EDGE AND EXAFS STUDY OF CHARCOAL SUPPORTED Pt-Fe CATALYSTS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-297-C8-300 ◽  
Author(s):  
B. MORAWECK ◽  
P. BONDOT ◽  
D. GOUPIL ◽  
P. FOUILLOUX ◽  
A. J. RENOUPREZ
Keyword(s):  
Exafs Study ◽  
Fe Catalysts

EXAFS Study of Refractory Cement Phases: CaAl2O14H20, Ca2Al2O13H16, and Ca3Al2O12H12

1995 ◽  
Vol 5 (11) ◽  
pp. 1849-1864 ◽  
Author(s):  
N. Richard ◽  
N. Lequeux ◽  
P. Boch
Keyword(s):  
Refractory Cement ◽  
Exafs Study

EXAFS STUDY ON RADIATION INDUCED DEFECTS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-1045-C8-1048
Author(s):  
T. BOLZE ◽  
J. PEISL
Keyword(s):  
Radiation Induced ◽  
Exafs Study ◽  
Induced Defects

EXAFS STUDY OF c-Si, a-Si AND a-Si : H

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-379-C8-382 ◽  
Author(s):  
A. MENELLE ◽  
A. M. FLANK ◽  
P. LAGARDE ◽  
R. BELLISSENT
Keyword(s):  
Exafs Study

EXAFS STUDY OF NICKEL AND IRON PRECURSORS OF HOMOGENEOUS ZIEGLER-TYPE HYDROGENATION CATALYSTS

1986 ◽  
Vol 47 (C8) ◽  
pp. C8-243-C8-248 ◽  
Author(s):  
C. ESSELIN ◽  
E. BAUER-GROSSE ◽  
J. GOULON ◽  
C. WILLIAMS ◽  
Y. CHAUVIN ◽  
...  
Keyword(s):  
Hydrogenation Catalysts ◽  
Exafs Study

Tri-Reforming of Methane over NdM0.25Ni0.75O3 (M = Cr, Fe) Catalysts and the Effect of CO2 Composition

2021 ◽  
Author(s):  
K. T. de C. Roseno ◽  
R. A. Antunes ◽  
R. M. B. Alves ◽  
M. Schmal
Keyword(s):  
Fe Catalysts

Bimetallic Pt-Fe catalysts supported on mesoporous TS-1 microspheres for the liquid-phase selective hydrogenation of cinnamaldehyde

2021 ◽  
Vol 395 ◽  
pp. 375-386
Author(s):  
Wenbo Zhang ◽  
Huiyue Xin ◽  
Yaqiong Zhang ◽  
Xin Jin ◽  
Peng Wu ◽  
...  
Keyword(s):  
Liquid Phase ◽  
Selective Hydrogenation ◽  
Fe Catalysts

scholarly journals Influence of Ni on Fe and Co-Fe Based Catalysts for High-Calorific Synthetic Natural Gas

Catalysts ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 697
Author(s):  
Tae-Young Kim ◽  
Seongbin Jo ◽  
Yeji Lee ◽  
Suk-Hwan Kang ◽  
Joon-Woo Kim ◽  
...  
Keyword(s):  
Natural Gas ◽  
Catalytic Performance ◽  
Impregnation Method ◽  
Ni Catalysts ◽  
Hydrocarbon Production ◽  
Synthetic Natural Gas ◽  
Fe Catalyst ◽  
Ni Addition ◽  
Hydrocarbon Yield ◽  
Fe Catalysts

Fe-Ni and Co-Fe-Ni catalysts were prepared by the wet impregnation method for the production of high-calorific synthetic natural gas. The influence of Ni addition to Fe and Co-Fe catalyst structure and catalytic performance was investigated. The results show that the increasing of Ni amount in Fe-Ni and Co-Fe-Ni catalysts increased the formation of Ni-Fe alloy. In addition, the addition of nickel to the Fe and Co-Fe catalysts could promote the dispersion of metal and decrease the reduction temperature. Consequently, the Fe-Ni and Co-Fe-Ni catalysts exhibited higher CO conversion compared to Fe and Co-Fe catalysts. A higher Ni amount in the catalysts could increase C1–C4 hydrocarbon production and reduce the byproducts (C5+ and CO2). Among the catalysts, the 5Co-15Fe-5Ni/γ-Al2O3 catalyst affords a high light hydrocarbon yield (51.7% CH4 and 21.8% C2–C4) with a low byproduct yield (14.1% C5+ and 12.1% CO2).

Local atomic structure in tetragonal pure ZrO2nanopowders

2010 ◽  
Vol 43 (2) ◽  
pp. 227-236 ◽  
Author(s):  
Leandro M. Acuña ◽  
Diego G. Lamas ◽  
Rodolfo O. Fuentes ◽  
Ismael O. Fábregas ◽  
Márcia C. A. Fantini ◽  
...  
Keyword(s):  
Tetragonal Phase ◽  
Local Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
Atomic Structures ◽  
Crystallite Sizes ◽  
Exafs Study ◽  
The Difference ◽  
X Ray Absorption ◽  
Good Agreement

The local atomic structures around the Zr atom of pure (undoped) ZrO2nanopowders with different average crystallite sizes, ranging from 7 to 40 nm, have been investigated. The nanopowders were synthesized by different wet-chemical routes, but all exhibit the high-temperature tetragonal phase stabilized at room temperature, as established by synchrotron radiation X-ray diffraction. The extended X-ray absorption fine structure (EXAFS) technique was applied to analyze the local structure around the Zr atoms. Several authors have studied this system using the EXAFS technique without obtaining a good agreement between crystallographic and EXAFS data. In this work, it is shown that the local structure of ZrO2nanopowders can be described by a model consisting of two oxygen subshells (4 + 4 atoms) with different Zr—O distances, in agreement with those independently determined by X-ray diffraction. However, the EXAFS study shows that the second oxygen subshell exhibits a Debye–Waller (DW) parameter much higher than that of the first oxygen subshell, a result that cannot be explained by the crystallographic model accepted for the tetragonal phase of zirconia-based materials. However, as proposed by other authors, the difference in the DW parameters between the two oxygen subshells around the Zr atoms can be explained by the existence of oxygen displacements perpendicular to thezdirection; these mainly affect the second oxygen subshell because of the directional character of the EXAFS DW parameter, in contradiction to the crystallographic value. It is also established that this model is similar to another model having three oxygen subshells, with a 4 + 2 + 2 distribution of atoms, with only one DW parameter for all oxygen subshells. Both models are in good agreement with the crystal structure determined by X-ray diffraction experiments.

EXAFS-study of solvophobic interaction in the system krypton-ethanol

1992 ◽  
Vol 52 ◽  
pp. 1-13 ◽  
Author(s):  
H. Bertagnolli ◽  
M. Hoffmann ◽  
D. Peter
Keyword(s):  
Exafs Study
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