Abstract
Copper-zirconia catalysts have shown high activities and selectivities for a NOCO reaction at low temperature. Highly active Cu(L) species are produced by replacing the terminal OH groups of the ZrO 2 surface and assigned to atomically dispersed Cu species. The deactivation of Cu(L) species took place in two steps; relatively rapid activity loss and subsequent slow deterioration. Treatments with 1% NO regenerated the deactivated Cu ZrO 2 at a much lower temperature than treatments with 5% O 2. The addition of Fe to Cu ZrO 2 was found to dramatically improve the catalytic performances; the activity and selectivity to N 2 at low temperature and catalytic stability. The mechanisms of reaction, deactivation, and regeneration are proposed.
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