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

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

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4 Scopus citations

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.
Original languageEnglish (US)
Pages (from-to)347-362
Number of pages16
JournalReaction Kinetics, Mechanisms and Catalysis
Volume130
Issue number1
DOIs
StatePublished - Jun 1 2020
Externally publishedYes

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Generated from Scopus record by KAUST IRTS on 2023-10-23

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