The relative surface affinities of pyridine within microporous HZSM-5 zeolites are explored
using two-dimensional 1H nuclear magnetic resonance (NMR) relaxation time …

Nuclear magnetic resonance (NMR) relaxation is an effective and non-invasive technique
for probing guest-host interactions in porous materials. In particular, the ratio of longitudinal …

The characterization of fluid/solid interactions in porous materials is crucial for their design
and optimization, most notably in applications such as adsorption and catalysis. Yet, probing …

The catalytic activity and selectivity of a Brønsted-acid site in a zeolite is affected not only by
the intrinsic strength of the site but also by the environment surrounding the site. Probing the …

A new methodology is reported for concurrent qualitative and quantitative characterization of
internal and external acid sites in zeolitic catalysts. H− ZSM-5 zeolites with varied Si/Al ratios …

The 1H magic-angle spinning nuclear magnetic resonance (1H MAS NMR) spectra of acidic
(bridging) hydroxyl (OH) groups on H-ZSM-5 zeolites were measured from room …

This work was aimed to evidence that substituted pyridine, 2, 6-di-tert-butylpyridine, is a
suitable probe for the quantitative investigation of the external acidity in hierarchically …

The identification of acid and nonacid species at the external surface of zeolites remains a
major challenge, in contrast to the extensively‐studied internal acid sites. Here, it is shown …

Elucidating the nature, strength, and siting of acid sites in zeolites is fundamental to fathom
their reactivity and catalytic behavior. Despite decades of research, this endeavor remains a …

Selecting the proper solvent is a major challenge involved in biomass conversion processes
as there is little predictive understanding of how solvent choice will affect reaction rates. To …