NOx Reduction on Fully Formulated Lean NOx Trap Catalysts Subjected to Simulated Road Aging: Insights from Steady-State Experiments

doi:10.1016/S1872-2067(10)60230-6

Abstract

Abstract: Fully formulated lean NO_x trap (LNT) catalysts of the type Pt/Rh/BaO/Al₂O₃ were prepared with and without incorporation of CeO₂-ZrO₂ in the washcoat, and their NO_x reduction behavior was evaluated in steady-state, continuous flow experiments. In the fresh state, CeO₂-ZrO₂ addition was found to exert little effect on NO_x reduction activity using H₂, CO, and NH₃ as the reductants. However, after simulated road aging, NO_x reduction activity was significantly impaired for the CeO₂-ZrO₂-free catalyst, whereas the performance of the CeO₂-ZrO₂-containing analog was affected to only a minor degree. These differences are explained on the basis of high-resolution transmission electron microscopy measurements showing that Pt supported on CeO₂-ZrO₂ remained highly dispersed after aging, whereas Pt supported on BaO/Al₂O₃ underwent significant sintering. In addition, the Pt/CeO₂-ZrO₂ component did not accumulate sulfur during aging, unlike Pt/BaO/Al₂O₃ for which significant sulfation of the Ba phase occurred. For both catalysts, selectivity to NH₃ in NO and NO₂ reduction by H₂ increased after catalyst aging, indicative of a change in the relative surface coverages of N and H ad-atoms on the precious metal sites.

Key words: lean NOx trap, NOx storage-reduction catalyst, steady state, NOx reduction, ceria-zirconia, catalyst aging

Jin WANG, Yaying JI, Uschi GRAHAM, Caio CESAR SPINDOLA DE OLIVEIRA, Mark CROCKER. NOx Reduction on Fully Formulated Lean NOx Trap Catalysts Subjected to Simulated Road Aging: Insights from Steady-State Experiments[J]. Chinese Journal of Catalysis, 2011, 32(5): 736-745.

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