Endothermic Reforming of <i>n</i>‑Hexane
on Metal (Pt, Ga) Containing H‑ZSM‑5 at High Pressures
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Abstract
The
supercritical, high-pressure reaction of <i>n</i>-hexane
over H-ZSM-5, with and without the addition of Pt and Ga,
has been studied for application to endothermic reforming in scramjet
engines. The endothermicities of the reactions were determined from
the product distributions. For unpromoted H-ZSM-5, the product distribution
indicated that the endothermicity is low and decreases with increasing
pressure. The addition of Ga to H-ZSM-5 has a relatively small effect
on <i>n</i>-hexane conversion but significantly increases
the endothermicity of the reaction by increasing the selectivity to
form small aromatics. The H(Ga)-ZSM-5 catalyst showed no deactivation
for at least 5 h at 633 K and 137 bar of <i>n</i>-hexane.
By contrast, the addition of Pt had a minor effect on both the rate
and the reaction endothermicity