1. Their characterization data
showed both Pt and Re to exist as separate active species over the
support, although with possibility of synergic interaction. The
reaction products were mainly n-C15 to n-C18 alkanes, with the
concentration being much dependent on the ratio of oil to catalyst.
At the initial ratio of 1, the n-alkanes yield reaches 80% but decayed
to only 2.3% when the ratio was further raised to 10. However, the
synergic effect slightly retards the decay process. Similarly, the
reaction mechanism over these metal sites was consistent with