Revealing the specific spatial confinement in 8‐membered ring cage‐type molecular sieves via solid‐state NMR and theoretical calculation

ChemCatChem ◽  
2020 ◽  
Author(s):  
Caiyi Lou ◽  
Wenna Zhang ◽  
Chao Ma ◽  
Benhan Fan ◽  
Shutao Xu ◽  
...  
Keyword(s):  
Solid State ◽  
Theoretical Calculation ◽  
Molecular Sieves ◽  
Solid State Nmr ◽  
Membered Ring ◽  
Spatial Confinement

scholarly journals Solid-state nuclear magnetic resonance characterization of the second generation of the UEC family of molecular sieves

2019 ◽  
Author(s):  
Heitor Secco Seleghini ◽  
Heloise de Oliveira Pastore ◽  
Fábio Aurélio Bonk
Keyword(s):  
Nuclear Magnetic Resonance ◽  
Solid State ◽  
Magnetic Resonance ◽  
Molecular Sieves ◽  
Solid State Nmr ◽  
Second Generation ◽  
3D Structures ◽  
Nuclear Magnetic

This work reports the characterization using solid-state NMR of the second generation of the UEC family of molecular sieves, such generation is composed by two tridimensional silicoaluminophosphates synthesized from a layered aluminophosphate (AlPO-CJ70). The 3D structures are analogous to SAPO-5 (UEC-4) and SAPO-15 (UEC-5), both were characterized using multinuclear solid-state NMR, 27Al-MQ-MAS and 29Si{27Al} TRAPDOR.

Boron Environments in B-Doped and (B, N)-Codoped TiO2 Photocatalysts: A Combined Solid-State NMR and Theoretical Calculation Study

2011 ◽  
Vol 115 (6) ◽  
pp. 2709-2719 ◽  
Author(s):  
Ningdong Feng ◽  
Anmin Zheng ◽  
Qiang Wang ◽  
Pingping Ren ◽  
Xiuzhi Gao ◽  
...  
Keyword(s):  
Solid State ◽  
Theoretical Calculation ◽  
Solid State Nmr ◽  
Tio2 Photocatalysts ◽  
Codoped Tio2

Combined Solid-State NMR and Theoretical Calculation Studies of Brønsted Acid Properties in Anhydrous 12-Molybdophosphoric Acid

2010 ◽  
Vol 114 (36) ◽  
pp. 15464-15472 ◽  
Author(s):  
Ningdong Feng ◽  
Anmin Zheng ◽  
Shing-Jong Huang ◽  
Hailu Zhang ◽  
Ningya Yu ◽  
...  
Keyword(s):  
Solid State ◽  
Theoretical Calculation ◽  
Solid State Nmr ◽  
Bronsted Acid ◽  
Molybdophosphoric Acid ◽  
Brønsted Acid ◽  
Acid Properties ◽  
Brönsted Acid

Synthesis, Characterization and Modification of Mcm-41 Molecular Sieves

1994 ◽  
Vol 371 ◽  
Author(s):  
A. Sayari ◽  
V.R. Karra ◽  
J.S. Reddy ◽  
I.L. Moudrakovski
Keyword(s):  
Catalytic Activity ◽  
Solid State ◽  
Molecular Sieves ◽  
Solid State Nmr ◽  
Hexagonal Phase ◽  
Mesoporous Molecular Sieves ◽  
Ammonium Bromide ◽  
Final Phase ◽  
Dimethyl Ammonium ◽  
Mcm 41

AbstractA series of crystalline mesoporous molecular sieves were prepared using alkyl hexadecyl dimethyl ammonium bromide salts (C16H33)(CnH2n + 1)(CH3)2NBr, in which the number of carbon atoms (n) in one alkyl group was varied from 1 to 12. The influence of (n) value on the nature of the final phase obtained and on its pore size was investigated. A hexagonal phase was obtained for n = 1, 3, 5 and 7, while a lamellar phase was obtained for all other templates. Vanadium and titanium modified MCM-41 molecular sieves were also prepared in the presence of C12H25(CH3)3N+ and C16H33(CH3)3N+ ions, respectively. These materials were characterized by XRD, nitrogen physisorption, FTIR, solid state NMR, XPS, UV-Vis and catalytic testing in the oxidation of 1-naphthol, 2,6-di-tert-butylphenol, norbornylene, n-hexane and propylamine. Ti-MCM-41 exhibited considerable catalytic activity only in the oxidation of aromatics, olefins and alcohols. V-MCM-41 was found to be a good catalyst in the oxidation of aromatics and alkanes.

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