1. Ruthenium Clusters on Carbon Nanofibers for Formic Acid Decomposition: Effect of Doping the Support with Nitrogen.
- Author
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Zacharska, Monika, Podyacheva, Olga Yu., Kibis, Lidiya S., Boronin, Andrey I., Senkovskiy, Boris V., Gerasimov, Evgeny Yu., Taran, Oxana P., Ayusheev, Artemiy B., Parmon, Valentin N., Leahy, J. J., and Bulushev, Dmitri A.
- Subjects
CARBON nanofibers ,FORMIC acid ,RUTHENIUM ,NITROGEN ,CHEMICAL decomposition ,SEMICONDUCTOR doping profiles ,DEHYDROGENATION ,HYDROGEN production - Abstract
The catalytic properties of 1 wt % Ru catalysts with the same mean Ru cluster size of 1.4-1.5 nm supported on herringbone-type carbon nanofibers with different N contents were compared for H
2 production from formic acid decomposition. The Ru catalyst on the support with 6.8 wt % N gave a 1.5-2 times higher activity for the dehydrogenation reaction (CO2 , H2 ) than the catalyst on the undoped support. The activity in the dehydration reaction (CO, H2 O) was the same. As a result, the selectivity to H2 increased significantly from 83 to 92 % with N-doping, and the activation energies for both reactions were close (55-58 kJ mol−1 ). The improvement could be explained by the presence of Ru clusters stabilized by pyridinic N located on the open edges of the external surface of the carbon nanofibers. This N may activate formic acid by the formation of an adduct (>NH+ HCOO− ) followed by its dehydrogenation on the adjacent Ru clusters. [ABSTRACT FROM AUTHOR]- Published
- 2015
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