Single-Atom Mn Catalysts for Selective C=C Bond Cleavage under Mild Photocatalytic Conditions
Palavras-chave:
Carbon nitride, Single-atom catalysis, ozonolysisResumo
This work explores single-atom Mn anchored in poly(heptazine imide) (PHI) for photocatalytic oxidative cleavage of C=C bonds. Mn-PHI materials were synthesized via cationic exchange of Na-PHI and characterized by XRD, XAS, EPR, HAADF-STEM, confirming Mn dispersion as single-atoms at low loadings (0.5–1%) and clusters at higher concentrations. Photocatalytic tests revealed Mn-PHI_0.5 achieves 100% conversion of cis-stilbene and 100% benzaldehyde selectivity, while higher Mn loadings reduce performance due to cluster and/or nanoparticle formation. The results highlight the superiority of single-atom catalysts for selective C=C bond cleavage under mild conditions.
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