Academic Journal
Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina
| العنوان: | Catalytic Decomposition of HO over Manganese Oxides Supported on an Active Alumina |
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| المؤلفون: | Nasr-Allah M. Deraz, M.A. El-Sayed, A. Abd. El-Aal |
| المصدر: | Adsorption Science & Technology, Vol 19 (2001) |
| بيانات النشر: | SAGE Publishing, 2001. |
| سنة النشر: | 2001 |
| المجموعة: | LCC:Physical and theoretical chemistry |
| مصطلحات موضوعية: | Physical and theoretical chemistry, QD450-801 |
| الوصف: | 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. |
| نوع الوثيقة: | article |
| وصف الملف: | electronic resource |
| اللغة: | English |
| تدمد: | 0263-6174 2048-4038 |
| Relation: | https://doaj.org/toc/0263-6174; https://doaj.org/toc/2048-4038 |
| DOI: | 10.1260/0263617011494385 |
| URL الوصول: | https://doaj.org/article/8e119133a68d4c08bf8ab3605cfec981 |
| رقم الانضمام: | edsdoj.8e119133a68d4c08bf8ab3605cfec981 |
| قاعدة البيانات: | Directory of Open Access Journals |
| تدمد: | 02636174 20484038 |
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| DOI: | 10.1260/0263617011494385 |