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Tuning Surface Modification of Potasium Boasted Phosphomolybdic Acid Catalysts for Selective Oxidative Esterification of Benzyl alcohol

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Abstract

A series of potasium boasted phosphomolybdic acid (PM) catalysts were successfully synthesized by ion-exchange method. These materials were characterized by BET surface area, FT-IR, XRD, Pyridine adsorbed FT-IR and TEM analysis to find the structural and nature of acidic sites of the catalyst. BET surface area result reveals that surface area significantly improved after K loadings compare to pure phosphomolybdic acid. XRD results provide crystallites of cubic Keggin ion were observed after K loading. FT-IR results provide characteristic Keggin ion bands were retained even after K loadings. TEM analysis reveals spherical morphology is maintained even after K loadings and KPM-2 catalyst exhibits smaller particle size than other K loadings. Pyridine adsorbed FT-IR spectra exhibits Brønsted to Lewis acidic sites ratio is higher in case of KPM-2 when compared to other K loadings. These synthesized K boasted PM materials were evaluated for oxidative esterification of benzyl alcohol to methyl benzoate possesses higher activity and selectivity during reaction than pure PM catalyst.

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Scheme 1: Selective oxidation of benzyl alcohol over potasium boasted phosphomolybdic acid catalyst

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Acknowledgements

The authors thank to Sri GCSR College, Rajam and RMIT University, Melbourne.

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Authors and Affiliations

  1. Department of Chemistry, Sri GCSR College, Rajam (Affiliated to Dr. B. R. Ambedkar University, Srikakulam), Andhra Pradesh, 532127, India

    Jhansi Pedada

  2. Centre for Applied Materials and Industrial Chemistry (CAMIC), School of Science, RMIT University, 124 La Trobe Street, Melbourne, VIC, 3000, Australia

    Venkata D. B. C. Dasireddy

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  1. Jhansi Pedada
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Correspondence to Jhansi Pedada.

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Pedada, J., Dasireddy, V.D.B.C. Tuning Surface Modification of Potasium Boasted Phosphomolybdic Acid Catalysts for Selective Oxidative Esterification of Benzyl alcohol. Catal Lett 154, 1642–1647 (2024). https://doi.org/10.1007/s10562-023-04414-y

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