Probing the porosity of cocrystallized MCM-49/ZSM-35 zeolites by hyperpolarized 129Xe NMR

The Journal of Physical Chemistry. B
Yong LiuXinhe Bao

Abstract

One- and two-dimensional 129Xe NMR spectroscopy has been employed to study the porosity of cocrystallized MCM-49/ZSM-35 zeolites under the continuous flow of hyperpolarized xenon gas. It is found by variable-temperature experiments that Xe atoms can be adsorbed in different domains of MCM-49/ZSM-35 cocrystallized zeolites and the mechanically mixed counterparts. The exchange of Xe atoms in different types of pores is very fast at ambient temperatures. Even at very low temperature two-dimensional exchange spectra (EXSY) show that Xe atoms still undergo much faster exchange between MCM-49 and ZSM-35 analogues in the cocrystallized zeolites than in the mechanical mixture. This demonstrates that the MCM-49 and ZSM-35 analogues in cocrystallized zeolites may be stacked much closer than in the physical mixture, and some parts of intergrowth may be formed due to the partially similar basic structure of MCM-49 and ZSM-35.

References

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Nov 1, 2005·Solid State Nuclear Magnetic Resonance·Kevin KnaggeDaniel Raftery
Jul 27, 2006·The Journal of Physical Chemistry. B·Shing-Jong HuangShang-Bin Liu

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Citations

Jun 19, 2010·International Journal of Molecular Sciences·Zaiku XieWeiping Ding
Jan 15, 2014·Progress in Nuclear Magnetic Resonance Spectroscopy·Christian BonhommeDanielle Laurencin
Oct 7, 2016·Chemistry : a European Journal·Danila A BarskiyEduard Y Chekmenev
Aug 3, 2019·Nature Communications·Yu-Zhen ChenHai-Long Jiang
Sep 10, 2009·Journal of the American Chemical Society·Shutao XuXinhe Bao
Jul 4, 2009·Journal of the American Chemical Society·Lama ItaniValentin Valtchev

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