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Volume 5, Issue 3 (Suppl)
Mod Chem Appl, an open access journal
ISSN: 2329-6798
Global Chemistry 2017
September 04-06, 2017
September 04-06, 2017 | London, UK
5
th
Global Chemistry Congress
Mod Chem Appl 2017, 5:3(Suppl)
DOI: 10.4172/2329-6798-C1-006
The influenceofpreparationmethodsonhalloysitenanotubes supportedNi catalysts forhydrogenation
of benzene
Noor Hana Hanif Abu Bakar, F Yusli, W L Tan
and
M Abu Bakar
Universiti Sains Malaysia, Malaysia
A
series of halloysite nanotubes supported nickel catalysts (Ni-HNT) were prepared using classical (C) and non-classical
(NC) methods via impregnation technique. The Ni content was varied between 2-14 wt %. Catalysts were characterized
via Atomic Absorption Spectroscopy (AAS). The catalysts prepared via NC methods contained a lower amount of Ni species.
Furthermore, electron microscopy images showed that although the Ni species were scattered with some agglomeration in
both the C and NC catalysts, the Ni species were more aggregated in the NC catalysts. These occurrences are attributed to the
preparation method employed and is related to the mobility of the Ni species during preparation of the catalysts. The surfaces
of the catalysts were characterized using Hydrogen Temperature-Programmed Desorption (H
2
-TPD), Hydrogen Temperature-
Programmed Reduction (H
2
-TPR) and H
2
Chemisorption techniques. The H
2
-TPR analysis demonstrated the availability of
bulk NiO species in the C catalysts while surface oxides were available in the NC catalysts. H
2
-chemisorption studies indicated
that the total surface area of the Ni active phase in the C catalysts were larger than the NC catalysts. Even so, the H
2
-TPD
analyses reveal that different active sites were available in the C and NC catalysts. These different active sites influenced the
catalytic reactivity of the catalysts. The catalysts prepared using the NC method showed high amounts of H
2
spillover. In
addition, the 7.7 wt% Ni-HNT/NC catalysts exhibited additional active sites and the largest amount of desorbed H
2
. This
resulted in the better catalytic reactivity for the hydrogenation of benzene to cyclohexane when compared to the C catalysts.
hana_hanif@usm.my