| Summary: | 碩士 === 國防大學理工學院 === 應用化學碩士班 === 97 === The reaction of ethanol (C2H5OH) on Co3O4, 10La/Co3O4 and 20Ce/Co3O4 surface had been investigated by the combined techniques of temperature programmed desorption-mass spectroscopy (TPD-MS) and in situ Fourier transform infrared (in situ FTIR). Three reforming pathways on DE (decomposition of ethanol), POE (partial oxidation of ethanol) and SRE (steam reforming of ethanol) had been derived. The results showed that the adsorption of ethanol over catalyst surface proceeds via an ethoxide (C2H5O) intermediate. Acetaldehyde (CH3CHO) formed firstly by the oxidative dehydrogenation of ethoxide species for the DE pathways, while, the acetate (CH3COO) intermediate formed on both POE and SRE reaction. Except the CH4 and CO2 formed by cracking C－C bond of acetaldehyde or acetate intermediates for all pathways. Temperature on the decomposition of C－C bond (DT) varies with reforming pathways. The DE reaction has lower DT than the POE and SRE reactions. Formation of carbon dioxide (CO2) on the DE reaction was attributed to the oxidation of CO by the lattice oxygen of catalyst. According to the results, the
mechanism of reforming of ethanol was derived in this study.
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