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In Situ Multinuclear Magic-Angle Spinning NMR: Monitoring Crystallization of Molecular Sieve AlPO4-11 in Real Time.
| Content Provider | Europe PMC |
|---|---|
| Author | Alahakoon, SandaminiH. Willans, Mathew J. Huang, Yining |
| Copyright Year | 2023 |
| Abstract | Molecular sieves are crystalline three-dimensional frameworkswithwell-defined channels and cavities. They have been widely used inindustry for many applications such as gas separation/purification,ion exchange, and catalysis. Obviously, understanding the formationmechanisms is fundamentally important. High-resolution solid-stateNMR spectroscopy is a powerful method for the study of molecular sieves.However, due to technical challenges, the vast majority of the high-resolutionsolid-state NMR studies on molecular sieve crystallization are exsitu. In the present work, using a new commercially available NMRrotor that can withhold high pressure and high temperature, we examinedthe formation of molecular sieve AlPO4-11 under dry gelconversion conditions by in situ multinuclear (1H, 27Al, 31P, and 13C) magic-angle spinning(MAS) solid-state NMR. In situ high-resolution NMR spectra obtainedas a function of heating time provide much insights underlying thecrystallization mechanism of AlPO4-11. Specifically, insitu 27Al and 31P MAS NMR along with 1H → 31P cross-polarization (CP) MAS NMR were usedto monitor the evolution of the local environments of framework Aland P, in situ 1H → 13C CP MAS NMR tofollow the behavior of the organic structure directing agent, andin situ 1H MAS NMR to unveil the effect of water contenton crystallization kinetics. The in situ MAS NMR results lead to abetter understanding of the formation of AlPO4-11. |
| Related Links | https://europepmc.org/backend/ptpmcrender.fcgi?accid=PMC10302754&blobtype=pdf |
| Journal | JACS Au |
| Volume Number | 3 |
| DOI | 10.1021/jacsau.3c00109 |
| PubMed Central reference number | PMC10302754 |
| Issue Number | 6 |
| PubMed reference number | 37388699 |
| e-ISSN | 26913704 |
| Language | English |
| Publisher | American Chemical Society |
| Publisher Date | 2023-05-09 |
| Access Restriction | Open |
| Rights License | Permits non-commercial access and re-use, provided that author attribution and integrity are maintained; but does not permit creation of adaptations or other derivative works (https://creativecommons.org/licenses/by-nc-nd/4.0/). © 2023 The Authors. Published by American Chemical Society |
| Subject Keyword | molecular sieves AlPO4-11 in situmultinuclear NMR spectroscopy crystallization |
| Content Type | Text |
| Resource Type | Article |
| Subject | Chemistry Physical and Theoretical Chemistry Analytical Chemistry Organic Chemistry |
