ESTUDIO DE ESTABILIDAD DE CATALIZADORES DE Ni/CeO2-ZnAl2O4 EN EL REFORMADO DE ETANOL

AGUSTÍN E. GALETTI; MANUEL F. GOMEZ; LUIS A. ARRUA; MARIA CRISTINA ABELLO

Ubatuba, SP, Brasil

Workshop; Iberoamerican workshop on hydrogen and fuel cell; 2008

Ni catalysts have shown to be very active and selective in the steam reforming of ethanol for the production of hydrogen. These catalytic systems present as the main disadvantages its deactivation for carbon deposition, sintering and/or the inactive compound formation. The use of dopants is the usual way to increase the resistance to coque formation. Thus, the addition of Ce has shown positive effects due to it decreases the amount and modifies the form and nature of carbon deposits. In the literature the most of the data have been obtained under a high diluted feed and high W/FC2H5OH ratio which could hinder the deactivation process. In this work catalytic results in the ethanol steam reforming reaction on Ni supported over CeO2-ZnAl2O4 under more severe conditions were shown. The experimental conditions were 10 % of ethanol molar composition in the feed, 50 mg of catalyst without dilution and a molar ratio H2O: C2H5OH = 4.9. Under these conditions, the catalytic system was stable at 650°C and 35 h in time on stream. The ethanol conversion was 48% being the main products CO2, CO, C2H4O and low amount of CH4. The hydrogen productivity was 2.6 mol gcata-1 h-1.