Journal of the Chemical Society - Faraday Transactions p. 1311 - 1320 (1992)
Update date:2022-08-11
Topics:
Trovarelli, Alessandro
Dolcetti, Giuliano
Leitenburg, Carla de
Kaspar, Jan
Finetti, Paola
Santoni, Antonino
The effects of the high-temperature reduction of Rh/CeO2 catalyst on the hydrogenation of CO, CO2, acetone and ethene, and on the hydrogenolysis of ethane, in transient and continuous conditions, have been investigated.The high-temperature reduction (HTR) at 773 K induced a transient Rh-CeO2 interaction in the catalyst which enhances the rate of CO, CO2 and acetone hydrogenation.Temperature-programmed reduction (TPR) and X-ray photoelectron spectroscopy (XPS) show the reduction of Ce4+ to Ce3+ after HTR in the near surface layers.We suggest that the oxygen vacancies on the support (i.e. presence of Ce3+) can interact with the CO moiety promoting its activation.
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