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Solid‐State NMR Study on Phosphorus Species in Phosphorus‐modified ZSM‐5 Zeolite
Author(s) -
Kang Na Young,
Park Yong Ki,
Kim Chul
Publication year - 2018
Publication title -
bulletin of the korean chemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.237
H-Index - 59
ISSN - 1229-5949
DOI - 10.1002/bkcs.11564
Subject(s) - magic angle spinning , zeolite , calcination , steaming , phosphorus , chemistry , solid state nuclear magnetic resonance , phosphorus 31 nmr spectroscopy , magic angle , aluminium , inorganic chemistry , nuclear magnetic resonance spectroscopy , catalysis , nuclear magnetic resonance , organic chemistry , physics , food science
Chemical changes of phosphorus‐modified ZSM‐5 zeolite in calcining and steaming processes were studied using solid‐state magic angle spinning nuclear magnetic resonance techniques. 1 H → 31 P cross‐polarization magic angle spinning and 31 P– 27 Al rotational‐echo double resonance signals of calcined and steamed P‐ZSM‐5 zeolites were measured and analyzed. Results showed that the average distance between phosphorus and hydrogens in phosphorus compounds was increased while the average distance between aluminum and phosphorus was decreased after the steaming process. Aluminum attached to highly condensed phosphates was protected in the zeolite framework during the steaming process.