Studies of the Solvent-Free Knoevenagel Condensation over Commercial NiO compared with NiO Drived from Hydrotalcites

In this study, we compared the effect of commercial NiO, synthesis NiAl-HT and NiO-HT drived from hydrotalcite in Knoevenagel condensation reaction. The sample was synthesized by coprecipitation method with a molar ratio M2+/M3+ = 2 at constant basic pH. X-ray Diffraction (XRD) Fourier Transform Infrared Spectroscopy (FTIR) were utilized to identify crystalline phases present NiAl-HT, NiO. chemical composition obtained solids determined Atomic Absorption (AAS). Other techniques, such as Thermogravimetric Thermal Analyzer (TGA), Scanning Electron Microscopy (SEM) Brunauere Emmette Teller Method (BET) also used. As well BET showed increase specific surface for solid NiO-HT. performance catalysts studied benzaldehyde ethyl acetoacetate without solvent organic compounds intermediates dihydropyridines derivatives. influence different parameters, catalyst amount, reaction temperature time optimized activity, selectivity stability solids. Catalytic activity its lowest presence (26% conversion) whereas conversion increased 77% case which can be explained sites oxides, high area small crystallite size. Therefore, lower noticed using NiO (84%), perhaps owing purity. A mechanism is proposed density functional (DFT). Copyright © 2023 Authors, Published BCREC Group. This an open access article under CC BY-SA License (https://creativecommons.org/licenses/by-sa/4.0)