INCAPE 05401
INSTITUTO DE INVESTIGACIONES EN CATALISIS Y PETROQUIMICA "ING. JOSE MIGUEL PARERA"
Unidad Ejecutora - UE
artículos
Título:
Raman in situ characterization of the species present in Co/CeO2 and Co/ZrO2 catalysts during the COPrOx reaction
Autor/es:
LETICIA GOMEZ; JOHN MUNERA; BRENDA SOLLIER; EDUARDO MIRO; ALICIA BOIX
Revista:
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Editorial:
PERGAMON-ELSEVIER SCIENCE LTD
Referencias:
Lugar: Amsterdam; Año: 2015
ISSN:
0360-3199
Resumen:
The in situ Raman spectroscopy constitutes a powerful procedure to characterize catalytic surfaces under reaction conditions. In this work, we studied the species present in Co/CeO2 and Co/ZrO2 catalysts during the COPrOx reaction carried out between room temperature and 500 C. For both catalysts, TPR and Raman results suggest that a redox mechanism proceeds in which the reduction step with either hydrogen or CO is the rate-limiting step. The CeO2 support is better than the ZrO2 one because the former accelerates the surface exchange between reduced and oxidized species due to the high mobility of surface lattice oxygen and the presence of oxygen vacancies. The Ce4þ þ Co2þ 4 Ce3þ þ Co3þ process acts as a buffer effect by which Co3þ, which is the active species in this reaction, is always present even in a reducing atmosphere, as shown by in situ Raman characterization.
