Abstract
Steam addition to the catalytic partial oxidation of n-decane and
n-hexadecane with air over Rh-coated monoliths at millisecond contact
times produces considerably higher H2 and CO2 and lower olefin and
CO selectivities than without steam addition. For steam to carbon
feed ratios from 0.0 to 4.0, the reactor operated autothermally,
and the H2 to CO product ratio increased from ~1.0 to ~4.0, which
is essentially the equilibrium product composition near synthesis
gas stoichiometry (C/O ~1) at contact times of ~7 ms. In fuel-rich
feeds exceeding the synthesis gas ratio (C/O > 1), steam addition
suppressed olefins and promoted synthesis gas and water-gas shift
products. Steam addition also reduced catalyst surface carbon. Furthermore,
steam addition to the catalytic partial oxidation of the military
fuel JP-8 was performed successfully, also increasing H2 and suppressing
olefins.
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