A study of cation environment and movement during dehydration and reduction of nickel-exchanged zeolite Y by x-ray absorption and diffraction

1991 ◽  
Vol 95 (11) ◽  
pp. 4514-4521 ◽  
Author(s):  
E. Dooryhee ◽  
C. R. A. Catlow ◽  
J. W. Couves ◽  
P. J. Maddox ◽  
J. M. Thomas ◽  
...  
Keyword(s):  
Zeolite Y ◽  
X Ray ◽  
X Ray Absorption

scholarly journals Surface Chemistry Of Heterobimetallic Ge-M (M = Mo, W) Complexes In Zeolite Y

1991 ◽  
Vol 233 ◽  
Author(s):  
Aticha Borvornwattananont ◽  
Karin Moller ◽  
Thomas Bein
Keyword(s):  
Room Temperature ◽  
Zeolite Y ◽  
In Situ Ftir ◽  
Nay Zeolite ◽  
Zeolite Framework ◽  
Hy Zeolite ◽  
X Ray ◽  
Proton Form ◽  
X Ray Absorption

ABSTRACTThe intrazeolite chemistry of the two germylene complexes Cl2(THF)GeM(CO)5(M = Mo, W) was studied with x-ray absorption spectroscopy (Ge, Mo, W edge EXAFS) and in-situ FTIR/TPD-MS techniques. The slightly decarbonylated GeMo complex interacts with the framework of NaY zeolite at room temperature and retains the Ge-Mo bond up to about 100° C. In proton-loaded HY zeolite, framework interactions increase at elevated temperature, and the attached complex retains the Ge-Mo bond up to about 120° C. The Ge-Mo bond is cleaved at higher temperatures. MoC1x and Mo-Mo species are formed in NaY and HY zeolite, respectively, while GeClx fragments are anchored to the zeolite framework.The complex Cl2 (THF)GeW(CO) 5 retains all five CO ligands up to about 100° C in both NaY and the proton form. Detectable anchoring occurs at room temperature in NaY and at about 80° C in the proton form. WC1x species are formed upon cleavage of the Ge-W bond at higher temperatures.

X-Ray absorption and photoelectron spectroscopic investigation of vanadium interaction with NH4+- and Eu3+-exchanged zeolite-Y following calcination and steam treatment

2002 ◽  
Vol 12 (10) ◽  
pp. 3034-3038 ◽  
Author(s):  
Lorenza Agasi ◽  
Frank J. Berry ◽  
Massimo Carbucicchio ◽  
Jos?? F. Marco ◽  
Michael Mortimer ◽  
...  
Keyword(s):  
Spectroscopic Investigation ◽  
Zeolite Y ◽  
Steam Treatment ◽  
X Ray ◽  
X Ray Absorption

The location of europium in Eu3+-exchanged zeolite-Y as determined by extended X-ray absorption fine structure (EXAFS) investigations at 77 K

2000 ◽  
Vol 10 (9) ◽  
pp. 2131-2136 ◽  
Author(s):  
Frank J. Berry ◽  
Massimo Carbucicchio ◽  
Alessandra Chiari ◽  
Clive Johnson ◽  
Elaine A. Moore ◽  
...  
Keyword(s):  
Fine Structure ◽  
Zeolite Y ◽  
X Ray ◽  
Absorption Fine ◽  
X Ray Absorption

X-ray microanalysis of thin specimens in the transmission electron microscope at voltages up to 1000 Kv.

1978 ◽  
Vol 36 (1) ◽  
pp. 540-541
Author(s):  
G. Cliff ◽  
M.J. Nasir ◽  
G.W. Lorimer ◽  
N. Ridley
Keyword(s):  
Electron Microscope ◽  
Transmission Electron Microscope ◽  
Weight Fraction ◽  
Present Series ◽  
Constant Independent ◽  
X Ray ◽  
Transmission Electron ◽  
Series Of Experiments ◽  
Image Position ◽  
X Ray Absorption

In a specimen which is transmission thin to 100 kV electrons - a sample in which X-ray absorption is so insignificant that it can be neglected and where fluorescence effects can generally be ignored (1,2) - a ratio of characteristic X-ray intensities, I1/I2 can be converted into a weight fraction ratio, C1/C2, using the equationwhere k12 is, at a given voltage, a constant independent of composition or thickness, k12 values can be determined experimentally from thin standards (3) or calculated (4,6). Both experimental and calculated k12 values have been obtained for K(11<Z>19),kα(Z>19) and some Lα radiation (3,6) at 100 kV. The object of the present series of experiments was to experimentally determine k12 values at voltages between 200 and 1000 kV and to compare these with calculated values.The experiments were carried out on an AEI-EM7 HVEM fitted with an energy dispersive X-ray detector.

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