Characterization of the activity and stability of supported cobalt catalysts for the steam reforming of ethanol

This paper reports results of studies of the catalytic activity and stability of supported cobalt catalysts for steam reforming of ethanol. Co/Al 2O 3, Co/SiO 2, and Co/MgO catalysts were prepared by an impregnation method and characterized by X-ray diffraction, atomic absorption spectroscopy, Raman...

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Bibliographic Details
Published inJournal of power sources Vol. 124; no. 1; pp. 99 - 103
Main Authors Batista, Marcelo S, Santos, Rudye K.S, Assaf, Elisabete M, Assaf, José M, Ticianelli, Edson A
Format Journal Article
LanguageEnglish
Published Lausanne Elsevier B.V 01.10.2003
Elsevier Sequoia
Subjects
Applied sciences
Cobalt catalyst
Energy
Energy. Thermal use of fuels
Equipments for energy generation and conversion: thermal, electrical, mechanical energy, etc
Ethanol
Exact sciences and technology
Fuel cell
Fuel cells
Hydrogen production
Steam reforming
Steam reforming
Cobalt catalyst
Ethanol
Hydrogen production
Fuel cell
Alcohol fuel cells
Cobalt
Supported catalyst
Characterization
Raman spectrometry
X ray diffractometry
Catalyst activity
X ray absorption
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Summary:This paper reports results of studies of the catalytic activity and stability of supported cobalt catalysts for steam reforming of ethanol. Co/Al 2O 3, Co/SiO 2, and Co/MgO catalysts were prepared by an impregnation method and characterized by X-ray diffraction, atomic absorption spectroscopy, Raman spectroscopy, and temperature programmed reduction with hydrogen. The results showed the presence of Co 3O 4 and CoO x species interacting with Al 2O 3 or MgO and formed after a calcination step. It was evident that only Co 0 sites are active for the steam reforming of ethanol. All materials showed high levels of ethanol conversion, with molar yields of about 70% of hydrogen and 30% of CO+CO 2+CH 4 in the gaseous mixture. The Co/Al 2O 3 catalyst also produced ethylene through a dehydration reaction of ethanol. It is proposed that the methane formation on Co/SiO 2 catalysts occurs by methanation of CO and by ethanol decomposition. After 9 h of reaction, 14–24% (w/w) of carbon was deposited on all catalysts, indicating that a well characterized deactivation of the materials is due to coke deposition.
ISSN:0378-7753
1873-2755
DOI:10.1016/S0378-7753(03)00599-8