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Production of hydrogen by ethanol steam reforming on Co/Al2O3 catalysts: Effect of addition of small quantities of noble metals

2007; Elsevier BV; Volume: 175; Issue: 1 Linguagem: Inglês

10.1016/j.jpowsour.2007.09.050

1873-2755

Luciene Paula Roberto Profeti, Edson A. Ticianelli, Elisabete M. Assaf,

Catalysis and Hydrodesulfurization Studies

The catalytic performance of Co/Al2O3 catalysts promoted with small amounts noble metals (Pt, Pd, Ru, Ir) for steam reforming of ethanol (SRE) has been investigated. The catalysts were characterized by the energy dispersive X-ray, X-ray diffraction, BET surface area, X-ray absorption fine structure and temperature reduction programmed techniques. The results showed that the promoting effect of noble metals included a marked decrease of the reduction temperatures of both Co3O4 and cobalt surface species interacting with the support due to the hydrogen spillover effect, leading to a significant increase of the reducibilities of the promoted catalysts. The better catalytic performance for the ethanol steam reforming at 400 °C was obtained for the CoRu/Al2O3 catalyst, which presented an effluent gaseous mixture with the highest H2 selectivity and the reasonable low CO formation.