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Mechanistic pathways for NO dissociation: (a) Direct NO dissociation on Pd3/CeO2, (b) direct NO dissociation on Pd3/CeO2_VO, (c) H-assisted NO dissociation on Pd3/CeO2, and (d) NO dissociation via the N2O2 dimer pathway on Pd3/CeO2 (color code: gray, Ce; pink and red, O; blue, N; turquoise, Pd; white, H). The dashed circles represent surface oxygen vacancies.
