Insertion of Argon, Nitrogen, and Oxygen in the Large-Pore Aluminophosphate AlPO4-54 at High Pressure

Year: 2025

Authors: Alabarse F.G., Fabbiani M., Baptiste B., Santoro M., Haines J.

Autors Affiliation: Elettra Sincrotrone Trieste, I-34149 Trieste, Italy; Univ Montpellier, Inst Charles Gerhardt Montpellier, CNRS, ENSCM, F-34293 Montpellier, France; Univ Caen Normandie, Lab Catalyse & Spectrochim, ENSICAEN, CNRS, F-14000 Caen, France; Sorbonne Univ, UMR 7590 CNRS, Phys Mate & Cosmochim, IMPMC,Inst Mineral,IRD MNHN, 4 Pl Jussieu, F-75252 Paris 5, France; INO CNR, Ist Nazl Ott, I-50019 Sesto Fiorentino, Italy; LENS, European Lab Non Linear Spect, I-50019 Sesto Fiorentino, Italy.

Abstract: Insertion of argon, nitrogen, and oxygen guests in the large 12 & Aring; pores of the aluminophosphate AlPO4-54 under high pressure was studied by synchrotron, X-ray powder diffraction. Structure refinements using the Rietveld method indicate that the number of guests per unit cell saturates at 24-28, which is greater than the values observed in adsorption experiments at low temperature due to the higher fluid densities at high pressure. Guest insertion suppresses transformations to crystalline forms at high pressure, such as AlPO4-8, and the beginning of amorphization is shifted to a much higher pressure as compared to the empty pore material.

Journal/Review: JOURNAL OF PHYSICAL CHEMISTRY C

Volume: 129 (8)      Pages from: 4313  to: 4320

More Information: The synchrotron X-ray diffraction experiments were performed at the Xpress beamline from Elettra Sincrotrone Trieste (proposal number: 20195123). The research leading to this result has been supported by the project CALIPSOplus under Grant Agreement 730872 from the EU Framework Programme for Research and Innovation HORIZON 2020. We acknowledge R. Borghes and V. Chenda for having improved the Xpress beamline software tools and for I. Cudin for the design and machining of the cryogenic loader.
KeyWords: X-ray-diffraction; Crystal-fluid Interaction; Molecular-sieve; Induced Amorphization; Zeolite; H2o; Dense; Polymerization; Adsorption; Behavior
DOI: 10.1021/acs.jpcc.5c00154