Abstract
The catalytic partial oxidation of n-decane and n-hexadecane with
air over a Rh-coated monolith produces synthesis gas (H2 and CO)
in selectivities exceeding 80%, with > 99% conversion of fuels and
100% conversion of oxygen at catalyst contact times from 5 to 25
ms. The high boiling hydrocarbons were delivered as liquids using
an automotive fuel injector into a heated chamber where they vaporized
in the presence of air. This system creates temperature and concentration
gradients that allow safe mixing of fuel with air at temperatures
above the autoignition of the fuel. Fuel-rich feeds beyond the syngas
ratio produced olefins with selectivities as high as 80% in the case
of n-hexadecane. The distribution of these olefins goes from primarily
ethylene to large alpha-olefins as oxygen feed is decreased. Partial
oxidation of low sulfur diesel fuel was also carried out successfully,
producing synthesis gas at > 98% fuel conversion with several hours
of stable operation.
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