scholarly journals Structural interpretation of the energetic performances of a pure silica LTA-type zeolite

2020 ◽  
Vol 22 (9) ◽  
pp. 5178-5187 ◽  
Author(s):  
Giorgia Confalonieri ◽  
Andrey Ryzhikov ◽  
Rossella Arletti ◽  
Simona Quartieri ◽  
Giovanna Vezzalini ◽  
...  
Keyword(s):  
Nmr Spectroscopy ◽  
Thermogravimetric Analysis ◽  
Aqueous Solutions ◽  
Extrusion Process ◽  
Structural Interpretation ◽  
Pure Silica ◽  
Lta Zeolite ◽  
Type Zeolite ◽  
Zeolite P

The intrusion–extrusion process of various electrolyte aqueous solutions in a hydrophobic pure-silica LTA zeolite was investigated for energetic purposes by means of in situ HP XRPD, porosimeter tests, thermogravimetric analysis and NMR spectroscopy.

Drastic change of the intrusion–extrusion behavior of electrolyte solutions in pure silica *BEA-type zeolite

2014 ◽  
Vol 16 (33) ◽  
pp. 17893-17899 ◽  
Author(s):  
A. Ryzhikov ◽  
I. Khay ◽  
H. Nouali ◽  
T. J. Daou ◽  
J. Patarin
Keyword(s):  
High Pressure ◽  
Electrolyte Concentration ◽  
Electrolyte Solutions ◽  
Drastic Change ◽  
Pure Silica ◽  
Type Zeolite ◽  
Zeolite P

A behavior of high pressure intrusion–extrusion of electrolyte solutions in pure silica *BEA-type zeolite depends drastically on electrolyte concentration.

The Chemistry of Detrital Aluminum in Zeolites Studied by Multinuclear NMR Spectroscopy and Other Techniques

1987 ◽  
Vol 111 ◽  
Author(s):  
Richard H. Jarman
Keyword(s):  
Nmr Spectroscopy ◽  
Thermogravimetric Analysis ◽  
High Resolution ◽  
Nmr Spectra ◽  
Compositional Data ◽  
Analysis Data ◽  
State Of Charge ◽  
Zeolite Framework ◽  
Multinuclear Nmr Spectroscopy ◽  
Type Zeolite

AbstractHigh resolution 27Al NMR spectroscopy has been used to study the dealumination of the A-type zeolite ZK4. The aluminum removed from the lattice during calcination undergoes reversible changes in coordination when treated in acidic and basic media. 2 5 Si NMR spectroscopy reveals that the changes are confined to the detrital aluminum species and do not affect the zeolite framework. Thermogravimetric analysis data combined with compositional data available from 29Si NMR spectra have been used to probe the state of charge of the detrital aluminum species and the nature of defects present in the lattice.

scholarly journals Intrusion–Extrusion of Electrolyte Aqueous Solutions in Pure Silica Chabazite by in Situ High Pressure Synchrotron X-ray Powder Diffraction

2018 ◽  
Vol 122 (49) ◽  
pp. 28001-28012 ◽  
Author(s):  
Giorgia Confalonieri ◽  
Andrey Ryzhikov ◽  
Rossella Arletti ◽  
Habiba Nouali ◽  
Simona Quartieri ◽  
...  
Keyword(s):  
High Pressure ◽  
Aqueous Solutions ◽  
Powder Diffraction ◽  
X Ray ◽  
Pure Silica

Optical properties of the hydrated charged silver tetramer and silver hexamer encapsulated inside the sodalite cavity of an LTA-type zeolite

2016 ◽  
Vol 18 (27) ◽  
pp. 18128-18136 ◽  
Author(s):  
Ngo Tuan Cuong ◽  
Hue Minh Thi Nguyen ◽  
My Phuong Pham-Ho ◽  
Minh Tho Nguyen
Keyword(s):  
Optical Properties ◽  
Lta Zeolite ◽  
Td Dft ◽  
Type Zeolite ◽  
Zeolite P

The UV-VIS spectra of the hydrated charged silver tetramer and hexamer embedded inside the sodalite cage of LTA zeolite have been calculated using TD-DFT and CASSCF/CASPT2 methods.

Unexpected Keto-enol Tautomerism in the Cyclopyridinophane Class Direct and indirect proofs

2008 ◽  
Vol 59 (10) ◽  
Author(s):  
Paul Ionut Dron ◽  
Neculai Doru Miron ◽  
Gheorghe Surpateanu
Keyword(s):  
Nmr Spectroscopy ◽  
1H Nmr ◽  
Stable Conformer ◽  
Ph Measurements ◽  
Theoretical Methods ◽  
Nmr Data ◽  
Tautomeric Forms ◽  
New Compounds

The paper presents the synthesis of cyclo (bis-paraquat p-phenylene p-phenylene-carbonyl) tetrakis (hexafluorophosphate), named �CETOBOX�, and the closely related structural determinations. This compound exists in three tautomeric forms. These forms were evidentiated by NMR-data (1H-NMR, TOCSY, COSY, NOESY), UV-Vis spectra coupled with pH measurements and by synthesis. As the �CETOBOX� gives �in situ� only the corresponding monoylide, the synthesis of a new fluorescent indolizine cyclophane has been performed by a 3+2 cycloaddition. All structures of the new compounds presented herein have been established by NMR spectroscopy. Also, theoretical methods (MM3, AM1, AM1-COSMO and B88LYPDFT) have been used to determine the most stable conformer structures.

Catalytic activity of rhodium(I) complexes containing (ω-trimethylsilylalkyl)diphenylphosphines

1980 ◽  
Vol 45 (8) ◽  
pp. 2219-2223 ◽  
Author(s):  
Marie Jakoubková ◽  
Martin Čapka
Keyword(s):  
Catalytic Activity ◽  
Nmr Spectroscopy ◽  
Ir Spectroscopy ◽  
Electron Density ◽  
Phosphorus Atom ◽  
Proton Acceptor ◽  
Trimethylsilyl Group ◽  
Kinetics Of

Kinetics of homogenous hydrogenation of 1-heptene catalysed by rhodium(I) complexes prepared in situ from μ,μ'-dichloro-bis(cyclooctenerhodium) and phosphines of the type RP(C6H5)2 (R = -CH3, -(CH2)nSi(CH3)3; n = 1-4) have been studied. The substitution of the ligands by the trimethylsilyl group was found to increase significantly the catalytic activity of the complexes. The results are discussed in relation to the electron density on the phosphorus atom determined by 31P NMR spectroscopy and to its proton acceptor ability determined by IR spectroscopy.

scholarly journals Mesoscopic simulations of the in situ NMR spectra of porous carbon based supercapacitors: Electronic structure and adsorbent reorganisation effects

2021 ◽  
Author(s):  
Anagha Sasikumar ◽  
Anouar Belhboub ◽  
Camille Bacon ◽  
Alexander C. Forse ◽  
John Griffin ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Nmr Spectroscopy ◽  
Molecular Species ◽  
Porous Carbon ◽  
Nmr Spectra ◽  
Charge Storage ◽  
In Situ Nmr Spectroscopy ◽  
In Situ Nmr ◽  
Carbon Based

In situ NMR spectroscopy is a powerful technique to investigate charge storage mechanisms in carbon-based supercapacitors thanks to its ability to distinguish ionic and molecular species adsorbed in the porous...

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