Saturation, of the Siliceous Zeolite TON with Neon at High Pressure

Year: 2018

Authors: Thibaud JM., Rouquette J., Dziubek K., Gorelli FA., Santoro M., Garbarino G., Clement S., Cambon O., van der Lee A., Di Renzo F., Coasne B., Haines J.

Autors Affiliation: Univ Montpellier, ENSCM, CNRS, ICGM, F-34090 Montpellier, France; European Lab Non Linear Spect LENS, I-50019 Sesto Fiorentino, Italy; Adam Mickiewicz Univ, Fac Chem, Umultowska 89b, PL-61614 Poznan, Poland; CNR, INO, I-50019 Sesto Fiorentino, Italy; ESRF, F-38000 Grenoble, France; Univ Montpellier, CNRS, L2C, F-34090 Montpellier, France; Univ Montpellier, CNRS, IEM, F-34090 Montpellier, France; Univ Grenoble Alpes, CNRS, LIPhy, F-38058 Grenoble, France.

Abstract: The insertion of neon and argon in the 1-D pore system of the zeolite TON was studied at high pressure by Xray diffraction and by Monte Carlo (MC) molecular modeling. Rietveld refinements of the crystal structure of TON and the MC results indicate that 12 Ne atoms enter the unit cell of TON, completely filling the pores. This is much greater than the degree of filling observed for argon, which due to size considerations lies’ in a vertical plane in the pores. A phase transition from the Cmc2(1) to a Pbn2(1) structure occurs at 0.6 GPa with cell doubling. The compressibility and structural distortions, such as pore ellipticity, are considerably reduced as compared to the argon-filled or the empty-pore material. In addition, the crystalline form persists to pressures of the order of 20 GPa, and the Pbn21 phase is recovered after decompression. The results show the very strong and different effects of pore filling by noble gases on the structural stability and mechanical properties of this prototypical 1-D zeolite-type material.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY C

Volume: 122 (15)      Pages from: 8455  to: 8460

More Information: We are grateful for the support from PICS bilateral project CNR/CNRS (Italy/France), 2014-2016: Multifunctional zeolite/polymer nanocomposites. We acknowledge funding from the Agence Nationale de la Recherche program Investissements dŽavenir in the framework of the contract ANR-10-LABX-05-01 (LabEx CheMISyst) and the Italian Ministry of Education, Universities and Research, MIUR PRIN project ZAPPING, no. 2015HK93L7. We also thank the Deep Carbon Observatory (DCO) initiative under the project Physics and Chemistry of Carbon at Extreme Conditions and the Ente Cassa di Risparmio di Firenze under the project Firenze Hydrolab 2. K.D. acknowledges the Polish Ministry of Science and Higher Education for financial support through the “Mobilnosc Plus” program.
KeyWords: small-pore zeolite; induced amorphization; induced hydration; guest molecules; insertion
DOI: 10.1021/acs.jpcc.8b01827

Citations: 12
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