The Heterogenation Of Tetrakis(O-Chlorophenyl) Porphyrin Metal Complexes And Their Catalytic Activities In The Liquid Phase Oxidation Of Benzyl Alcohol
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Date
2014-02
Authors
Ooi, Wan Ting
Journal Title
Journal ISSN
Volume Title
Publisher
Universiti Sains Malaysia
Abstract
Heterogenation of porhyrin metal complexes were effected by immobilizing
onto inorganic silica support from rice husk ash via 3-aminopropyltriethoxysilane
(APTES). These catalysts were denoted as RHAC-CoPor and RHAC-NiPor. These
insoluble mesoporous hybrid materials, RHAC-CoPor and RHAC-NiPor showed
high specific surface area of 114 m2g-1 and 190 m2g-1, respectively. The prepared
catalysts possessed a narrow pore size distribution centered at around 4.17 nm for
RHAC-CoPor and 4.90 nm for RHAC-NiPor. The 13C CP/MAS NMR showed the
catalysts had three chemical shifts in the range of 12 – 47 ppm consistent with the
three carbon atoms of the propyl group, and a series of chemical shifts in the range of
δ = 100 - 170 ppm consistent with the presence of the porphyrin metal complexes.
Elemental analysis showed the successful immobilization of the porphyrin metal
complexes onto functionalized silica support. Their catalytic activities were tested in
the liquid phase oxidation of benzyl alcohol with the green oxidant, H2O2. RHACCoPor
exhibited excellent catalytic activity when used for the oxidation of benzyl
alcohol. The reaction resulted in a benzyl alcohol conversion of 97.1 % and 97.7 %
selectivity towards benzaldehyde under ambient temperature of 343 K with 80 mg of
catalyst and 1:1.5 molar ratio of reactant over 5 h.
Description
Keywords
Tetrakis(O-Chlorophenyl) Porphyrin , Benzyl Alcohol