Abstract
The catalytic activity of Rh Al 2O 3 and Rh CeO 2 catalysts was investigated for the reduction of NO by CO under feed-composition cycling conditions as well as under steady feed conditions using a packed-bed reactor and an isotopic reactant, 13CO. Results indicate that the formation of N 2O is an important intermediate step during the (CO + NO) reaction over Rh Al 2O 3 . The enhanced catalytic activity of Rh CeO 2 compared with Rh Al 2O 3 under cyclic operating conditions is discussed in light of the oxygen storage capacity of ceria support. The effect of asymmetric cycling is examined in view of the nature of the rate-controlling step which changes with temperature. On the basis of our observations an overall reaction scheme is proposed for the (CO + NO) reaction over Rh Al 2O 3 in which N 2O is included as a reaction intermediate.
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