Structural Changes above the Glass Transition and Crystallization in Aluminophosphate Glasses:  An in Situ High-Temperature MAS NMR Study

2007 ◽  
Vol 111 (26) ◽  
pp. 7529-7534 ◽  
Author(s):  
Leo van Wüllen ◽  
Sebastian Wegner ◽  
Gregory Tricot
Keyword(s):  
Glass Transition ◽  
High Temperature ◽  
Structural Changes ◽  
Mas Nmr ◽  
Nmr Study ◽  
Aluminophosphate Glasses

In situ high temperature MAS NMR study of the mechanisms of catalysis. Ethane aromatization on Zn-modified zeolite BEA

2009 ◽  
Vol 35 (2) ◽  
pp. 113-119 ◽  
Author(s):  
Sergei S. Arzumanov ◽  
Anton A. Gabrienko ◽  
Dieter Freude ◽  
Alexander G. Stepanov
Keyword(s):  
High Temperature ◽  
Mas Nmr ◽  
Modified Zeolite ◽  
Nmr Study ◽  
Ethane Aromatization

In Situ High Temperature High Pressure MAS NMR Study on the Crystallization of AlPO4-5

2016 ◽  
Vol 120 (3) ◽  
pp. 1701-1708 ◽  
Author(s):  
Zhenchao Zhao ◽  
Suochang Xu ◽  
Mary Y. Hu ◽  
Xinhe Bao ◽  
Jian Zhi Hu
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Mas Nmr ◽  
Nmr Study ◽  
High Temperature High Pressure

scholarly journals Sealed rotors for in situ high temperature high pressure MAS NMR

2015 ◽  
Vol 51 (70) ◽  
pp. 13458-13461 ◽  
Author(s):  
Jian Zhi Hu ◽  
Mary Y. Hu ◽  
Zhenchao Zhao ◽  
Suochang Xu ◽  
Aleksei Vjunov ◽  
...  
Keyword(s):  
High Pressure ◽  
High Temperature ◽  
Mas Nmr ◽  
Material Synthesis ◽  
Widespread Application ◽  
High Temperature High Pressure

Perfectly sealed rotors were designed for the widespread application of in situ MAS NMR in catalysis, material synthesis, metabolomics, and more.

In Situ High Temperature Multinuclear NMR Study of Clinker Formation

1998 ◽  
pp. 47-55
Author(s):  
Laurent Bonafous ◽  
Catherine Bessada ◽  
Dominique Massiot ◽  
Jean-Pierre Coutures ◽  
Bruno LeRolland ◽  
...  
Keyword(s):  
High Temperature ◽  
Multinuclear Nmr ◽  
Nmr Study

In Situ Measurement of the Phase Transformation Behavior of Al2O3 Scale during High-Temperature Oxidation using Synchrotron Radiation

2011 ◽  
Vol 696 ◽  
pp. 63-69 ◽  
Author(s):  
Shigenari Hayashi ◽  
Isao Saeki ◽  
Yoshitaka Nishiyama ◽  
Takashi Doi ◽  
Shoji Kyo ◽  
...  
Keyword(s):  
High Temperature ◽  
Synchrotron Radiation ◽  
High Temperature Oxidation ◽  
Structural Changes ◽  
Lattice Parameter ◽  
Transformation Behavior ◽  
Initial Oxidation ◽  
Temperature Oxidation ◽  
Diffraction Peaks

Very thin Fe-coatings, ~50nm, were found to suppress metastable Al2O3 formation on Fe-50Al and Ni-50Al alloys in our previous study. The authors proposed a mechanism whereby α-Al2O3 precipitates from the Al-saturated Fe2O3, which was formed during initial oxidation, since α-Al2O3 and α-Fe2O3 have isomorphous structures. In order to confirm the proposed mechanism, in-situ measurements were made of structural changes in the oxide scales formed on FeAl with and without Fe coating during heating and subsequent isothermal high temperature oxidation by synchrotron radiation with a two-dimensional X-ray detector. Diffraction peaks from Fe2O3 were initially observed at around 350°C on Fe-coated samples. The lattice parameter of the Fe2O3 initially increased linearly due to thermal expansion, but then rapidly decreased due to the formation of a solid solution of Fe2O3-Al2O3. α-Al2O3 started to appear at around 800°C, but no peaks from metastable Al2O3 were observed. The diffraction peaks from the α-Al2O3 on Fe-coated samples consisted of two distinct peaks, indicating that the α-Al2O3 had two different lattice parameters. These results suggest that the α-Al2O3 was formed not only by precipitation from the Al-saturated Fe2O3, but also by oxidation of Al in the substrate.

ChemInform Abstract: Cation Migration in Zeolites: An in situ Powder Diffraction and MAS NMR Study of the Structure of Zeolite Cs(Na)-Y During Dehydration.

ChemInform ◽  
2010 ◽  
Vol 29 (20) ◽  
pp. no-no
Author(s):  
P. NORBY ◽  
F. I. POSHNI ◽  
A. F. GUALTIERI ◽  
J. C. HANSON ◽  
C. P. GREY
Keyword(s):  
Powder Diffraction ◽  
Mas Nmr ◽  
Nmr Study ◽  
Cation Migration

In situ H and C MAS NMR study of the mechanism of H/D exchange for deuterated propane adsorbed on H-ZSM-5

2005 ◽  
Vol 235 (1) ◽  
pp. 221-228 ◽  
Author(s):  
A STEPANOV ◽  
S ARZUMANOV ◽  
M LUZGIN ◽  
H ERNST ◽  
D FREUDE ◽  
...  
Keyword(s):  
Mas Nmr ◽  
Nmr Study
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