Understanding Pd effects on NO storage and release is crucial for designing passive NO adsorber (PNA) to control NO emissions during diesel cold-starts. Herein, we report two oxidation states of Pd species on CeZrO regulated by metal-support interaction. Pd (0 < δ < 2) in Pd/CeZrO exhibits a high affinity for O adsorption, which promotes the oxidation of adsorbed NO to nitrates at 100 °C. These nitrates are thermally unstable due to electron transfer from the Pd atom to the N-O bond, facilitating the decomposition of nitrates to NO above 200 °C. In contrast, Pd in Pd/CeZrO prefer to NO adsorption. A large amount of adsorbed NO and nitrites accumulate on Pd and Ce results in high levels of NO release below 200 °C. For the potential application in PNA, Pd/CeZrO is recommended due to its proper NO release temperature as well as better water and SO resistance.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11555237 | PMC |
| http://dx.doi.org/10.1038/s44172-024-00311-3 | DOI Listing |
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