Synthesis and characterization of Al 2 O 3 –SiO 2 –MgO nanocomposite prepared by sol–gel process as an efficient catalyst for the Knoevenagel condensation of aldehydes with malononitrile

摘要: The composite of Al2O3–SiO2 and Al2O3–SiO2–MgO nanocomposite were synthesized by sol–gel method FT-IR, XRD, FE-SEM, EDAX, TEM, BET surface area analysis used to characterize the as-prepared samples. XRD results show formation MgO phase in nanocomposite. FE-SEM images indicate uniform distribution nanoparticles matrix also amorphous spherical-like structures for nanocomposite, respectively. An increase compared is observed with adding MgO. catalytic activity was tested using them as an efficient base catalyst Knoevenagel condensation different aromatic aldehydes malononitrile at room temperature. can be easily separated reused several cycles.