The nanostructure mixed oxides powder CeO2-Al2O3 has been synthesized by the combustion of gel from polyvinyl alcohol (PVA) as polymer basic and mixture metal nitrate at 850°C for 2 hours. Characterization of mixed oxides powder CeO2-Al2O3 was determined by X-ray Diffraction (XRD), Scanning Electron Microscopy (SEM) and specific surface area analysis from N2 adsorption data at 77 K by Brunaure Emmet Teller (BET) method. The gel combustion method was a successful method with short time for synthesis, available raw materials and without special equipment. The simple phase of mixed oxides powder CeO2-Al2O3 were obtained from thermal treatment at 850°C for 2 hrs. The optimum conditions of synthesis method: (Al3+ + Ce4+)/PV A molar ratio = 1:3, Ce4+1 Al3+ molar ratio = 5/5, pH = 4, gel formation temperature at 80°C. Samples synthesized under optimal conditions has average crystalline size 50 nm with large specific area of about 87.5 m2/g. The effects to structure, property of mixed oxides powder CeO2-Al2O3 as calcining temperature, gel formation pH and Ce4+ / Al3+ molar ratio have been studied.
Lọc theo danh mục
Lượt truy cập :
20,938,024
Xem toàn văn