Nickel Porphyrin Hybrid Material Based on Functionalised Silica for the Selective Oxidation of Benzyl Alcohol


Metalloporhyrin ligand, [tetrakis(o-chlorophenyl)porphyrinato]Ni(II) was successfully immobilised onto inorganic silica support from rice husk ash via 3-aminoprorplytriethoxysilane (APTES) and the resulting catalyst was labeled RHAC-NiPor. This mesoporous organic-inorganic hybrid catalyst showed a high specific surface area of 190.0 m2 g–1. The 29Si MAS NMR solid-state spectrum showed the presence of Q4, Q3, T3 and T2 silicon centres in RHAC-NiPor. The catalyst exhibited a good catalytic activity when used as a catalyst for the oxidation of benzyl alcohol with H2O2. A high selectivity to the desired product (benzaldehyde) of 100% and a maximum benzyl alcohol conversion of 54.9% was achieved. RHAC-NiPor could be reused several times without losing its catalytic activity.


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