Abstract
Palladium–Cobalt (Pd–Co) alloys with different atomic ratios were synthesized successfully by borohydride-assisted chemical reduction method. Pd–Co alloys were characterized to study their physical and chemical properties. Further, the catalytic behavior of the synthesized alloys and effect of cobalt inclusion into alloy for the catalytic behavior was studied using reduction of 4-nitrophenol (4-NP). The reduction of 4-NP into 4-aminophenol by sodium borohydride is one of the eminent model reactions to study catalytic behavior as it enables assessing the catalyst from the kinetic parameters calculated from the real-time spectroscopic monitoring of an aqueous solution. Pd–Co alloys show good catalytic activity towards the reduction of 4-NP and their rate constants were calculated. The catalytic studies reveal that reduction reaction catalyzed by prepared Pd–Co alloys follow the pseudo-first-order kinetics. Among them, Pd26Co74 catalyzed the reduction reaction with the minimum time of 7 min having a rate constant of 6.65 ms−1. The turn over frequency (TOF) for the corresponding alloy was calculated and found to be 26 h−1.
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Acknowledgements
One of the authors, T. A. Revathy, acknowledges UGC-UPE-Phase II for the financial assistance as a fellowship. Authors thank Dr. J. Senthil Selvan, Department of Nuclear physics, University of Madras, for access to UV–Vis absorption spectroscopy and K. C. Dharani Balaji, IIT Madras, is also acknowledged for HRSEM measurements.
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Revathy, T.A., Sivaranjani, T., Boopathi, A.A. et al. Pd–Co alloy as an efficient recyclable catalyst for the reduction of hazardous 4-nitrophenol. Res Chem Intermed 45, 815–832 (2019). https://doi.org/10.1007/s11164-018-3645-0
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DOI: https://doi.org/10.1007/s11164-018-3645-0