CO oxidation on Pd/CeO2–ZrO2 catalysts |
| |
Authors: | Elena Bekyarova Paolo Fornasiero Jan Kapar Mauro Graziani |
| |
Affiliation: | Dipartimento di Scienze Chimiche, Università di Trieste, via L.Giorgieri, 1 34127 Trieste Italy |
| |
Abstract: | The promotive effects of cerium oxide on commercial three-way catalysts (TWCs) for purification of motor exhaust gases have been widely investigated in recent years. This work shows the cooperative effects of CeO2–Pd on the kinetics of CO oxidation over Pd/CeO2–ZrO2. Under reducing-to-moderately oxidizing conditions, a zero-order O2 pressure dependence is found which can be interpreted on the basis of a mechanism involving a reaction between CO adsorbed on Pd and surface oxygen from the support. The high oxygen-exchange capability of the CeO2–ZrO2 support, as determined from temperature-programmed reduction/oxygen uptake measurements is suggested as being responsible for such a catalytic behavior. |
| |
Keywords: | CO oxidation CeO2–ZrO2 solid solution Redox properties |
本文献已被 ScienceDirect 等数据库收录! |