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Synthesis of delafossite CuCrO2 via solution combustion method and its acid functionalization for biodiesel production

2023; Associação Brasileira de Cerâmica; Volume: 69; Issue: 389 Linguagem: Inglês

10.1590/0366-69132023693893380

1678-4553

Marlyson C. Viegas, Gilvan Pereira de Figueredo, Samuel Filgueiras Rodrigues, Aluísio A. Cabral, M.A.M. Castro, Marcelo Moizinho Oliveira,

Copper-based nanomaterials and applications

CuCrO2 was synthesized by solution combustion synthesis (SCS) and applied as a heterogeneous catalyst to produce soybean biodiesel. The combustion reaction was carried out using urea as a fuel, and copper (II) and chromium (III) nitrates as precursors. After the powders’ obtention, these were calcined and functionalized in an acidic medium. The powders were characterized by thermogravimetry (TG), X-ray diffraction (XRD), scanning electron microscopy (SEM), and infrared spectroscopy (IR) techniques. The TG curve revealed that the formation of the CuCrO2 in the combustion reaction remained stable up to 1000 °C. The XRD results confirmed the formation of the CuCrO2 compound. The SEM images showed that the crystallinity of the samples increased after the calcination process. The IR spectra showed the presence of delafossite characteristic bands. After the transesterification reaction, biodiesel was obtained with a yield of around 80%. Thus, catalysts based on delafossite synthesized through the combustion method and functionalized showed to be promising for the transesterification reaction of vegetable oils.