Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes
Catalytic reforming accounts for a large share of the world’s gasoline production, it is the most important source of aromatics for the petrochemical industry. In addition, reforming of hydrocarbon on the dual-function catalysts has been found to form fundamentally different products in hydrogen dil...
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Egyptian Petroleum Research Institute
2015-06-01
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| Series: | Egyptian Journal of Petroleum |
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| Online Access: | http://www.sciencedirect.com/science/article/pii/S1110062115000318 |
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| author | A.H. Samia M.S. Mohammed S. Faramawy S.A. Ahmed H.B. Ahmed |
| author_facet | A.H. Samia M.S. Mohammed S. Faramawy S.A. Ahmed H.B. Ahmed |
| author_sort | A.H. Samia |
| collection | DOAJ |
| description | Catalytic reforming accounts for a large share of the world’s gasoline production, it is the most important source of aromatics for the petrochemical industry. In addition, reforming of hydrocarbon on the dual-function catalysts has been found to form fundamentally different products in hydrogen diluents. Typical catalysts employed for this reforming process are Pt/Al2O3 and Pt-M/Al2O3, M being the promoter. These solids are characterized by both acid and metal functions which catalyze dehydrocyclization, dehydrogenation, isomerization and cracking processes. In this regard, information about cerium and lanthanum, as promoters, is hardly revealed. The present work aims to study the performance of Pt/Al2O3 catalysts modified by lanthanum or cerium during the conversion of cyclohexane, n-hexane and n-heptane. Catalytic activities of the prepared catalysts were tested using a micro catalytic pulse technique. Physicochemical characterization of the solid catalysts such as, surface area (SBET), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), hydrogen-temperature programed reduction (H2-TPR), hydrogen-temperature-programed desorption (H2-TPD), CO2-TPD, NH3-TPD, high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) were depicted. Results indicated clearly that Pt/Al2O3 catalyst is selective toward dehydrogenation to benzene which could be explained as due to the decrease in the active acid sites and the comparative segregation of the alumina support especially at 3% load of CeO. The presence of La2O3 in the Pt/Al2O3 catalyst promotes aromatization of n-hexane and n-heptane, also the dehydrocyclization of n-hexane is more difficult than that of n-heptane. Thus, modification of the Pt/Al2O3 catalyst by La, resulted in a more active and selective reforming catalyst. |
| format | Article |
| id | doaj-art-5ee72b7e403c4cb4996fb62dbef1741d |
| institution | DOAJ |
| issn | 1110-0621 |
| language | English |
| publishDate | 2015-06-01 |
| publisher | Egyptian Petroleum Research Institute |
| record_format | Article |
| series | Egyptian Journal of Petroleum |
| spelling | doaj-art-5ee72b7e403c4cb4996fb62dbef1741d2025-08-20T03:04:42ZengEgyptian Petroleum Research InstituteEgyptian Journal of Petroleum1110-06212015-06-0124216317410.1016/j.ejpe.2015.05.007Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanesA.H. Samia0M.S. Mohammed1S. Faramawy2S.A. Ahmed3H.B. Ahmed4Egyptian Petroleum Research Institute, Nasr City 11727, 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, EgyptFaculty of Science, AL-Azhar University, Cairo, EgyptCatalytic reforming accounts for a large share of the world’s gasoline production, it is the most important source of aromatics for the petrochemical industry. In addition, reforming of hydrocarbon on the dual-function catalysts has been found to form fundamentally different products in hydrogen diluents. Typical catalysts employed for this reforming process are Pt/Al2O3 and Pt-M/Al2O3, M being the promoter. These solids are characterized by both acid and metal functions which catalyze dehydrocyclization, dehydrogenation, isomerization and cracking processes. In this regard, information about cerium and lanthanum, as promoters, is hardly revealed. The present work aims to study the performance of Pt/Al2O3 catalysts modified by lanthanum or cerium during the conversion of cyclohexane, n-hexane and n-heptane. Catalytic activities of the prepared catalysts were tested using a micro catalytic pulse technique. Physicochemical characterization of the solid catalysts such as, surface area (SBET), Fourier transform infrared (FTIR), differential scanning calorimetry (DSC), thermogravimetric analysis (TGA), hydrogen-temperature programed reduction (H2-TPR), hydrogen-temperature-programed desorption (H2-TPD), CO2-TPD, NH3-TPD, high resolution transmission electron microscopy (HRTEM) and X-ray diffraction (XRD) were depicted. Results indicated clearly that Pt/Al2O3 catalyst is selective toward dehydrogenation to benzene which could be explained as due to the decrease in the active acid sites and the comparative segregation of the alumina support especially at 3% load of CeO. The presence of La2O3 in the Pt/Al2O3 catalyst promotes aromatization of n-hexane and n-heptane, also the dehydrocyclization of n-hexane is more difficult than that of n-heptane. Thus, modification of the Pt/Al2O3 catalyst by La, resulted in a more active and selective reforming catalyst.http://www.sciencedirect.com/science/article/pii/S1110062115000318DehydrogenationDehydrocyclizationLa, Ce promotionPt/Al2O3Characterization |
| spellingShingle | A.H. Samia M.S. Mohammed S. Faramawy S.A. Ahmed H.B. Ahmed Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes Egyptian Journal of Petroleum Dehydrogenation Dehydrocyclization La, Ce promotion Pt/Al2O3 Characterization |
| title | Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes |
| title_full | Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes |
| title_fullStr | Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes |
| title_full_unstemmed | Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes |
| title_short | Influence of Pt nanoparticles modified by La and Ce oxides on catalytic dehydrocyclization of n-alkanes |
| title_sort | influence of pt nanoparticles modified by la and ce oxides on catalytic dehydrocyclization of n alkanes |
| topic | Dehydrogenation Dehydrocyclization La, Ce promotion Pt/Al2O3 Characterization |
| url | http://www.sciencedirect.com/science/article/pii/S1110062115000318 |
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