Surface Properties and Catalytic Behavior of Rh Supported on CaO-SiO2 for carbon dioxide reforming of methane

B. FAROLDI, J. MÚNERA, E. FRUTIS, S. GONZÁLEZ CARRAZÁN, L. CORNAGLIA

Lyon

Congreso; 11th European Congress on Catalysis ? EuropaCat-XI,; 2013

Sociedad Europea de Catálisis

Rhodium catalysts were active for the dry reforming of methane reaction in membrane reactors [1]. Furthermore, when the La2O3-SiO2 support was used the Rh and Ru formulations were catalytically stable and did not produce carbonaceous residues. In this work, we report the results obtained with novel catalysts, Rh/CaO-SiO2. The fresh catalysts were characterized by XRD, TPR, FTIR and CO and hydrogen chemisorption. FTIR spectroscopy with CO as a probe molecule was used to study the promoter oxide role.Infrared spectra of adsorbed carbon monoxide can give valuable information about surface sites in mixed metal catalysts [2,3]. Knözinger and co-workers [2] studied the metal state on promoted Rh/SiO2 catalysts, finding that Rh(CO)2+ cations sit on the respective promoter oxide in Rh/X/SiO2 (X = Ta, Nb or V) . The SMSI state as induced by high temperature (HT) reduction gave rise to changes in the relative amount of linearly to bridge-bonded CO.