Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System
Well-defined CoFe 2 O 4 nanoparticles with an average grain size of about 50 nm were successfully synthesized by a combustion method employing different ratios of fuel to cations within the range 0–2.67. The as-prepared powders were characterized and investigated by TG, XRD, IR, SEM, TEM and VSM met...
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
2009-10-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263-6174.27.8.797 |
| _version_ | 1797283744531349504 |
|---|---|
| author | N.M. Deraz M.K. El-Aiashy Suzan A. Ali |
| author_facet | N.M. Deraz M.K. El-Aiashy Suzan A. Ali |
| author_sort | N.M. Deraz |
| collection | DOAJ |
| description | Well-defined CoFe 2 O 4 nanoparticles with an average grain size of about 50 nm were successfully synthesized by a combustion method employing different ratios of fuel to cations within the range 0–2.67. The as-prepared powders were characterized and investigated by TG, XRD, IR, SEM, TEM and VSM methods, and via isopropanol conversion at 250–450 °C. The results showed that increasing the ratio between fuel and cations stimulated the formation of cobalt ferrite due to the increasing flame temperature. Changing the fuel/cation ratio brought about modifications in the structure, surface activity, selectivity and magnetic properties of the investigated solids. A fuel/cation ratio of 2 led to the formation of catalyst having a high activity (49%) and magnetization (77.54 emu/g). All the solids investigated behaved as dehydrogenation catalysts leading to the formation of acetone as the major product. The fuel/cation ratio did not alter the mechanism of dehydrogenation of isopropanol, but increased the concentration of active sites involved in the catalyzed reaction. |
| first_indexed | 2024-03-07T17:36:13Z |
| format | Article |
| id | doaj.art-a66e79f77f5b492ea81a56e498b5a743 |
| institution | Directory Open Access Journal |
| issn | 0263-6174 2048-4038 |
| language | English |
| last_indexed | 2024-03-07T17:36:13Z |
| publishDate | 2009-10-01 |
| publisher | SAGE Publications |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-a66e79f77f5b492ea81a56e498b5a7432024-03-02T16:48:47ZengSAGE PublicationsAdsorption Science & Technology0263-61742048-40382009-10-012710.1260/0263-6174.27.8.797Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite SystemN.M. Deraz0M.K. El-Aiashy1Suzan A. Ali2 Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia Chemistry Department, Faculty of Girls, Ain Shams University, Heliopolis, Cairo, Egypt Chemistry Department, Faculty of Girls, Ain Shams University, Heliopolis, Cairo, EgyptWell-defined CoFe 2 O 4 nanoparticles with an average grain size of about 50 nm were successfully synthesized by a combustion method employing different ratios of fuel to cations within the range 0–2.67. The as-prepared powders were characterized and investigated by TG, XRD, IR, SEM, TEM and VSM methods, and via isopropanol conversion at 250–450 °C. The results showed that increasing the ratio between fuel and cations stimulated the formation of cobalt ferrite due to the increasing flame temperature. Changing the fuel/cation ratio brought about modifications in the structure, surface activity, selectivity and magnetic properties of the investigated solids. A fuel/cation ratio of 2 led to the formation of catalyst having a high activity (49%) and magnetization (77.54 emu/g). All the solids investigated behaved as dehydrogenation catalysts leading to the formation of acetone as the major product. The fuel/cation ratio did not alter the mechanism of dehydrogenation of isopropanol, but increased the concentration of active sites involved in the catalyzed reaction.https://doi.org/10.1260/0263-6174.27.8.797 |
| spellingShingle | N.M. Deraz M.K. El-Aiashy Suzan A. Ali Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System Adsorption Science & Technology |
| title | Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System |
| title_full | Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System |
| title_fullStr | Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System |
| title_full_unstemmed | Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System |
| title_short | Novel Preparation and Physicochemical Characterization of a Nanocrystalline Cobalt Ferrite System |
| title_sort | novel preparation and physicochemical characterization of a nanocrystalline cobalt ferrite system |
| url | https://doi.org/10.1260/0263-6174.27.8.797 |
| work_keys_str_mv | AT nmderaz novelpreparationandphysicochemicalcharacterizationofananocrystallinecobaltferritesystem AT mkelaiashy novelpreparationandphysicochemicalcharacterizationofananocrystallinecobaltferritesystem AT suzanaali novelpreparationandphysicochemicalcharacterizationofananocrystallinecobaltferritesystem |