title: Irreversible xenon insertion into a small-pore zeolite at moderate pressures and temperatures.
abstract: Pressure drastically alters the chemical and physical properties of materials and allows structural phase transitions and chemical reactions to occur that defy much of our understanding gained under ambient conditions. Particularly exciting is the high-pressure chemistry of xenon, which is known to react with hydrogen and ice at high pressures and form stable compounds. Here, we show that Ag16Al16Si24O8·16H2O (Ag-natrolite) irreversibly inserts xenon into its micropores at 1.7 GPa and 250 °C, while Ag(+) is reduced to metallic Ag and possibly oxidized to Ag(2+). In contrast to krypton, xenon is retained within the pores of this zeolite after pressure release and requires heat to desorb. This irreversible insertion and trapping of xenon in Ag-natrolite under moderate conditions sheds new light on chemical reactions that could account for the xenon deficiency relative to argon observed in terrestrial and Martian atmospheres.
authors.affiliation: Department of Earth System Sciences, Yonsei University, Seoul 120749, Korea.
authors.forename: Donghoon
authors.initials: D
authors.lastname: Seoung
authors.affiliation: Department of Earth System Sciences, Yonsei University, Seoul 120749, Korea.
authors.forename: Yongmoon
authors.initials: Y
authors.lastname: Lee
authors.affiliation: High-Pressure Physics Group, Physics and Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: Hyunchae
authors.initials: H
authors.lastname: Cynn
authors.affiliation: HPCAT, Geophysical Laboratory, Carnegie Institution of Washington, Argonne, Illinois 60439-4803, USA.
authors.forename: Changyong
authors.identifier: 0000000233635788
authors.initials: C
authors.lastname: Park
authors.affiliation: Department of Physics, Chung-Ang University, Seoul 156-756, Korea.
authors.forename: Kwang-Yong
authors.initials: KY
authors.lastname: Choi
authors.affiliation: NanoCenter &Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
authors.forename: Douglas A
authors.initials: DA
authors.lastname: Blom
authors.affiliation: High-Pressure Physics Group, Physics and Life Sciences, Lawrence Livermore National Laboratory, Livermore, California 94550, USA.
authors.forename: William J
authors.initials: WJ
authors.lastname: Evans
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Menlo Park, California 94025, USA.
authors.forename: Chi-Chang
authors.initials: CC
authors.lastname: Kao
authors.affiliation: NanoCenter &Department of Chemistry and Biochemistry, University of South Carolina, Columbia, South Carolina 29208, USA.
authors.forename: Thomas
authors.initials: T
authors.lastname: Vogt
authors.affiliation: Department of Earth System Sciences, Yonsei University, Seoul 120749, Korea.
authors.forename: Yongjae
authors.initials: Y
authors.lastname: Lee