Oxidative coupling of carboxylic acids or benzaldehydes with DMF using hydrotalicite-derived oxide catalysts

Priya S. Samudrala, Akhil V. Nakhate, Shyam Sunder R. Gupta, Kalidas B. Rasal, Gunjan P. Deshmukh, Chandrakanth R. Gadipelly, Srinivas Theegala, Deepa K. Dumbre, Selvakannan Periasamy, V. R.Chary Komandur, Suresh K. Bhargava, Lakshmi Kantam Mannepalli

    Research output: Contribution to journalArticlepeer-review

    15 Scopus citations

    Abstract

    Hydrotalcite-derived (HT-derived) oxide catalysts were synthesised from hydrotalcite-like (HT-like) materials prepared by co-precipitation method (Cu-Al, Cu-Fe, Mg-Al, Mg-Fe, Ni-Fe and Ni-Al) followed by calcination and their catalytic activity was studied for oxidative amidation of carboxylic acids and substituted benzaldehydes with N,N-dimethylformamide (DMF). Catalyst screening was done using benzoic acid and DMF as a model reaction. Subsequently, we have optimised the reaction with different reaction parameters, catalyst loading, temperatures and oxidants. Cu-Fe HT-derived oxide catalyst showed excellent activity towards oxidative amidation using TBHP as an oxidant at 80 °C in 10 h. The fresh and spent catalysts were thoroughly characterised by different analytical techniques; XRD, SEM, HRTEM, TPD, N2 adsorption-desorption isotherm and XPS. Moreover, the catalyst was easily separated by simple filtration and reused up to four cycles without significant loss in catalytic activity.

    Original languageBritish English
    Pages (from-to)348-357
    Number of pages10
    JournalApplied Catalysis B: Environmental
    Volume240
    DOIs
    StatePublished - Jan 2019

    Keywords

    • Aldehydes
    • Carboxylic acid
    • Dimethylformamide
    • Heterogeneous catalyst
    • Oxidative coupling

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