Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts
Well-dispersed uniform spheres of crystalline CeO 2 were prepared by calcining precursor particles obtained by heating ammonium cerium nitrate for 4 h. These spherical substrates were examined using XRD and TEM methods, and by nitrogen adsorption studies at −196 °C. Subsequently, such cerium oxide p...
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| Format: | Article |
| Language: | English |
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SAGE Publishing
2009-05-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/026361709790252605 |
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| author | N.M. Deraz A. Alarifi |
| author_facet | N.M. Deraz A. Alarifi |
| author_sort | N.M. Deraz |
| collection | DOAJ |
| description | Well-dispersed uniform spheres of crystalline CeO 2 were prepared by calcining precursor particles obtained by heating ammonium cerium nitrate for 4 h. These spherical substrates were examined using XRD and TEM methods, and by nitrogen adsorption studies at −196 °C. Subsequently, such cerium oxide particles prepared by calcination at 400–600 °C were used as catalysts for the conversion of isopropanol at 250–450 °C, using a flow method. The results obtained showed that increasing the heating temperature of the system investigated from 400 °C to 600 °C stimulated the formation of a well-crystallized CeO 2 phase having a crystallite size varying between 10 and 20 nm. Both the surface area and catalytic activity of cerium oxide were found to decrease on increasing the calcination temperature. All solids investigated behaved as dehydrogenation catalysts which were selective towards the formation of acetone. The heat treatment did not alter the mechanism of dehydrogenation of isopropanol, but changed the concentration of active sites involved in the catalyzed reaction without altering their energetic nature. |
| format | Article |
| id | doaj-art-19e5fbbcb90f458ba020f4adbcf5e29c |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2009-05-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-19e5fbbcb90f458ba020f4adbcf5e29c2025-01-03T01:23:07ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382009-05-012710.1260/026361709790252605Structural, Surface and Catalytic Properties of Nano-Sized Ceria CatalystsN.M. Deraz0A. Alarifi1 Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi ArabiaWell-dispersed uniform spheres of crystalline CeO 2 were prepared by calcining precursor particles obtained by heating ammonium cerium nitrate for 4 h. These spherical substrates were examined using XRD and TEM methods, and by nitrogen adsorption studies at −196 °C. Subsequently, such cerium oxide particles prepared by calcination at 400–600 °C were used as catalysts for the conversion of isopropanol at 250–450 °C, using a flow method. The results obtained showed that increasing the heating temperature of the system investigated from 400 °C to 600 °C stimulated the formation of a well-crystallized CeO 2 phase having a crystallite size varying between 10 and 20 nm. Both the surface area and catalytic activity of cerium oxide were found to decrease on increasing the calcination temperature. All solids investigated behaved as dehydrogenation catalysts which were selective towards the formation of acetone. The heat treatment did not alter the mechanism of dehydrogenation of isopropanol, but changed the concentration of active sites involved in the catalyzed reaction without altering their energetic nature.https://doi.org/10.1260/026361709790252605 |
| spellingShingle | N.M. Deraz A. Alarifi Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts Adsorption Science & Technology |
| title | Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts |
| title_full | Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts |
| title_fullStr | Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts |
| title_full_unstemmed | Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts |
| title_short | Structural, Surface and Catalytic Properties of Nano-Sized Ceria Catalysts |
| title_sort | structural surface and catalytic properties of nano sized ceria catalysts |
| url | https://doi.org/10.1260/026361709790252605 |
| work_keys_str_mv | AT nmderaz structuralsurfaceandcatalyticpropertiesofnanosizedceriacatalysts AT aalarifi structuralsurfaceandcatalyticpropertiesofnanosizedceriacatalysts |