The CO hydrogenation over Rh/SiO2-CeO2 was investigated kinetically in order to find the rate equation as a function of CO and H2 partial pressures. Relative to previous findings obtained with Rh/SiO2 a fairly higher dependence on adsorbed CO is evident. Together with additional evidences found by TPD/TPR and IR spectroscopy, this higher dependence has been tentatively associated to a CO in which both the carbon and the oxygen ends are bonded to Rh and Ce3C, respectively. The influence of the support has been emphasized in order to ascertain the role of CeO2 (promoter) relative to Rh/SiO2. In agreement with previous findings we have found that with Rh/SiO2-CeO2 catalysts, the promoter inhibits the total activity while favoring the formation of EtOH.
Hydrogenation of CO over Rh/SiO2-CeO2 catalyst: kinetic evidences
MAZZOCCHIA, CARLO VITTORIO;GRONCHI, PAOLO;
2001-01-01
Abstract
The CO hydrogenation over Rh/SiO2-CeO2 was investigated kinetically in order to find the rate equation as a function of CO and H2 partial pressures. Relative to previous findings obtained with Rh/SiO2 a fairly higher dependence on adsorbed CO is evident. Together with additional evidences found by TPD/TPR and IR spectroscopy, this higher dependence has been tentatively associated to a CO in which both the carbon and the oxygen ends are bonded to Rh and Ce3C, respectively. The influence of the support has been emphasized in order to ascertain the role of CeO2 (promoter) relative to Rh/SiO2. In agreement with previous findings we have found that with Rh/SiO2-CeO2 catalysts, the promoter inhibits the total activity while favoring the formation of EtOH.| File | Dimensione | Formato | |
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