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The state of Tin on Pt–Sn/Nb2O5 catalysts |
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| Authors: | Fabio B Passos Donato A G Aranda and Martin Schmal |
| Affiliation: | a Departamento de Engenharia Química, Universidade Federal Fluminense, R. Passos da Patria, 156, Niterói, RJ 24210-240, Brazil b NUCAT/COPPE-Universidade Federal do Rio de Janeiro Caixa Postal 68502, Rio de Janeiro, RJ 21945-970, Brazil c Escola de Química-Universidade Federal do Rio de Janeiro Caixa Postal 68542, Rio de Janeiro, RJ 21940-900, Brazil |
| Abstract: | The effect of tin addition on niobia supported catalysts was studied and compared to the properties of alumina supported bimetallic Pt–Sn catalysts. The catalyst surfaces were probed by methylcyclopentane conversion, showing that both the presence of Sn and the reduction of the support caused a decrease in hydrogenolysis activity, favoring the ring enlargement reaction. The thermodynamics of reduction of these systems, evaluated by following the reduction step (temperature programmed reduction — TPR) with a differential scanning calorimeter (DSC), and irreversible H2 and CO uptakes, allowed to conclude that a Pt–Sn alloy is formed on niobia supported catalysts. |
| Keywords: | Pt–Sn catalysts TPR DSC Niobia |
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