Abstract
We compare the autothermal partial oxidation of 1-propanol and 2-propanol
with methanol and ethanol on Rh with several additives in short-contact
time reactors. All alcohols could produce H2 at 70-90% selectivity,
and Rh-Ce was superior to Rh in producing H2. Methanol produced high
conversion and high selectivity to H2 even at high C/O where temperatures
fell to 2 and CO than the other alcohols, but produced the most chemicals.
Above C/O = 1.5, ~70% of 2-propanol was converted into acetone or
propylene. Up to 20% propylene was formed at C/O = 1.5. In contrast,
1-propanol gave 2 and CO. Our results suggest that acetone and olefins
likely were produced primarily by homogeneous reactions after all
O2 had been consumed in the catalyst. Although alkanes do not form
significant oxygenates by partial oxidation at short contact times,
alcohols can be made to produce predominantly oxygenates through
suitable adjustments of C/O and catalyst.
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