectively. These bands decreased with increasing the temperature of CeO 2 . The increase of the temperature to 490 K led to the appearance of a new band at 1025 cm -1 which was identified as ν(CO) of µ-OCH 3 bound to more than three Ce ions. The TPD and IR results suggest that only the µ-OCH 3 is decomposed into carbonate via a formate intermediate. The reactions of surface methoxy species on CeO 2 are discussed.
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