INQUIMAE   12526
INSTITUTO DE QUIMICA, FISICA DE LOS MATERIALES, MEDIOAMBIENTE Y ENERGIA
Unidad Ejecutora - UE
artículos
Título:
High activity mesoporous Pt/Ru catalysts for methanol oxidation
Autor/es:
E. A. FRANCESCHINI; M. A. BRUNO; F. WILLIAMS; F. A. VIVA; H.R. CORTI
Revista:
ACS APPLIED MATERIALS & INTERFACES
Editorial:
AMER CHEMICAL SOC
Referencias:
Lugar: Washington; Año: 2013 vol. 5 p. 10437 - 10444
ISSN:
1944-8244
Resumen:
High activity mesoporous Pt/Ru catalysts with 2D-hexagonal structure were
synthesized using a triblock poly(ethylene oxide)-b-poly(propylene oxide)-b-poly(ethylene
oxide) copolymer (Pluronic F127) template. The normalized mass activities for the methanol
oxidation reaction (MOR) of the Pt/Ru catalysts with a regular array of pores is higher than
those reported for nanoparticulated Pt/Ru catalysts. Different kinetic parameters, as Tafel
slope and activation energy, were obtained for the MOR on the mesoporous catalysts. Results
indicated that catalysts performance depends on pore size. Mass activities and the CO2
conversion efficiency for large pore size mesoporous catalysts (10 nm) are greater than those
reported for smaller pore size mesoporous catalysts with similar composition. The effect of
pore size on catalysts performance is related to the greater accessibility of methanol to the
active areas inside large pores. Consequently, the overall residence time of methanol increases
as compared with mesoporous catalyst with small pores.