Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol
Rice husk silica (RHS) was extracted from local rice husk by acid digestion and burning at 650 °C. RHS-Ni catalyst was prepared by dissolving RHS in 1 N NaOH and titrating with 3 N HNO3 containing 10 wt.% Ni2+. The organic modifiers, either p-amino benzoic acid (A) or p-phenylenediamine (PDA) were i...
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Egyptian Petroleum Research Institute
2013-06-01
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| Series: | Egyptian Journal of Petroleum |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110062112000608 |
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| author | Salah A. Hassan Ahmed M. Al-Sabagh Nasser H. Shalaby Samia A. Hanafi Hamdi A. Hassan |
| author_facet | Salah A. Hassan Ahmed M. Al-Sabagh Nasser H. Shalaby Samia A. Hanafi Hamdi A. Hassan |
| author_sort | Salah A. Hassan |
| collection | DOAJ |
| description | Rice husk silica (RHS) was extracted from local rice husk by acid digestion and burning at 650 °C. RHS-Ni catalyst was prepared by dissolving RHS in 1 N NaOH and titrating with 3 N HNO3 containing 10 wt.% Ni2+. The organic modifiers, either p-amino benzoic acid (A) or p-phenylenediamine (PDA) were incorporated in 5 wt.% and reduced in H2 flow. Investigation of the three catalysts, (RHS-Ni)R350, (RHS-Ni–A)R350 and (RHS-Ni–PDA)R350, confirmed good dispersion of Ni nanoparticles; all catalysts were amorphous. The BET surface areas increased in the order: (RHS-Ni)R350 < (RHS-Ni–A)R350 < (RHS-Ni–PDA)R350 with controlled pore sizes. The as-prepared catalysts were applied for both hydroconversion of cyclohexene with molecular H2 and ethanol dehydrogenation, using a flow-type reactor, at different temperatures. The activity in cyclohexene hydroconversion and selectivity to cyclohexane depended upon the reaction temperature; at t < 150 °C, the increased hydrogenation activity was referred to the formed SiO2–Ni–amine complex, pore regulation as a prime requirement for H2 storage and homogeneous distribution of incorporated Ni nanoparticles. At t > 150 °C, the backward dehydrogenation pathway was more favored, due to unavailability of H2; the process became structure-sensitive. In ethanol conversion, the prevailing dehydrogenation activity of organically modified catalyst samples was encouraged by improved homogeneous distribution of Ni nanoparticles and created micropre system. |
| format | Article |
| id | doaj-art-5040ba6125594595b97b93ed9077322d |
| institution | OA Journals |
| issn | 1110-0621 |
| language | English |
| publishDate | 2013-06-01 |
| publisher | Egyptian Petroleum Research Institute |
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| series | Egyptian Journal of Petroleum |
| spelling | doaj-art-5040ba6125594595b97b93ed9077322d2025-08-20T01:56:32ZengEgyptian Petroleum Research InstituteEgyptian Journal of Petroleum1110-06212013-06-0122117918810.1016/j.ejpe.2012.09.009Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanolSalah A. Hassan0Ahmed M. Al-Sabagh1Nasser H. Shalaby2Samia A. Hanafi3Hamdi A. Hassan4Department of Chemistry, Faculty of Science, Ain Shams University, Abbassia, Cairo, EgyptEgyptian Petroleum Research Institute, Nasr City 11727, Cairo, EgyptEgyptian Petroleum Research Institute, Nasr City 11727, Cairo, EgyptEgyptian Petroleum Research Institute, Nasr City 11727, Cairo, EgyptDepartment of Chemistry, Faculty of Science, Ain Shams University, Abbassia, Cairo, EgyptRice husk silica (RHS) was extracted from local rice husk by acid digestion and burning at 650 °C. RHS-Ni catalyst was prepared by dissolving RHS in 1 N NaOH and titrating with 3 N HNO3 containing 10 wt.% Ni2+. The organic modifiers, either p-amino benzoic acid (A) or p-phenylenediamine (PDA) were incorporated in 5 wt.% and reduced in H2 flow. Investigation of the three catalysts, (RHS-Ni)R350, (RHS-Ni–A)R350 and (RHS-Ni–PDA)R350, confirmed good dispersion of Ni nanoparticles; all catalysts were amorphous. The BET surface areas increased in the order: (RHS-Ni)R350 < (RHS-Ni–A)R350 < (RHS-Ni–PDA)R350 with controlled pore sizes. The as-prepared catalysts were applied for both hydroconversion of cyclohexene with molecular H2 and ethanol dehydrogenation, using a flow-type reactor, at different temperatures. The activity in cyclohexene hydroconversion and selectivity to cyclohexane depended upon the reaction temperature; at t < 150 °C, the increased hydrogenation activity was referred to the formed SiO2–Ni–amine complex, pore regulation as a prime requirement for H2 storage and homogeneous distribution of incorporated Ni nanoparticles. At t > 150 °C, the backward dehydrogenation pathway was more favored, due to unavailability of H2; the process became structure-sensitive. In ethanol conversion, the prevailing dehydrogenation activity of organically modified catalyst samples was encouraged by improved homogeneous distribution of Ni nanoparticles and created micropre system.http://www.sciencedirect.com/science/article/pii/S1110062112000608Rice husk silicaOrganically templated nano nickel-rice husk silicaCyclohexene hydroconversionDehydrogenation of ethanol |
| spellingShingle | Salah A. Hassan Ahmed M. Al-Sabagh Nasser H. Shalaby Samia A. Hanafi Hamdi A. Hassan Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol Egyptian Journal of Petroleum Rice husk silica Organically templated nano nickel-rice husk silica Cyclohexene hydroconversion Dehydrogenation of ethanol |
| title | Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol |
| title_full | Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol |
| title_fullStr | Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol |
| title_full_unstemmed | Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol |
| title_short | Catalytic performance of organically templated nano nickel incorporated-rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol |
| title_sort | catalytic performance of organically templated nano nickel incorporated rice husk silica in hydroconversion of cyclohexene and dehydrogenation of ethanol |
| topic | Rice husk silica Organically templated nano nickel-rice husk silica Cyclohexene hydroconversion Dehydrogenation of ethanol |
| url | http://www.sciencedirect.com/science/article/pii/S1110062112000608 |
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