TITLE:
N-Hexane Isomerization on Ni-Pt/Catalysts Supported on Mordenite
AUTHORS:
Geovana S. V. Martins, Everton R. F. dos Santos, Meiry G. F. Rodrigues, Gina Pecchi, Carlos M. N. Yoshioka, Dilson Cardoso
KEYWORDS:
N-Hexane; Isomerization; Mordenite; Nickel; Platinum
JOURNAL NAME:
Modern Research in Catalysis,
Vol.2 No.4,
October
8,
2013
ABSTRACT:
The aim of this work was to evaluate the catalytic
properties for n-hexane isomerization of bifunctional monometallic (Ni or Pt) and
bimetallic catalysts (Pt-Ni), using HMOR zeolite as support. The method used
for metal dispersion in the zeolite was competitive ion exchange using ammine
complexes [Ni(NH3)6]Cl2 and [Pt(NH3)4]Cl2 as precursors. The catalysts were characterized by X-Ray diffraction, X-Ray
energy dispersion spectroscopy, temperature-programmed reduction
and transmission electron microscopy. The n-hexane isomerization reaction using
the catalysts was carried out to evaluate the catalyst activity. The reaction was
carried out in a fixed bed reactor operating at 250?C, 1 atm, H2/C6 = 9 molar ratio. The profiles obtained from TPR suggest that, for bimetallic
catalysts, the presence of platinum facilitates the reduction of Ni2+ cations. The bimetallic catalysts presented a higher activity in the isomerization
of n-hexane when compared to the monometallic ones, as well better stability as
the Pt content in the solid increases.