Primary Adsorption Sites of Light Alkanes in Multivariate UiO-66 at Room Temperature as Revealed by Solid-State NMR

2020 ◽  
Vol 124 (6) ◽  
pp. 3738-3746 ◽  
Author(s):  
Yuqing Xiao ◽  
Yueying Chu ◽  
Shenhui Li ◽  
Yongchao Su ◽  
Jing Tang ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Light Alkanes ◽  
Adsorption Sites

Fluorine Patterning in Room-Temperature Fluorinated Graphite Determined by Solid-State NMR and DFT

2013 ◽  
Vol 117 (15) ◽  
pp. 7940-7948 ◽  
Author(s):  
Anastasia Vyalikh ◽  
Lyubov G. Bulusheva ◽  
Galina N. Chekhova ◽  
Dmitry V. Pinakov ◽  
Alexander V. Okotrub ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Fluorinated Graphite

Room temperature activation of methane over Zn modified H-ZSM-5 zeolites: Insight from solid-state NMR and theoretical calculations

2012 ◽  
Vol 3 (10) ◽  
pp. 2932 ◽  
Author(s):  
Jun Xu ◽  
Anmin Zheng ◽  
Xiumei Wang ◽  
Guodong Qi ◽  
Jihu Su ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Theoretical Calculations ◽  
Temperature Activation

scholarly journals Effect of aluminum and sodium on the sorption of water and methanol in microporous MFI-type zeolites and mesoporous SBA-15 materials

Adsorption ◽  
2020 ◽  
Author(s):  
Zheng Li ◽  
Carolin Rieg ◽  
Ann-Katrin Beurer ◽  
Michael Benz ◽  
Johannes Bender ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Acid Sites ◽  
Mas Nmr ◽  
Nmr Studies ◽  
Oh Groups ◽  
Adsorption Sites ◽  
Low Field ◽  
Strong Adsorption ◽  
Nmr Signals

Abstract The interaction and nature of surface sites for water and methanol sorption on MFI-type zeolites and mesoporous SBA-15 were investigated by solid-state NMR spectroscopy and correlated with the desorption enthalpies determined via TGA/DSC. For siliceous Silicalite-1, 29Si CPMAS NMR studies support stronger methanol than water interactions with SiOH groups of Q3-type. On siliceous SBA-15, SiOH groups of Q2-type are accompanied by an enhanced hydrophilicity. In aluminum-containing Na-ZSM-5, Na+ cations are strong adsorption sites for water and methanol as evidenced by 23Na MAS NMR in agreement with high desorption enthalpies of ΔH = 66–74 kJ/mol. Solid-state NMR of aluminum-containing Na-[Al]SBA-15, in contrast, has shown negligible water and methanol interactions with sodium and aluminum. Desorption enthalpies of ΔH = 44–60 kJ/mol hint at adsorption sites consisting of SiOH groups influenced by distant framework aluminum. On H-ZSM-5, Brønsted acidic OH groups are strong adsorption sites as indicated by partial protonation of water and methanol causing low-field shifts of their 1H MAS NMR signals and enhanced desorption enthalpies. Due to the small number of Brønsted acid sites in aluminum-containing H-[Al]SBA-15, water and methanol adsorption on this material is suggested to mainly occur at SiOH groups with distant framework aluminum species, as in the case of Na-[Al]SBA-15.

In situ solid-state NMR studies of Ca3SiO5: hydration at room temperature and at elevated temperatures using 29Si enrichment

1994 ◽  
Vol 29 (15) ◽  
pp. 3926-3940 ◽  
Author(s):  
A. R. Brough ◽  
C. M. Dobson ◽  
I. G. Richardson ◽  
G. W. Groves
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Elevated Temperatures ◽  
Nmr Studies

Room temperature stable zinc carbonyl complex formed in zeolite ZSM-5 and its hydrogenation reactivity: a solid-state NMR study

2015 ◽  
Vol 51 (44) ◽  
pp. 9177-9180 ◽  
Author(s):  
Guodong Qi ◽  
Qiang Wang ◽  
Yueying Chu ◽  
Jun Xu ◽  
Anmin Zheng ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Carbonyl Complex ◽  
Nmr Study

The structure and reactivity of a room temperature stable zinc carbonyl complex in Zn-modified H-ZSM-5 zeolite were revealed.

