INVESTIGADORES
AMADEO Norma Elvira
artículos
Título:
.Ethanol steam reforming over Rh(1%)MgAl2O4/Al2O3 . A kinetic study
Autor/es:
CECILIA GRASCHINSKY; MIGUEL LABORDE; NORMA AMADEO; ANTHONY LE VALANT; NICOLAS BION; FLORENCE EPRON; DANIEL DUPREZ
Revista:
INDUSTRIAL & ENGINEERING CHEMICAL RESEARCH
Editorial:
AMER CHEMICAL SOC
Referencias:
Año: 2010 vol. 49 p. 12383 - 12389
ISSN:
0888-5885
Resumen:
A kinetic study of ethanol steam-reforming reaction on Rh catalyst supported over a spinel structure (MgAl2O4/Al2O3) was carried out. From the analysis of products distribution, the following four reactions were proposedas the reaction scheme: C2H5OH f CO + CH4 + H2 (ED), C2H5OH + H2O f CO2 + CH4 + 2H2 (ER),water-gas shift reaction, and methane steam-reforming reaction. When the initial rate method was applied,it was demonstrated that in the rate-determining step (RDS) two active sites of the same type are involved.With use of our experimental results and data obtained from the literature, a sequence of 14 elementary stepswere proposed, in agreement with the reaction scheme. Taking into account both the reaction mechanism andthe occurrence of two active sites in the RDS, four different kinetic expressions can be formulated in whichthe RDS is (1) dissociative adsorption of ethanol, (2) dehydrogenation of ethoxide, (3) C-C bond scission,or (4) reaction between two adsorbed species. Finally, when discrimination models were applied, it was verifiedthat the mechanism that fits experimental data is that in which the RDS is the surface reaction.