Angewandte Chemie International Edition · 2016 · 79 citations · 34 references
Natural SciencesChemical EngineeringChemistryCatalysisSpectroscopySurface ChemistryCatalyst CharacterizationCatalytic MaterialsCatalytic MechanismsMetal-ligand BondingSupported CatalystsSurface CatalysisActive Site CharacterizationActive SitesBrønsted AcidityC-h Bond ActivationCatalyst Active SitesSynergic BondingZeolite CatalystsZeolites
Abstract Understanding the nature of active sites in metal‐supported catalysts is of great importance towards establishing their structure–property relationships. The outstanding catalytic performance of metal‐supported catalysts is frequently ascribed to the synergic effect of different active sites, which is however not well spectroscopically characterized. Herein, we report the direct detection of surface Zn species and 1 H– 67 Zn internuclear interaction between Zn 2+ ions and Brønsted acid sites on Zn‐modified ZSM‐5 zeolites by high‐field solid‐state NMR spectroscopy. The observed promotion of C−H bond activation of methane is rationalized by the enhanced Brønsted acidity generated by synergic effects arising from the spatial proximity/interaction between Zn 2+ ions and Brønsted acidic protons. The concentration of synergic active sites is determined by 1 H– 67 Zn double‐resonance solid‐state NMR spectroscopy.
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Yongye Liang, Yanguang Li, Hailiang Wang et al. · Nature Materials · 2011 · 5.4K citations · Full text
Synergistic Catalysis over Bimetallic Alloy Nanoparticles
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