Insights into the Catalytic Activity of Nitridated Fibrous Silica (KCC-1) Nanocatalysts from N-15 and Si-29 NMR Spectroscopy Enhanced by Dynamic Nuclear Polarization

abstract

Fibrous nanosilica (KCC-1) oxynitrides are promising solid-base catalysts. Paradoxically, when their nitrogen content increases, their catalytic activity decreases. This counterintuitive observation is explained here for the first time using N-15-solid-state NMR spectroscopy enhanced by dynamic nuclear polarization.

keywords

SOLID-STATE NMR; MESOPOROUS MATERIALS; SURFACE; AMMONIA; NANOPARTICLES; AMMONOLYSIS; SBA-15; MCM-41

subject category

Chemistry

authors

Thankamony, ASL; Lion, C; Pourpoint, F; Singh, B; Linde, AJP; Carnevale, D; Bodenhausen, G; Vezin, H; Lafon, O; Polshettiwar, V

our authors

Groups

acknowledgements

This work was supported by the Region Nord/Pas de Calais, the European Union (FEDER), the CNRS, the French ministry of research, USTL, ENSCL, contracts ANR-2020-jcjc-0811-01, CEFIPRA no5208-E, COST TD 1103, the Swiss National Science Foundation, the Swiss Commission for Technology and Innovation, the EPFL, and Bruker Biospin. V.P. thanks the Department of Atomic Energy (DAE), Government of India for a start-up grant at Tata Institute of Fundamental Research (TIFR), Mumbai.

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