Abstract
This work demostratres the synthesis of different metal (Ca, Zn, Ni and Cu) alginate-supported silver nanoparticles (Agnp-MA, M and A for metal and alginate respectively) by using microwave irradiation process. The characterization of these composites has been carried out through UV–vis spectra, XRD, HRTEM and FESEM analysis which confirms the formation of spherical and crystalline nanoparticles in all MA supports with particles size range of 5–8 nm. All MAs show excellent reducing and stabilizing capabilities towards Agnp and act as support for nanoparticles too. The catalytic activities of all Agnp-MAs are tested in acylation reactions of various amines and alcohols in solvent-free medium using acetic acid as green acylating agent. The detail ionic mechanism of acylation reaction has been demonstrated. Thermal stability of all catalysts was investigated through TGA analysis and the reusability of the catalysts in a reaction is explained in terms of their thermal stability. The order of stability is Agnp-CaA > Agnp-ZnA > Agnp-NiA > Agnp-CuA. Consequently, Agnp-CaA shows best reusability property than other Agnp-MAs in the reaction and can perform well up to 5th run. Heterogeneous kinetic models are proposed for the reaction.
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