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Synergic Effect of Active Sites in Zinc‐Modified ZSM‐5 Zeolites as Revealed by High‐Field Solid‐State NMR Spectroscopy
Author(s) -
Qi Guodong,
Wang Qiang,
Xu Jun,
Trébosc Julien,
Lafon Olivier,
Wang Chao,
Amoureux JeanPaul,
Deng Feng
Publication year - 2016
Publication title -
angewandte chemie
Language(s) - English
Resource type - Journals
eISSN - 1521-3757
pISSN - 0044-8249
DOI - 10.1002/ange.201608322
Subject(s) - chemistry , catalysis , active site , brønsted–lowry acid–base theory , nuclear magnetic resonance spectroscopy , spectroscopy , zinc , inorganic chemistry , solid state nuclear magnetic resonance , zsm 5 , metal , photochemistry , zeolite , stereochemistry , organic chemistry , nuclear magnetic resonance , physics , quantum mechanics
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.