Effects of support and Rh additive on co-based catalysts in the ethanol steam reforming reaction

Zs Ferencz, A. Erdohelyi, K. Baán, A. Oszkó, L. Óvári, Z. Kónya, C. Papp, H. P. Steinrück, J. Kiss

Research output: Contribution to journalArticle

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Abstract

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 Co0 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.

Original languageEnglish
Pages (from-to)1205-1218
Number of pages14
JournalACS Catalysis
Volume4
Issue number4
DOIs
Publication statusPublished - Apr 4 2014

Fingerprint

Steam reforming
Reforming reactions
Catalyst supports
Hydrogen
Ethanol
Cerium compounds
Cobalt
Catalysts
Aluminum Oxide
Dehydration
Silicon Dioxide
Gas chromatography
Fourier transform infrared spectroscopy
Alumina
X ray photoelectron spectroscopy
Gases
Silica
Heating
Temperature

Keywords

  • cobalt-ceria catalyst
  • DRIFTS
  • ethanol steam reforming
  • ethoxide
  • hydrogen production
  • rhodium promoter
  • XPS

ASJC Scopus subject areas

  • Catalysis

Cite this

Effects of support and Rh additive on co-based catalysts in the ethanol steam reforming reaction. / Ferencz, Zs; Erdohelyi, A.; Baán, K.; Oszkó, A.; Óvári, L.; Kónya, Z.; Papp, C.; Steinrück, H. P.; Kiss, J.

In: ACS Catalysis, Vol. 4, No. 4, 04.04.2014, p. 1205-1218.

Research output: Contribution to journalArticle

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