Nuclear magnetic resonance study of xenon adsorbed on metal-NaY zeolites. A new method for the determination of the mean number of atoms in small metallic particles supported on Y zeolites

Ménorval, Louis-Charles de; Fraissard, J.; Itō, Tarō

doi:10.1039/f19827800403

Cited by 89 publications

(31 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[2][3][4][5] Rare-gas atoms have long been used in different experimental techniques to probe solid surfaces. For example, atom scattering using He and Ne atoms, 6 nuclear magnetic resonance using 129 Xe atoms, 7,8 photoemission of adsorbed Xe atoms, 9 and high energy Ar ions have been used for many years to clean solid surfaces and to measure local electrostatic fields. Rare-gas atoms have also been used to create local strain at solid surfaces by formation of subsurface Ar, Kr, and Xe bubbles.…”

Section: Introductionmentioning

confidence: 99%

Trends in adsorption of noble gases He, Ne, Ar, Kr, and Xe onPd(111)(3×3)R30°: All-electron

Silva

Stampfl

2008

Phys. Rev. B

View full text Add to dashboard Cite

It was recently found from ab initio investigations ͓J. L. F. Da Silva et al., Phys. Rev. Lett. 90, 066104 ͑2003͔͒ that polarization effects and the site dependence of the Pauli repulsion largely dictate the nature of the interaction and the site preference of Xe adatoms on close-packed metal surfaces. It is unclear if the same interaction mechanism occurs for all rare-gas atoms adsorbed on such surfaces. To address this question, we perform all-electron density-functional theory calculations with the local-density approximation ͑LDA͒ and generalized gradient approximations ͑GGA͒ for ͓He, Ne, Ar, Kr, and Xe͔ / Pd͑111͒ in the ͑ ͱ 3 ϫ ͱ 3͒R30°s tructure. Our results confirm that polarization effects of the rare-gas adatoms and Pd atoms in the topmost surface layer, together with the site-dependent Pauli repulsion, largely determine the interaction between rare-gas atoms and the Pd͑111͒ surface. Similar to the earlier ab initio study, the on-top site preference is obtained by the LDA for all rare-gas adatoms, while the GGA functionals yield the on-top site preference for Xe, Kr, and He adatoms, but the fcc site for Ne and Ar.

show abstract

Section: Introductionmentioning

confidence: 99%

Trends in adsorption of noble gases He, Ne, Ar, Kr, and Xe onPd(111)(3×3)R30°: All-electron

Silva

Stampfl

2008

Phys. Rev. B

View full text Add to dashboard Cite

show abstract

“…metal particles [58]), highly charged cations [59], may present strong adsorption sites on their surface. These latter can specifically interact with Xe.…”

Section: Nmr Chemical Shiftmentioning

confidence: 99%

129Xenon NMR: Review of recent insights into porous materials

Weiland

Springuel‐Huet

Nossov

et al. 2016

Microporous and Mesoporous Materials

View full text Add to dashboard Cite

“…Fraissard finds that CO adsorbs with the stoichiometry of one molecule per particle, while hydrogen and oxygen adsorb as 2 atoms per platinum particle [105].…”

Section: Metal Zeolitesmentioning

confidence: 99%

“…Above this temperature, the platinum particles migrate away from the supercages into the small, inaccessible sodalite cages. Xenon can detect the distribution of species such as H 2 , O 2 or CO adsorbed onto the platinum particles in a zeolite crystallite [105]. A~ room temperature, the gas molecules adsorb onto the first platinum particle they encounter, as…”

Section: Metal Zeolitesmentioning

confidence: 99%

See 1 more Smart Citation

Optical pumping and xenon NMR

Raftery¹

1991

View full text Add to dashboard Cite

Nuclear Magnetic Resonance (NMR) spectroscopy of xenon has become an important tool for jnvestigating a wide variety of materials, especially those with high surface area. The sensitivity of its chemical shift to environment, and its chemical inertness . and adsorption properties make xenon a particularly useful NMR probe. This work discusses the application of optical pumping to enhance the sensitivity of xenon NMR " experiments, thereby allowing them to be Used in the study of systems with lower surface area.A novel method of optically-pumping 129Xe in low magnetic field below an NMR spectrometer and subsequent transfer of the gas to high magnetic field is described.NMR studies of the highly polarized gas adsorbed onto powdered samples with low to moderate surface areas are now possible. For instance, NMR studies of optically~ pumped xenon adsorbed onto polyacrylic acid show that xenon has alarge interaction with the surface. By modeling the low temperature data in terms of a sticking probability and the gas phase xenon-xenon interaction, the diffusion coefficient for xenon at the surface of the polymer is determined. The sensitivity enhancement afforded by optical pumping also allows the NMR observation of xenon thin films frozen onto the inner surfaces of different sample cells. The geometry of the thin films results in interesting line shapes that are due to the bulk magnetic susceptibility of xenon.Experiments are also descriped that combine optical pumping with optical detection for high sensitivity in low magnetic field to observe the quadrupolar evolution of 131 Xe spins at the surface of the pumping cell~. In cells with macroscopic asymmetry, a residual quadrupolar interaction causes a splitting in the 131XeNMR frequencies in bare Pyrex glass cells and cells with added hydrogen.Conventional xenon NMR experiments conducted on coadsorbed organic molecules _ in Na-Y zeolites show that the xenon chemical shift is sensitive to the identity and concentration of these guests. Clusters of xenon trapped in Na-A zeolite have interesting statistical distributions due to the finite atomic size of the xenon. The statistics can be described in the low to moderate loading regime by binary and hypergeometric distribution functions.Finally, a comprehensive review of the xenon NMR literature, including previous optical pumping studies, is provided.; ; "

show abstract

Nuclear magnetic resonance study of xenon adsorbed on metal-NaY zeolites. A new method for the determination of the mean number of atoms in small metallic particles supported on Y zeolites

Cited by 89 publications

References 0 publications

Trends in adsorption of noble gases He, Ne, Ar, Kr, and Xe onPd(111)(3×3)R30°: All-electron

Trends in adsorption of noble gases He, Ne, Ar, Kr, and Xe onPd(111)(3×3)R30°: All-electron

129Xenon NMR: Review of recent insights into porous materials

Optical pumping and xenon NMR

Contact Info

Product

Resources

About