Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System
Ferric–nickel/aluminium mixed oxide solids have the formula Fe 2 O 3 –0.42NiO/Al 2 O 3 were treated with Li 2 O (0.75–3 mol%) and heated in air for 4 h at 500°C and 800°C, respectively. The effects of this treatment on the surface characteristics of these solids and their catalytic properties in rel...
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1998-02-01
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Series: | Adsorption Science & Technology |
Online Access: | https://doi.org/10.1177/026361749801600104 |
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doaj-e36d4d9de6cf4ec6bae1753eac312c912021-04-02T13:24:39ZengHindawi - SAGE PublishingAdsorption Science & Technology0263-61742048-40381998-02-011610.1177/026361749801600104Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO SystemG.A. El-Shobaky0A.M. Ghozza1N.M. Deraz2National Research Centre, Dokki. Cairo, Egypt.Department of Chemistry, Faculty of Science, Zagazig University, Zagazig, Egypt.National Research Centre, Dokki. Cairo, Egypt.Ferric–nickel/aluminium mixed oxide solids have the formula Fe 2 O 3 –0.42NiO/Al 2 O 3 were treated with Li 2 O (0.75–3 mol%) and heated in air for 4 h at 500°C and 800°C, respectively. The effects of this treatment on the surface characteristics of these solids and their catalytic properties in relation to CO oxidation by O 2 have been investigated. The results reveal that Li 2 O doping at 0.75 mol% concentration resulted in an increase of 24% and 18%, respectively, in the value of the specific surface areas, SBET, of the solids precalcined at 500°C and 800°C, while the addition of 3 mol% Li 2 O led to a slight decrease of ca. 10% in the SBET value of the same solids. In contrast, irrespective of whether the doping process involved solids precalcined at 500°C or 800°C, a significant decrease of 37% and 78%, respectively, was observed in the catalytic activity of these materials. This decrease in catalytic activity was not accompanied by any appreciable change in the magnitude of the activation energy for the catalytic reaction, i.e. Li 2 O doping brings about a decrease in the concentration of catalytically active sites without changing their energetic nature.https://doi.org/10.1177/026361749801600104 |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
G.A. El-Shobaky A.M. Ghozza N.M. Deraz |
spellingShingle |
G.A. El-Shobaky A.M. Ghozza N.M. Deraz Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System Adsorption Science & Technology |
author_facet |
G.A. El-Shobaky A.M. Ghozza N.M. Deraz |
author_sort |
G.A. El-Shobaky |
title |
Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System |
title_short |
Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System |
title_full |
Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System |
title_fullStr |
Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System |
title_full_unstemmed |
Effect of LiO Doping on the Surface and Catalytic Properties of the FeO–NiO/AlO System |
title_sort |
effect of lio doping on the surface and catalytic properties of the feo–nio/alo system |
publisher |
Hindawi - SAGE Publishing |
series |
Adsorption Science & Technology |
issn |
0263-6174 2048-4038 |
publishDate |
1998-02-01 |
description |
Ferric–nickel/aluminium mixed oxide solids have the formula Fe 2 O 3 –0.42NiO/Al 2 O 3 were treated with Li 2 O (0.75–3 mol%) and heated in air for 4 h at 500°C and 800°C, respectively. The effects of this treatment on the surface characteristics of these solids and their catalytic properties in relation to CO oxidation by O 2 have been investigated. The results reveal that Li 2 O doping at 0.75 mol% concentration resulted in an increase of 24% and 18%, respectively, in the value of the specific surface areas, SBET, of the solids precalcined at 500°C and 800°C, while the addition of 3 mol% Li 2 O led to a slight decrease of ca. 10% in the SBET value of the same solids. In contrast, irrespective of whether the doping process involved solids precalcined at 500°C or 800°C, a significant decrease of 37% and 78%, respectively, was observed in the catalytic activity of these materials. This decrease in catalytic activity was not accompanied by any appreciable change in the magnitude of the activation energy for the catalytic reaction, i.e. Li 2 O doping brings about a decrease in the concentration of catalytically active sites without changing their energetic nature. |
url |
https://doi.org/10.1177/026361749801600104 |
work_keys_str_mv |
AT gaelshobaky effectofliodopingonthesurfaceandcatalyticpropertiesofthefeonioalosystem AT amghozza effectofliodopingonthesurfaceandcatalyticpropertiesofthefeonioalosystem AT nmderaz effectofliodopingonthesurfaceandcatalyticpropertiesofthefeonioalosystem |
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