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metadata.dc.type: | Artigo de Periódico |
Title: | n‐octane reforming over alumina‐supported Pt, Pt–Sn and Pt–W catalysts |
Other Titles: | Catalysis Letters |
Authors: | Varela, Maria do Carmo Rangel Santos Carvalho, Luiz Souza Reyes, P. Parera, José Miguel Fígoli, N. S. |
metadata.dc.creator: | Varela, Maria do Carmo Rangel Santos Carvalho, Luiz Souza Reyes, P. Parera, José Miguel Fígoli, N. S. |
Abstract: | Pt, Pt–Sn and Pt–W supported on γ‐Al2O3 were prepared and characterized by H2 chemisorption, TEM, TPR, test reactions of n‐C8 reforming (500°C), cyclohexane dehydrogenation (315°C) and n‐C5 isomerization (500°C), and TPO of the used catalysts. Pt is completely reduced to Pt0, but only a small fraction of Sn and of W oxides are reduced to metal. The second element decreases the metallic properties of Pt (H2 chemisorption and dehydrogenation activity) but increases dehydrocyclization and stability. In spite of the large decrease in dehydrogenation activity of Pt in the bimetallics, the metallic function is not the controlling function of the bifunctional mechanisms of dehydrocyclization. Pt–Sn/Al2O3 is the best catalyst with the highest acid to metallic functions ratio (due to its lower metallic activity) presenting a xylenes distribution different from the other catalysts. The acid function of Pt–Sn/Al2O3 is tuned in order to increase isomerization and cyclization and to decrease cracking, as compared to Pt and Pt–W. |
Keywords: | bimetallic catalysts metal and acid functions n‐C8 reforming |
URI: | http://www.repositorio.ufba.br/ri/handle/ri/7962 |
Issue Date: | 2000 |
Appears in Collections: | Artigo Publicado em Periódico (Química) |
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