Physical Adsorption Studies on Mixed Vanadium Oxide Catalysts
Physisorption of N 2 gas at 77 K has been used to measure the surface area (S BET ) and porosity of V 2 O 5 pure and mixtures with Fe, Co or Ni ions in atomic ratios extending from 1 to 50 at %. Calcination of samples was carried out between 473 and 873 K in flowing air. Adsorption isotherms are of...
| Main Authors: | , , |
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| Format: | Article |
| Language: | English |
| Published: |
SAGE Publications
1984-06-01
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| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1177/026361748400100206 |
| Summary: | Physisorption of N 2 gas at 77 K has been used to measure the surface area (S BET ) and porosity of V 2 O 5 pure and mixtures with Fe, Co or Ni ions in atomic ratios extending from 1 to 50 at %. Calcination of samples was carried out between 473 and 873 K in flowing air. Adsorption isotherms are of type IV in the Braunauer classification with hysteresis loops of mixed A and B types, which reveal a very small external surface. Calculation of the pore volume distribution was carried out in addition to V a -t plots in order to study the surface porosity nature which was found to be mesoporous. Finally, the effect of foreign ions on S BET was discussed. |
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| ISSN: | 0263-6174 2048-4038 |