Insights into the Dealumination of Zeolite HY Revealed by Sensitivity‐Enhanced ²⁷Al DQ‐MAS NMR Spectroscopy at High Field

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. Detailed facts of importance to specialist readers are published as ”Supporting Information”. Such documents are peer-reviewed, but not copy-edited or typeset. They are made available as submitted by the authors. Please note: The publisher is not responsible for the content or functionality of any supporting information supplied by the authors. Any queries (other than missing content) should be directed to the corresponding author for the article.