Abdelrahman A. Badawy*, Ahmed M. Rashad, Shaimaa M. Ibrahim and Sahar M. El-Khouly Pages 159 - 169 ( 11 )
Background & Objective: The role of CeO2-doping (0.75-3 mol%) and calcination temperature on solid-solid interaction between ferric and cadmium oxides yielding cadmium ferrites was examined.Methods and Results: The results exposed that ceria improves the ferrite formation by heating at 600-700ºC via the dissolution of some dopant cation in the lattice of CdO with the subsequent creation of anionic vacancies and/or formation of higher valency cadmium cation (Cd(2+δ)+). SBET of solids calcined at 500oC increased by CeO2-doping, while opposite trend for solids calcined at 600 and 700oC. The magnetic hysteresis loops of all samples showed room-temperature ferromagnetism with different hysteresis loop shapes. Conclusion: Magnetization increased by CeO2-doping that might be due to the enhancement of cadmium ferrite formation. Ethanol conversion increased by increasing CeO2-doping. Dehydrogenation product (acetaldehyde) was mainly the yield of ethanol conversion. The maximum yield of acetaldehyde (92.97%) carried out for solids doped with 3 mol% CeO2.
Cadmium ferrite, ethanol conversion, ionic vacancies, CeO2- doping, dehydrogenation of ethanol, solids calcined.
Physical Chemistry Department, National Research Centre, Dokki, Cairo, Analysis and Evaluation Department, Egyptian Petroleum Research Institute, Nasr City, Cairo, Department of Chemistry, Faculty of Education, Ain Shams University, Cairo, Physical Chemistry Department, National Research Centre, Dokki, Cairo