Characterization of the acidity of Mu-14 by solid-state NMR and NH3-STD
Literature Information
Angélique Simon, Jean-Louis Paillaud, Valentin Valtchev, Henri Kessler
The distribution and strength of the Brönsted acid sites in three Mu-14 (ITE structure type) samples with different Si/Al ratios (17, 28 and 35) were studied by 1H MAS (magic angle spinning), 1H-{27Al} TRAPDOR (transfer of population in double resonance), 1H-29Si CP-MAS (cross-polarisation magic angle spinning)/ HETCOR (two-dimensional heteronuclear correlation) NMR, and NH3-STD (stepwise thermal desorption). The 1H MAS NMR spectra exhibit two different types of bridging OH groups associated with proton chemical shifts of ca. 4.2 and 5.3 ppm. From the 1H-29Si HETCOR experiments a single Brönsted [Si-(OSi)3(OAl)1] Q3 site resonating at δ(29Si) = − 108 ppm, can be distinguished from two different [Si-(OSi)3(OH)1] Q3 sites, at δ(29Si) = − 101 and − 104 ppm, and one of the Q4 sites resonating at δ(29Si) = − 108.5 ppm. Aluminum is not randomly distributed in the structure of Mu-14, but rather sits at preferred places isolated from silanols. The acid strength of the Brönsted acid sites, determined by NH3-STD, is slightly higher in Mu-14 than in a HZSM-5 with a similar Si/Al ratio.
Related Literature
Surface electrochemistry of CO as a probe molecule on carbon-supported Se-surface modified Ru nanoparticlesviainfrared reflection absorption spectroscopy
Elena R. Savinova, Francoise Hahn, Nicolas Alonso-Vante
DOI: 10.1039/B709436A
Selected ion flow tube cation–molecule reaction studies and threshold photoelectron photoion coincidence spectroscopy of cyclic-C5F8
Michael A. Parkes, Sahangir Ali, Richard P. Tuckett, Victor A. Mikhailov, Chris A. Mayhew
DOI: 10.1039/B704862A
On the photochemistry of IONO2 : absorption cross section (240–370 nm) and photolysis product yields at 248 nm
D. M. Joseph, S. H. Ashworth, J. M. C. Plane
DOI: 10.1039/B709465E
Second-harmonic generation for studying structural motion of biological molecules in real time and space
DOI: 10.1039/B710505C
Binding free energy prediction in strongly hydrophobic biomolecular systems
Landry Charlier, Claude Nespoulous, Sébastien Fiorucci, Serge Antonczak, Jérome Golebiowski
DOI: 10.1039/B710186D
Low-volatility poly-oxygenates in the OH-initiated atmospheric oxidation of α-pinene: impact of non-traditional peroxyl radical chemistry
L. Vereecken, J.-F. Müller, J. Peeters
DOI: 10.1039/B708023A
You might also like
What is Ethyl 3-cyclohexylpropanoate (CAS: 10094-36-7)?
Ethyl 3-cyclohexylpropanoate is a clear, colorless to light yellow liquid with a...
How should waste containing 2-(Hydroxymethyl)-5-(methoxycarbonyl)-6-methyl-4-(2-nitrophenyl)nicotinic acid (CAS: 34783-31-8) be handled?
Waste containing 2-(Hydroxymethyl)-5-(methoxycarbonyl)-6-methyl-4-(2-nitrophenyl...
How should waste containing 2,4,6-Tris(pentafluoroethyl)-1,3,5-triazine (CAS: 858-46-8) be handled?
Waste containing 2,4,6-Tris(pentafluoroethyl)-1,3,5-triazine (CAS: 858-46-8) sho...
What precautions should be taken when handling Chloroac-nle-oh (CAS: 56787-36-1)?
When handling Chloroac-nle-oh (CAS: 56787-36-1), it is essential to wear appropr...
What industries use Ethyl 6-phenylimidazo[2,1-b][1,3]thiazole-3-carboxylate (CAS: 752244-05-6)?
Ethyl 6-phenylimidazo[2,1-b][1,3]thiazole-3-carboxylate is primarily used in the...
Are there alternatives to alpha-(2-Bromophenyl)benzylamine (CAS: 55095-15-3) in synthesis?
Alternatives to alpha-(2-Bromophenyl)benzylamine (CAS: 55095-15-3) in synthesis ...
How should waste containing 2-Chloro-5-methoxypyridine (CAS: 139585-48-1) be handled?
Waste containing 2-Chloro-5-methoxypyridine (CAS: 139585-48-1) should be managed...
What industries use 1-(4-Methoxyphenyl)-2,5-dimethyl-1H-pyrrole (CAS: 5044-27-9)?
1-(4-Methoxyphenyl)-2,5-dimethyl-1H-pyrrole (CAS: 5044-27-9) is used in various ...
Are there alternatives to 3-Bromo-5-(N-Boc)aminomethylisoxazole (CAS: 903131-45-3) in synthesis?
There are alternative reagents and compounds that can be used in the synthesis o...
What is Tungsten(IV) oxide (CAS: 12036-22-5)?
Tungsten(IV) oxide, also known as tungsten dioxide, is a chemical compound with ...
Source Journal
Physical Chemistry Chemical Physics

Physical Chemistry Chemical Physics (PCCP) is an international journal co-owned by 19 physical chemistry and physics societies from around the world. This journal publishes original, cutting-edge research in physical chemistry, chemical physics and biophysical chemistry. To be suitable for publication in PCCP, articles must include significant innovation and/or insight into physical chemistry; this is the most important criterion that reviewers and Editors will judge against when evaluating submissions. The journal has a broad scope and welcomes contributions spanning experiment, theory, computation and data science. Topical coverage includes spectroscopy, dynamics, kinetics, statistical mechanics, thermodynamics, electrochemistry, catalysis, surface science, quantum mechanics, quantum computing and machine learning. Interdisciplinary research areas such as polymers and soft matter, materials, nanoscience, energy, surfaces/interfaces, and biophysical chemistry are welcomed if they demonstrate significant innovation and/or insight into physical chemistry. Joined experimental/theoretical studies are particularly appreciated when complementary and based on up-to-date approaches.











![1-(Hexopyranosyloxy)-4a,5-dihydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-7-yl 3-phenylacrylate structure 1-(Hexopyranosyloxy)-4a,5-dihydroxy-7-methyl-1,4a,5,6,7,7a-hexahydrocyclopenta[c]pyran-7-yl 3-phenylacrylate structure](https://static.chemtradehub.com/structs/192/19210-12-9-ecae.webp)
![2-Bromodibenzo[b,d]furan structure 2-Bromodibenzo[b,d]furan structure](https://static.chemtradehub.com/structs/86-/86-76-0-1814.webp)

