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| - Thermal Conversion of Methoxy Species on Dimethyl Ether Adsorbed CeO2
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| - The behavior of methoxy species on dimethyl ether (DME) adsorbedCeO2 was investigated using temperature-programmed desorption (TPD) and infrared (IR) spectroscopy. TPDexperiments showed that the thermaldesorption peaks at 470−500 and 570 K are all DME fromDME/CeO2 adsorbed at 300 K. These DMEdesorptions are attributed to the recombination of the surface methoxyspecies on CeO2. IR spectra of DME-adsorbed CeO2 showed two bands at 1158 and 1070cm-1 at 300 K. These bands were assignedto the C−Ostretching (ν(CO)) bands of surface methoxy species bound to oneCe ion (terminal-OCH3) and two Ce ions(bridged-OCH3), respectively. These bands decreasedwith increasing the temperature of CeO2. Theincreaseof the temperature to 490 K led to the appearance of a new band at 1025cm-1 which was identified asν(CO)of μ-OCH3 bound to more than three Ce ions. The TPDand IR results suggest that only the μ-OCH3isdecomposed into carbonate via a formate intermediate. Thereactions of surface methoxy species on CeO2are discussed.
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