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Understanding the role of surface Lewis acid sites of Sn modified Pd/Al2O3 catalyst in the chemoselective reductive N-acetylation of nitrobenzene

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Abstract

N-Aryl acetamides synthesis from the corresponding nitro compounds via a reductive N-acetylation was achieved over Pd supported on Sn modified Al2O3 catalyst using H2, acetic anhydride as acetylating agent in aqueous media at ambient temperature. The pyridine-IR data demonstrated a majority of Lewis acid sites compared to Brønsted acid sites on the catalyst surface. Pyridine-IR and CO pulse chemisorption results emphasized a combination of surface palladium in conjunction with Lewis acid sites were responsible for the high activity of 2wt%Pd/5wt%Sn–Al2O3 over 2wt%Pd/Al2O3 catalyst with consistent activity and selectivity for four recycles. The bulk and surface properties of the catalysts were characterized by BET-SA, XRD, XPS, TPD of NH3, H2-TPR, CO pulse chemisorption, TEM and the promotional effect of surface Lewis acid sites are rationalized by in situ pyridine adsorbed DRIFT spectroscopy.

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Acknowledgements

BS thank UGC New Delhi for the award of fellowship. There is no conflict of interest pertaining to the results presented in this paper.

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Authors and Affiliations

  1. Catalysis and Fine Chemicals Division, CSIR – Indian Institute of Chemical Technology, Tarnaka, Hyderabad, Telangana, 500 007, India

    Vishali Bilakanti, Naresh Gutta, Vijay Kumar Velisoju, Mahesh Dumpalapally, Narender Nama & Venugopal Akula

  2. Department of Chemical Engineering, BITS Pilani Hyderabad Campus, Hyderabad, Telangana, 500 078, India

    Sreedhar Inkollu

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  1. Vishali Bilakanti
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  2. Naresh Gutta
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Bilakanti, V., Gutta, N., Velisoju, V.K. et al. Understanding the role of surface Lewis acid sites of Sn modified Pd/Al2O3 catalyst in the chemoselective reductive N-acetylation of nitrobenzene. Reac Kinet Mech Cat 130, 347–362 (2020). https://doi.org/10.1007/s11144-020-01765-0

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