Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts
Pure alumina, V 2 O 5 –Al 2 O 3 and Na 2 O-doped V 2 O 5 /Al 2 O 3 samples have been obtained and roasted in air over the temperature range 400–750°C. The textural properties of all the calcination products have been determined from nitrogen adsorption studies at 77 K. The inclusion of V 2 O 5 in al...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
1995-03-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361749501200104 |
| _version_ | 1797285525763129344 |
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| author | Th. El-Nabarawy M. Mokhtar G.A. El-Shobaky |
| author_facet | Th. El-Nabarawy M. Mokhtar G.A. El-Shobaky |
| author_sort | Th. El-Nabarawy |
| collection | DOAJ |
| description | Pure alumina, V 2 O 5 –Al 2 O 3 and Na 2 O-doped V 2 O 5 /Al 2 O 3 samples have been obtained and roasted in air over the temperature range 400–750°C. The textural properties of all the calcination products have been determined from nitrogen adsorption studies at 77 K. The inclusion of V 2 O 5 in alumina modifies the textural characteristics leading to an enhancement of activation at temperatures ≤450°C and to an enhancement of sintering at higher temperatures. Furthermore, AlV 2 O 4 which formed at temperatures below 750°C resulted in a tremendous change in the textural properties. Three types of sintering were detected, i.e. particle-particle adhesion, pore widening and phase change. Doping with Na 2 O retards sintering and at low calcination temperatures gave solids with higher surface areas compared to undoped samples. This has been attributed to activation brought about by the decomposition of NaNO 3 and the evolution of nitrogen oxides. |
| first_indexed | 2024-03-07T18:03:32Z |
| format | Article |
| id | doaj.art-57063161a3dd496cb26c3a361d8fdb28 |
| institution | Directory Open Access Journal |
| issn | 0263-6174 2048-4038 |
| language | English |
| last_indexed | 2024-03-07T18:03:32Z |
| publishDate | 1995-03-01 |
| publisher | SAGE Publications |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj.art-57063161a3dd496cb26c3a361d8fdb282024-03-02T09:53:39ZengSAGE PublicationsAdsorption Science & Technology0263-61742048-40381995-03-011210.1177/026361749501200104Texture Properties of Undoped and NaO-doped VO/AlO, CatalystsTh. El-Nabarawy0M. Mokhtar1G.A. El-Shobaky2Department of Physical Chemistry. Laboratory of Surface Chemistry and Catalysis, National Research Centre, Dokki, Cairo, Egypt.Department of Physical Chemistry. Laboratory of Surface Chemistry and Catalysis, National Research Centre, Dokki, Cairo, Egypt.Department of Physical Chemistry. Laboratory of Surface Chemistry and Catalysis, National Research Centre, Dokki, Cairo, Egypt.Pure alumina, V 2 O 5 –Al 2 O 3 and Na 2 O-doped V 2 O 5 /Al 2 O 3 samples have been obtained and roasted in air over the temperature range 400–750°C. The textural properties of all the calcination products have been determined from nitrogen adsorption studies at 77 K. The inclusion of V 2 O 5 in alumina modifies the textural characteristics leading to an enhancement of activation at temperatures ≤450°C and to an enhancement of sintering at higher temperatures. Furthermore, AlV 2 O 4 which formed at temperatures below 750°C resulted in a tremendous change in the textural properties. Three types of sintering were detected, i.e. particle-particle adhesion, pore widening and phase change. Doping with Na 2 O retards sintering and at low calcination temperatures gave solids with higher surface areas compared to undoped samples. This has been attributed to activation brought about by the decomposition of NaNO 3 and the evolution of nitrogen oxides.https://doi.org/10.1177/026361749501200104 |
| spellingShingle | Th. El-Nabarawy M. Mokhtar G.A. El-Shobaky Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts Adsorption Science & Technology |
| title | Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts |
| title_full | Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts |
| title_fullStr | Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts |
| title_full_unstemmed | Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts |
| title_short | Texture Properties of Undoped and NaO-doped VO/AlO, Catalysts |
| title_sort | texture properties of undoped and nao doped vo alo catalysts |
| url | https://doi.org/10.1177/026361749501200104 |
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