Journal
ACS CATALYSIS
Volume 4, Issue 4, Pages 1205-1218Publisher
AMER CHEMICAL SOC
DOI: 10.1021/cs500045z
Keywords
ethanol steam reforming; hydrogen production; cobalt-ceria catalyst; rhodium promoter; ethoxide; DRIFTS; XPS
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Funding
- Alexander von Humboldt Foundation within the Research Group Linkage Programme
- COST Action Nanoalloy [MP0903]
- Cluster of Excellence Engineering of Advanced Materials
- [TAMOP-4.2.2.A-11/1/KONV-2012-0047]
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The effect of the nature of the support and the promotion achieved by a Rh additive on Co-based catalysts in the ethanol steam reforming reaction were studied. The catalysts with 2% Co loading were characterized by temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS). In situ diffuse reflectance Fourier-transform infrared spectroscopy (DRIFTS) identified the surface intermediates formed during the reaction, whereas gas phase products were detected by gas chromatography (GC). Upon heating in hydrogen to 773 K, cobalt could not be reduced to Co-0 on alumina, but on silica the reduction was almost complete. On ceria, half of the Co could be reduced to the metallic state. By the presence of a small amount (0.1%) of Rh promoter, the reduction of both cobalt and ceria was greatly enhanced. For Co on the acidic Al2O3 support, the dehydration mechanism was dominant, although on the basic CeO2 support, a significant amount of hydrogen was also formed. Addition of a small amount of Rh as promoter to the Co/CeO2 catalyst resulted in a significant further increase in the hydrogen selectivity.
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