Effect of Rhodium Traces on the Reducibility of Silica-Supported Iron Particles

Eric Bonnefille , J. M. M. Millet (1) , J. P. Candy , J. Thivolle-Cazat , R. Bellabarba , R. Tooze , J. M. Basset

1 IRCELYON - Institut de recherches sur la catalyse et l'environnement de Lyon

Fe/SiO2 and Rh-Fe/SiO2 catalysts with increasing Fe/Rh ratio have been prepared and characterized by TEM, XRD, oxygen adsorption and Mossbauer spectroscopy. It was confirmed that Fe/SiO2 catalysts cannot be reduced under hydrogen flow, to more than 50 % whatever the temperature in the 200-500 A degrees C range and shown that the presence of even a small amount of Rh (Fe/Rh a parts per thousand currency sign2,000) promoted the reduction of iron up to 85-95 %. This promoting effect also took place with a Fe/SiO2 + Rh/SiO2 physical mixture (Fe/Rh a parts per thousand currency sign2,000). Therefore, the occurrence of a hydrogen spillover effect may be involved in the observed process.

Domaines: Catalyse; Environnement et Société

Eric Bonnefille, J. M. M. Millet, J. P. Candy, J. Thivolle-Cazat, R. Bellabarba, et al.. Effect of Rhodium Traces on the Reducibility of Silica-Supported Iron Particles. Catalysis Letters, 2012, 142, pp.984-990. ⟨10.1007/s10562-012-0853-x⟩. ⟨hal-00752599⟩