Journal
JOURNAL OF CATALYSIS
Volume 255, Issue 1, Pages 68-78Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcat.2008.01.028
Keywords
bronsted site; proton mobility; zeolites; ammonium; H-1 MAS NMR spectroscopy
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H-Y and H-ZSM-5 zeolites were investigated by H-1 MAS NMR spectroscopy over a wide range of temperatures (160-773 K). Signal broadening by up to a factor of 5 and signal narrowing by up to a factor of 40 could be assigned to different hydrogen-ex change reactions in the zeolites. We found that hydrogen forms of a zeolite containing ammonium ions represent ammonium-conducting materials, but in zeolites that were activated at temperatures above 673 K, the hopping of the hydrogen atoms between different aluminum sites ( SiOHAl ) is independent of proton vehicles. (c) 2008 Elsevier Inc. All rights reserved.
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