Background: To prevent the environmental pollution, the release of the carcinogenic
reagents like nitroarenes, especially nitrobenzene must be reduced or to find a way to convert these
hazardous materials into less harmful material. For the reduction of nitroarenes, various types of
catalysts such as metal nanoparticles (mainly coinage and group VIII) and platinum group metals were
used. The chemo/homo selectivity of the reduction of nitroarenes was tested mainly in an organic
Method: Trimetallic oxide nanocatalysts were prepared chemically and characterized via Thermogravimetric
analysis (TGA), X-ray diffraction (XRD), Fourier transform infrared spectroscopy
Scanning electron microscope (SEM) and solid UV studied. A series of nitroarenes were subjected to
get their amine analogues using the NaBH4 in an aqueous medium using the synthesized catalysts. The
completion of the reduction process was confirmed by the spectroscopic analysis.
Results: The average crystallite of the trimetallic oxide nanocatalysts was found to be 14-32nm. The
reductions were selective (homo/chemo) and kinetics followed the Lindemann-Hinshelwood pseudofirst
order kinetics with the rate constant in the order of 10-3 s-1. Hydroxylamine intermediate was
found to be formed in the reduction procedure.
Conclusion: The catalysts showed promising for the selectivity (homo/chemo). The reduction processes
were less time consuming e.g. nitrobenzene took 10 mins and a series of nitroanilines required
35-40 s for the reduction. In short, the trimetallic nano-oxide catalysts possess fast reaction process,
cost-effective, easy to handle, reusable and hence could be promising for industrial waste treatment.
Keywords: Nano-catalyst, Heterogeneous catalysis, Nitro compounds, Homo/chemo selectivity, Reaction mechanism
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