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Catalysts 2016, 6(3), 39; doi:10.3390/catal6030039

Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship

1
School of Production Engineering and Management, Technical University of Crete, GR-73100 Chania, Crete, Greece
2
Department of Mechanical Engineering, University of Western Macedonia, Bakola & Sialvera, GR-50100 Kozani, Greece
3
Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas, 6th km. Charilaou—Thermi Rd., P.O. Box 60361, GR-57001 Thermi, Thessaloniki, Greece
4
Department of Environmental Engineering, University of Western Macedonia, Bakola & Sialvera, GR-50100 Kozani, Greece
*
Author to whom correspondence should be addressed.
Academic Editor: Keith Hohn
Received: 30 November 2015 / Revised: 18 February 2016 / Accepted: 2 March 2016 / Published: 8 March 2016
(This article belongs to the Special Issue Surface Chemistry and Catalysis)
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Abstract

The aim of the present work was to investigate steam reforming of ethanol with regard to H2 production over transition metal catalysts supported on CeO2. Various parameters concerning the effect of temperature (400–800 °C), steam-to-carbon (S/C) feed ratio (0.5, 1.5, 3, 6), metal entity (Fe, Co, Ni, Cu) and metal loading (15–30 wt.%) on the catalytic performance, were thoroughly studied. The optimal performance was obtained for the 20 wt.% Co/CeO2 catalyst, achieving a H2 yield of up to 66% at 400 °C. In addition, the Co/CeO2 catalyst demonstrated excellent stability performance in the whole examined temperature range of 400–800 °C. In contrast, a notable stability degradation, especially at low temperatures, was observed for Ni-, Cu-, and Fe-based catalysts, ascribed mainly to carbon deposition. An extensive characterization study, involving N2 adsorption-desorption (BET), X-ray diffraction (XRD), Scanning Electron Microscopy (SEM/EDS), X-ray Photoelectron Spectroscopy (XPS), and Temperature Programmed Reduction (H2-TPR) was undertaken to gain insight into the structure-activity correlation. The excellent reforming performance of Co/CeO2 catalysts could be attributed to their intrinsic reactivity towards ethanol reforming in combination to their high surface oxygen concentration, which hinders the deposition of carbonaceous species. View Full-Text
Keywords: ethanol steam reforming; H2 production; ceria-based catalysts; iron; cobalt; nickel; copper; XPS; H2-TPR; stability ethanol steam reforming; H2 production; ceria-based catalysts; iron; cobalt; nickel; copper; XPS; H2-TPR; stability
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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MDPI and ACS Style

Konsolakis, M.; Ioakimidis, Z.; Kraia, T.; Marnellos, G.E. Hydrogen Production by Ethanol Steam Reforming (ESR) over CeO2 Supported Transition Metal (Fe, Co, Ni, Cu) Catalysts: Insight into the Structure-Activity Relationship. Catalysts 2016, 6, 39.

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