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PFG‐NMR as a Tool for Determining Self‐Diffusivities of Various Probe Molecules through H‐ZSM‐5 Zeolites
Author(s) -
Bingre Rogéria,
Losch Pit,
MegíasSayago Cristina,
Vincent Bruno,
Pale Patrick,
Nguyen Patrick,
Louis Benoît
Publication year - 2019
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.201900672
Subject(s) - zeolite , microporous material , pulsed field gradient , chemistry , molecule , thermal diffusivity , molecular sieve , zsm 5 , diffusion , nuclear magnetic resonance spectroscopy , molecular diffusion , spectroscopy , benzene , toluene , analytical chemistry (journal) , chemical physics , catalysis , adsorption , organic chemistry , thermodynamics , metric (unit) , physics , operations management , quantum mechanics , economics
The understanding of major zeolite applications is partially based on diffusion of molecules inside or outside microporous networks. However, it is still a challenge to measure such phenomena. The diffusion ordered nuclear magnetic resonance spectroscopy (DOSY) technique has been reported to measure a probe molecule‘s diffusion inside porous solids. Pulsed‐field gradient (PFG)‐NMR has been used herein to measure the self‐diffusivity of different probe molecules, such as neopentane, benzene, toluene and 1‐dodecene with increasing dynamic diameter, respectively, on a series of H‐ZSM‐5 zeolites. The latter materials exhibit different crystal sizes, Si/Al ratios and the presence (or absence) of crystalline defects. In addition, shaped zeolite bodies representing industrial catalysts were compared with the afore‐mentioned samples.