Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst
The present work aims at obtaining a suitable and selective catalyst for catalytic dehydrogenation reactions through designing pore structures of silica-containing alumina nanocomposites by optimizing silica content in the structure. In this trend, series of silica-containing alumina nanocomposites...
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Egyptian Petroleum Research Institute
2014-12-01
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| Series: | Egyptian Journal of Petroleum |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110062114000713 |
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| author | Osama Saber Heba M. Gobara |
| author_facet | Osama Saber Heba M. Gobara |
| author_sort | Osama Saber |
| collection | DOAJ |
| description | The present work aims at obtaining a suitable and selective catalyst for catalytic dehydrogenation reactions through designing pore structures of silica-containing alumina nanocomposites by optimizing silica content in the structure. In this trend, series of silica-containing alumina nanocomposites with different molar ratios Al2O3/SiO2 were prepared by the solvothermal method. According to surface characterization of silica-containing alumina nanocomposites, the sample with the highest molar ratio of Al2O3/SiO2 (2.06) showed mesoporous structure with selective pore sizes of 3.7 and 4.6 nm. In addition, it had a high surface area value of 308 m2/g. Furthermore, SEM and TEM images of the same sample showed ultra fine sized particles in the nano size (7–17 nm). Dehydrogenation catalysts, as developed structures, were then achieved by loading 0.6 wt.% platinum metal over the prepared nanocomposites. Performances of the prepared nanocatalysts were investigated via the dehydrogenation of a model compound namely; cyclohexane. Experimental results showed that the Pt catalyst supported on the silica-containing alumina nanocomposites with the highest molar ratio of Al2O3/SiO2, is an efficient and selective catalyst toward the dehydrogenation reaction. This was revealed in terms of 100% selectivity of this catalyst toward the conversion of cyclohexane at all ranges of temperatures with the conversion reaction being temperature dependent. Practically, the total conversion of cyclohexane increased with increasing reaction temperature and reached 100% at 450 °C while the prepared catalyst demonstrated absolute selectivity. |
| format | Article |
| id | doaj-art-8b1cd8dbca3d4c6c9b9518a033611f9c |
| institution | DOAJ |
| issn | 1110-0621 |
| language | English |
| publishDate | 2014-12-01 |
| publisher | Egyptian Petroleum Research Institute |
| record_format | Article |
| series | Egyptian Journal of Petroleum |
| spelling | doaj-art-8b1cd8dbca3d4c6c9b9518a033611f9c2025-08-20T03:04:42ZengEgyptian Petroleum Research InstituteEgyptian Journal of Petroleum1110-06212014-12-0123444545410.1016/j.ejpe.2014.11.001Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalystOsama Saber0Heba M. Gobara1Physics Dept, Faculty of Science, King Faisal University, P.O. 400, Al-Hassa 31982, Saudi ArabiaEgyptian Petroleum Research Institute, Nasr City, P.O. 11727, Cairo, EgyptThe present work aims at obtaining a suitable and selective catalyst for catalytic dehydrogenation reactions through designing pore structures of silica-containing alumina nanocomposites by optimizing silica content in the structure. In this trend, series of silica-containing alumina nanocomposites with different molar ratios Al2O3/SiO2 were prepared by the solvothermal method. According to surface characterization of silica-containing alumina nanocomposites, the sample with the highest molar ratio of Al2O3/SiO2 (2.06) showed mesoporous structure with selective pore sizes of 3.7 and 4.6 nm. In addition, it had a high surface area value of 308 m2/g. Furthermore, SEM and TEM images of the same sample showed ultra fine sized particles in the nano size (7–17 nm). Dehydrogenation catalysts, as developed structures, were then achieved by loading 0.6 wt.% platinum metal over the prepared nanocomposites. Performances of the prepared nanocatalysts were investigated via the dehydrogenation of a model compound namely; cyclohexane. Experimental results showed that the Pt catalyst supported on the silica-containing alumina nanocomposites with the highest molar ratio of Al2O3/SiO2, is an efficient and selective catalyst toward the dehydrogenation reaction. This was revealed in terms of 100% selectivity of this catalyst toward the conversion of cyclohexane at all ranges of temperatures with the conversion reaction being temperature dependent. Practically, the total conversion of cyclohexane increased with increasing reaction temperature and reached 100% at 450 °C while the prepared catalyst demonstrated absolute selectivity.http://www.sciencedirect.com/science/article/pii/S1110062114000713Silica-containing alumina nanocompositesPt nanocatalystCyclohexane dehydrogenationScanning and transmission electron microscopySurface characterization |
| spellingShingle | Osama Saber Heba M. Gobara Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst Egyptian Journal of Petroleum Silica-containing alumina nanocomposites Pt nanocatalyst Cyclohexane dehydrogenation Scanning and transmission electron microscopy Surface characterization |
| title | Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst |
| title_full | Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst |
| title_fullStr | Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst |
| title_full_unstemmed | Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst |
| title_short | Optimization of silica content in alumina-silica nanocomposites to achieve high catalytic dehydrogenation activity of supported Pt catalyst |
| title_sort | optimization of silica content in alumina silica nanocomposites to achieve high catalytic dehydrogenation activity of supported pt catalyst |
| topic | Silica-containing alumina nanocomposites Pt nanocatalyst Cyclohexane dehydrogenation Scanning and transmission electron microscopy Surface characterization |
| url | http://www.sciencedirect.com/science/article/pii/S1110062114000713 |
| work_keys_str_mv | AT osamasaber optimizationofsilicacontentinaluminasilicananocompositestoachievehighcatalyticdehydrogenationactivityofsupportedptcatalyst AT hebamgobara optimizationofsilicacontentinaluminasilicananocompositestoachievehighcatalyticdehydrogenationactivityofsupportedptcatalyst |