Abstract
The partial oxidation of n-decane to produce H2, ethylene, and alpha-olefins
has been compared over Rh and Pt in autothermal reactors at short
contact times. Over Rh it is shown that the addition of an alumina
wash coat and small foam pore size give higher H2 selectivity (>85%),
while the absence of wash coat and larger pore size give more olefins
(up to 60%). In contrast, Pt is unsatisfactory for producing either
H2 or olefins because the conversion of both n-decane and O2 is lower.
Pt produces essentially no H2 (2. We interpret these results as caused
by the high activity of Rh that removes all O2 early in the catalyst,
leaving homogeneous pyrolysis to produce olefins. The lower activity
of Pt appears to be caused by its inability to completely dissociate
n-decane, leaving fragments on the surface that inhibit reaction
and produce a less active surface.
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