Hydroisomerization
of long chain n-alkanes has
been playing an important role in the petroleum industry, in which
heavy distillate and residue are converted into value-added products
such as gasoline, jet fuel, other middle distillates and lubricant
oils. Herein, 10-ring zeolites, including ZSM-22, ZSM-23, ZSM-35,
and ZSM-48 were studied for the process. ZSM-35 and ZSM-48 are relatively
less studied zeolites as hydroisomerization reaction catalysts though
they are expected to display interesting shape selective properties.
A higher conversion was obtained over Pt-ZSM-35 and a higher selectivity
was obtained over Pt-ZSM-23 at low temperature and short contact time,
and a higher selectivity was obtained over Pt-ZSM-48 at high temperature
and long contact time, while the mixed catalysts displayed interesting
conversion and selectivity. Small differences in the channel system
have a notable influence on the product distribution of hexadecane
hydroisomerization over 10-ring zeolites. A combination of the evidence
of no absence of multibranched products and the length of hexadecane
molecular could infer that hexadecane hydroisomerization includes
a pore mouth reaction mechanism.
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