Synergic Effect of Active Sites in Zinc‐Modified ZSM‐5 Zeolites as Revealed by High‐Field Solid‐State NMR Spectroscopy |
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| Authors: | Dr Guodong Qi Dr Qiang Wang Prof Jun Xu Dr Julien Trébosc Prof Olivier Lafon Dr Chao Wang Prof Jean‐Paul Amoureux Prof Feng Deng |
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| Affiliation: | 1. http://denggroup.org/;2. National Centre for Magnetic Resonance in Wuhan, State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, CAS Key Laboratory of Magnetic Resonance in Biological Systems, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, China;3. Univ. Lille, CNRS, ENSCL, UMR 8181, Unité de Catalyse et de Chimie du Solide, Lille, France;4. East China Normal University, Shanghai, China |
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| 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 1H–67Zn internuclear interaction between Zn2+ 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 Zn2+ ions and Brønsted acidic protons. The concentration of synergic active sites is determined by 1H–67Zn double‐resonance solid‐state NMR spectroscopy. |
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| Keywords: | active sites C− H bond activation solid-state NMR spectroscopy synergic effects zinc-modified zeolite |
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