Paraskevi Panagiotopoulou
University of Patras
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Publication
Featured researches published by Paraskevi Panagiotopoulou.
Chemsuschem | 2015
Paraskevi Panagiotopoulou; Nickolas Martin; Dionisios G. Vlachos
The catalytic performance of homogeneous Lewis acid catalysts and their interaction with Ru/C catalyst are studied in the catalytic transfer hydrogenation of furfural by using 2-propanol as a solvent and hydrogen donor. We find that Lewis acid catalysts hydrogenate the furfural to furfuryl alcohol, which is then etherified with 2-propanol. The catalytic activity is correlated with an empirical scale of Lewis acid strength and exhibits a volcano behavior. Lanthanides are the most active, with DyCl3 giving complete furfural conversion and a 97 % yield of furfuryl alcohol at 180 °C after 3 h. The combination of Lewis acid and Ru/C catalysts results in synergy for the stronger Lewis acid catalysts, with a significant increase in the furfural conversion and methyl furan yield. Optimum results are obtained by using Ru/C combined with VCl3 , AlCl3 , SnCl4 , YbCl3 , and RuCl3 . Our results indicate that the combination of Lewis acid/metal catalysts is a general strategy for performing tandem reactions in the upgrade of furans.
Journal of Applied Electrochemistry | 2012
Maria Antoniadou; Paraskevi Panagiotopoulou; Dimitris I. Kondarides; Panagiotis Lianos
Photocatalytic mineralization of ethanol in the presence of oxygen has been studied in aqueous photocatalyst suspensions by employing either pure nanocrystalline titania or TiO2 combined with Pt, RuO2 or NiO co-catalysts. Combined photocatalysts demonstrated a diverse behavior. Highest mineralization rates were obtained with Pt/TiO2 and lowest with RuO2/TiO2 and NiO/TiO2. These results were related with the photocatalysts’ behavior when used as photoanodes for the production of electricity in a photoactivated fuel cell running with ethanol as fuel. The highest current was obtained with pure titania. The current dropped in the case of Pt/TiO2 and became much lower in the case of RuO2/TiO2 and NiO/TiO2 photoanodes. Both current and voltage were lower in the presence of oxygen than in its absence. It is concluded that the presence of electron scavengers, like O2, and/or the use of efficient photocatalysts, like titania-supported Pt, yield less electric power but assist ethanol mineralization process.
Journal of Catalysis | 2004
Paraskevi Panagiotopoulou; Dimitris I. Kondarides
Catalysis Today | 2006
Paraskevi Panagiotopoulou; Dimitris I. Kondarides
Journal of Catalysis | 2006
Paraskevi Panagiotopoulou; Antonios Christodoulakis; Dimitris I. Kondarides; Soghomon Boghosian
Applied Catalysis A-general | 2008
Paraskevi Panagiotopoulou; Dimitris I. Kondarides; Xenophon E. Verykios
Applied Catalysis B-environmental | 2009
Paraskevi Panagiotopoulou; Dimitris I. Kondarides; Xenophon E. Verykios
Journal of Catalysis | 2009
Christos M. Kalamaras; Paraskevi Panagiotopoulou; Dimitris I. Kondarides; Angelos M. Efstathiou
Chemical Engineering Journal | 2007
Paraskevi Panagiotopoulou; Joan Papavasiliou; George Avgouropoulos; Theophilos Ioannides; Dimitris I. Kondarides
Journal of Physical Chemistry C | 2011
Paraskevi Panagiotopoulou; Dimitris I. Kondarides; Xenophon E. Verykios