Published in
Wiley, Angewandte Chemie International Edition, 46(49), p. 8657-8661, 2010
Wiley, Angewandte Chemie, 46(122), p. 8839-8843, 2010
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Insights into the Dealumination of Zeolite HY Revealed by Sensitivity-Enhanced 27Al DQ-MAS NMR Spectroscopy at High Field
Journal article published in 2010 by
Zhiwu Yu,
Anmin Zheng 
,
Qiang Wang,
Lei Chen,
Jun Xu,
Jean-Paul Amoureux,
Feng Deng
,
Qiang Wang,
Lei Chen,
Jun Xu,
Jean-Paul Amoureux,
Feng Deng
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Abstract
A zeolite dealumination mechanism is proposed on the basis of sensitivity-enhanced 27Al DQ-MAS NMR spectra (see picture), which revealed for the first time the detailed evolution of extra-framework aluminum (EFAL) species and the spatial proximities of various aluminum species in dealuminated HY zeolites. Three types of EFAL species in close proximity to framework aluminum were identified.