Author： Bonnefille Eric Millet Jean-Marc Candy Jean-Pierre Thivolle-Cazat Jean Bellabarba Ronan Tooze Robert Basset Jean-Marie
Publisher： Springer Publishing Company
ISSN： 1011-372X
Source： Catalysis Letters, Vol.142, Iss.8, 2012-08, pp. : 984-990
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Abstract
Fe/SiO2 and Rh–Fe/SiO2 catalysts with increasing Fe/Rh ratio have been prepared and characterized by TEM, XRD, oxygen adsorption and Mössbauer 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 °C range and shown that the presence of even a small amount of Rh (Fe/Rh ≤2,000) 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 ≤2,000). Therefore, the occurrence of a hydrogen spillover effect may be involved in the observed process.
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