![]() This arises due to inherent differences in Pd sites while exposed to these chemically distinct feeds. While only one major desorption event is observed for the full LTC-D, NO+ CO and NO+ unsaturated HC-controls, desorption occurs in two distinct stages for NO, NO + saturated HCs and initial-NO+H 2 trials. In addition to these quantitative differences, desorption behaviors are qualitatively different. Other controls did not exhibit trial-dependent deactivation as(NO:Pd)molar values were constant, at 0.3, 0.2, 0.5 and 0.2 for the NO, NO+H 2, NO + unsaturated hydrocarbon (C 2H 4, C 3H 6) and NO + saturated HC (C 3H 8, C 10H 22) feeds respectively. CO-induced particle formation and larger extent of particle sintering was also evident from TEM analysis. Control experiments showed more pronounced decline for NO + CO case, with appreciable intial (NO:Pd)molar value of 0.4 yet comparable-to-the-LTC-D-feed decline after 8 more » trials. NO-uptake studies in the presence of the LTC-D feed showed a systematic decline with (NO:Pd)molar changing from 0.5 to 0.4 after 10 trials. Notably as per the protocol conditions, 12% O 2 + 6% CO 2 + 6% H 2O was flown in all cases. Pd-functionalized chabazite (Pd/SSZ-13) was evaluated for passive NO x adsorption (PNA) using low temperature combustion with diesel (LTC-D) reaction feed of the “United States Driving Research and Innovation for Vehicle efficiency and Energy sustainability” (U.S.DRIVE) protocol.
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