Room temperature CO oxidation catalysed by supported Pt nanoparticles revealed by solid-state NMR and DNP spectroscopy

2019 ◽  
Vol 9 (14) ◽  
pp. 3743-3752 ◽  
Author(s):  
Vytautas Klimavicius ◽  
Sarah Neumann ◽  
Sebastian Kunz ◽  
Torsten Gutmann ◽  
Gerd Buntkowsky
Keyword(s):  
Solid State ◽  
Co Oxidation ◽  
Dynamic Nuclear Polarization ◽  
Platinum Nanoparticles ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Nuclear Polarization ◽  
Pt Nanoparticles ◽  
Support Materials

A series of 1 and 2 nm sized platinum nanoparticles deposited on different support materials are investigated by solid-state NMR combined with dynamic nuclear polarization (DNP).

scholarly journals Facile, Room-Temperature 17O Enrichment of Zeolite Frameworks Revealed by Solid-State NMR Spectroscopy

2019 ◽  
Vol 142 (2) ◽  
pp. 900-906 ◽  
Author(s):  
Suzi M. Pugh ◽  
Paul A. Wright ◽  
David J. Law ◽  
Nicholas Thompson ◽  
Sharon E. Ashbrook
Keyword(s):  
Solid State ◽  
Nmr Spectroscopy ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Solid State Nmr Spectroscopy

scholarly journals Variable-Temperature Multinuclear Solid-State NMR Study of Oxide Ion Dynamics in Fluorite-Type Bismuth Vanadate and Phosphate Solid Electrolytes

2018 ◽  
Author(s):  
Matthew Dunstan ◽  
David M. Halat ◽  
Matthew Tate ◽  
Ivana Radosavljevic Evans ◽  
Clare Grey
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Nmr Spectra ◽  
Room Temperature ◽  
Variable Temperature ◽  
Spin Lattice Relaxation ◽  
Ion Dynamics ◽  
Ionic Motion ◽  
Vt Nmr ◽  
Oxide Ion

<p>In this study, we employ a multinuclear, variable-temperature NMR spectroscopy approach to characterise and measure oxide ionic motion in the V- and P-substituted bismuth oxide materials Bi0.913V0.087O1.587, Bi0.852V0.148O1.648 and Bi0.852P0.148O1.648, previously shown to have excellent ionic conduction properties. Two main <sup>17</sup>O NMR resonances are distinguished for each material, corresponding to O in the Bi–O and V–O/P–O sublattices. Using variable-temperature (VT) measurements ranging from room temperature to 923 K, the ionic motion experienced by these different sites has then been characterised, with coalescence of the two environments in the V-substituted materials clearly indicating a conduction mechanism facilitated by exchange between the two sublattices. The lack of this coalescence in the P-substituted material indicates a different mechanism, confirmed by <sup>17</sup>O T1 (spin-lattice relaxation) NMR experiments to be driven purely by vacancy motion in the Bi–O sublattice. <sup>51</sup>V and <sup>31</sup>P VT-NMR experiments show high rates of tetrahedral rotation even at room temperature, increasing with heating. An additional VO4 environment appears in <sup>17</sup>O and <sup>51</sup>V NMR spectra of the more highly V-substituted Bi0.852V0.148O1.648, which we ascribe to differently distorted VO4 tetrahedral units that disrupt the overall ionic motion, consistent both with linewidth analysis of the 17O VT-NMR spectra and experimental results of Kuang <i>et al.</i> showing a lower oxide ionic conductivity in this material compared to Bi0.913V0.087O1.587 (<i>Chem. Mater. </i>2012, 24, 2162). This study shows solid-state NMR is particularly well suited to understanding connections between local structural features and ionic mobility, and can quantify the evolution of oxide-ion dynamics with increasing temperature.</p>

scholarly journals Anisotropic nuclear spin interactions in H 2 O@C 60 determined by solid-state NMR

2013 ◽  
Vol 371 (1998) ◽  
pp. 20120102 ◽  
Author(s):  
M. Concistrè ◽  
S. Mamone ◽  
M. Denning ◽  
G. Pileio ◽  
X. Lei ◽  
...  
Keyword(s):  
Solid State ◽  
Nuclear Spin ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Chemical Shift Anisotropy ◽  
Water Molecules ◽  
Dipole Interactions ◽  
Nmr Study ◽  
Spin Interactions ◽  
Principal Axes

We report a solid-state NMR study of the anisotropic nuclear spin interactions in H 2 O@C 60 at room temperature. We find evidence of significant dipole–dipole interactions between the water protons, and also a proton chemical shift anisotropy (CSA) interaction. The principal axes of these interaction tensors are found to be perpendicular. The magnitude of the CSA is too large to be explained by a model in which the water molecules are partially aligned with respect to an external axis. The evidence indicates that the observed CSA is caused by a distortion of the geometry or electronic structure of the fullerene cages, in response to the presence of the endohedral water.

Solid-state NMR Studies of Host–Guest Interaction between UiO-67 and Light Alkane at Room Temperature

2017 ◽  
Vol 121 (26) ◽  
pp. 14261-14268 ◽  
Author(s):  
Jing Li ◽  
Shenhui Li ◽  
Anmin Zheng ◽  
Xiaolong Liu ◽  
Ningya Yu ◽  
...  
Keyword(s):  
Solid State ◽  
Solid State Nmr ◽  
Room Temperature ◽  
Nmr Studies ◽  
Light Alkane
Sign in / Sign up

Export Citation Format

Share Document