influence of synthesis parameters on the properties of nanostructured γ-alumina using plackett-burman experimental design

Mesoporous nanostructured γ-al2o3 powders were synthesized through multi step precipitation procedures using the phswing technique. structural and morphological characteristics in addition to the thermal behavior of the procured samples were characterized via x-ray diffraction (xrd), field emission scanning electron microscopy (fesem), fourier transform infrared (ft-ir) spectroscopy, thermogravimetryderivative thermal gravimetric  (tg-dtg) and n2 adsorption–desorption isotherm. plackettburman design was implemented as a screening method to examine the impacts of fifteen variables on physical properties of synthesized γ-al2o3 as a response variable. specific surface area, pore volume and average pore diameter of the prepared samples were found to be within the ranges of 72335.7 m²/g, 0.261.03 cm²/g and 4.615.2 nm, respectively. it was determined that the variables including ph value on the acidic region, time in the alkaline region and number of ph-swing frequencies had major effects on the pore diameter of the procured γ-al2o3 powders. calcination by steaming had the most significant effect on specific surface area, while the ph value on the acidic region had the greatest impact on pore volume.