Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina
A series of manganese oxides loaded on to an active alumina support was prepared by impregnation methods and the resulting samples preheated in air at 400°C, 650°C or 900°C for 6 h. The amount of manganese, expressed as Mn 2 O 3 , was varied between 3.7 wt% and 55.3 wt%. The kinetics of the decompos...
Saved in:
| Main Authors: | , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
SAGE Publishing
2001-09-01
|
| Series: | Adsorption Science & Technology |
| Online Access: | https://doi.org/10.1260/0263617011494385 |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1841564112921821184 |
|---|---|
| author | Nasr-Allah M. Deraz M.A. El-Sayed A. Abd. El-Aal |
| author_facet | Nasr-Allah M. Deraz M.A. El-Sayed A. Abd. El-Aal |
| author_sort | Nasr-Allah M. Deraz |
| collection | DOAJ |
| description | A series of manganese oxides loaded on to an active alumina support was prepared by impregnation methods and the resulting samples preheated in air at 400°C, 650°C or 900°C for 6 h. The amount of manganese, expressed as Mn 2 O 3 , was varied between 3.7 wt% and 55.3 wt%. The kinetics of the decomposition of H 2 O 2 in an aqueous medium were studied in the presence of these oxides. The catalytic activities increased initially as the amounts of manganese present increased, attaining a maximum value at 13.4 wt% Mn 2 O 3 and then decreasing on increasing both the amount of manganese above this limit and the precalcination temperature from 400°C to 900°C. The specific surface areas of the various catalysts were determined by BET analysis of the nitrogen adsorption isotherms. The S BET values varied from 244 m 2 /g to 80 m 2 /g both as a function of the extent of loading and the precalcination temperature. However, the activation energy for sintering, ΔE S , increased on increasing the amount of Mn 2 O 3 present. The apparent activation energy for H 2 O 2 decomposition conducted over the various solids was found to be virtually unaffected by a change in the amount of manganese present. |
| format | Article |
| id | doaj-art-8e119133a68d4c08bf8ab3605cfec981 |
| institution | Kabale University |
| issn | 0263-6174 2048-4038 |
| language | English |
| publishDate | 2001-09-01 |
| publisher | SAGE Publishing |
| record_format | Article |
| series | Adsorption Science & Technology |
| spelling | doaj-art-8e119133a68d4c08bf8ab3605cfec9812025-01-02T23:11:46ZengSAGE PublishingAdsorption Science & Technology0263-61742048-40382001-09-011910.1260/0263617011494385Catalytic Decomposition of HO over Manganese Oxides Supported on an Active AluminaNasr-Allah M. Deraz0M.A. El-Sayed1A. Abd. El-Aal2 Physical Chemistry Department, National Research Center, Dokki, Cairo, Egypt Chemistry Department, Faculty of Science, Zagazig University, Zagazig, Egypt Chemistry Department, Faculty of Science, Zagazig University, Zagazig, EgyptA series of manganese oxides loaded on to an active alumina support was prepared by impregnation methods and the resulting samples preheated in air at 400°C, 650°C or 900°C for 6 h. The amount of manganese, expressed as Mn 2 O 3 , was varied between 3.7 wt% and 55.3 wt%. The kinetics of the decomposition of H 2 O 2 in an aqueous medium were studied in the presence of these oxides. The catalytic activities increased initially as the amounts of manganese present increased, attaining a maximum value at 13.4 wt% Mn 2 O 3 and then decreasing on increasing both the amount of manganese above this limit and the precalcination temperature from 400°C to 900°C. The specific surface areas of the various catalysts were determined by BET analysis of the nitrogen adsorption isotherms. The S BET values varied from 244 m 2 /g to 80 m 2 /g both as a function of the extent of loading and the precalcination temperature. However, the activation energy for sintering, ΔE S , increased on increasing the amount of Mn 2 O 3 present. The apparent activation energy for H 2 O 2 decomposition conducted over the various solids was found to be virtually unaffected by a change in the amount of manganese present.https://doi.org/10.1260/0263617011494385 |
| spellingShingle | Nasr-Allah M. Deraz M.A. El-Sayed A. Abd. El-Aal Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina Adsorption Science & Technology |
| title | Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina |
| title_full | Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina |
| title_fullStr | Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina |
| title_full_unstemmed | Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina |
| title_short | Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina |
| title_sort | catalytic decomposition of ho over manganese oxides supported on an active alumina |
| url | https://doi.org/10.1260/0263617011494385 |
| work_keys_str_mv | AT nasrallahmderaz catalyticdecompositionofhoovermanganeseoxidessupportedonanactivealumina AT maelsayed catalyticdecompositionofhoovermanganeseoxidessupportedonanactivealumina AT aabdelaal catalyticdecompositionofhoovermanganeseoxidessupportedonanactivealumina |