129Xe NMR study of xenon adsorbed on Y zeolites

Abstract

Density dependences of NMR signal shifts and widths for 129Xe adsorbed on NaX, NaY, HY, CaY, and CaA zeolites are observed. At zero density, shifts upfield relative to Xe gas are 58±4 ppm for NaX, NaY, and HY, and 83±2 ppm for CaA. Shift/Xe density gradients are 46±2 ppm/1021 atoms/g for NaX, NaY, and HY, 58±2 ppm/1021 atoms/g for CaA. These shifts are explained mainly in terms of collisions between Xe atoms and cage walls and other Xe atoms. They correspond to a very high apparent Xe density (several hundred amagats).

Structure and acidity of Mo/H-MCM-22 catalysts studied by NMR spectroscopy

“…4. In general, the observed chemical shift in the low xenon loading (Henry's law) regime can be expressed by the following equation [7][8][9][23][24][25][26][27]: Xe loading) to the chemical shift axis. On the other hand, the last term proportional to r is the characteristic of XeXe interactions.…”

“…Owing to its chemical inertness, high polarizability and wide range of chemical shift (>5000 ppm), 129 Xe NMR [7,8] spectroscopy of adsorbed xenon is sensitive to its local environments and hence has been widely used for porosity characterization. As a result, numerous applications in porous materials, such as zeolites and molecular sieves, can be found [9,10].…”

129Xe on Ir(111): NMR study of xenon on a metal single crystal surface

“…129 Xe is especially suited as an NMR probe because of the large shift range it experiences when physisorbed. Therefore, it has found many applications in the study of supported catalysts or porous media among others (6)(7)(8). Here, we present previously unreported NMR data of 129 Xe adsorbed on a single crystal metal surface, namely Ir(111).…”

Amplification of xenon NMR and MRI by remote detection

“…The combination of high SNR, extremely long T 1 relaxation time, broad chemical shift range, and chemical inertness make 129 Xe atoms both information carriers and model sensors of local environment (18,19). The favorable features of 129 Xe give access to void space MRI of the lung volume (20), chemical and structural properties of porous media (21,22), and protein binding events in solution (23).…”