scholarly journals X-ray spectroscopic and scattering methods applied to the characterisation of cobalt-based Fischer–Tropsch synthesis catalysts

2016 ◽  
Vol 6 (15) ◽  
pp. 5773-5791 ◽  
Author(s):  
Jennifer J. Herbert ◽  
Pierre Senecal ◽  
David J. Martin ◽  
Wim Bras ◽  
Simon K. Beaumont ◽  
...  
Keyword(s):  
Distribution Function ◽  
Absorption Spectroscopy ◽  
Pair Distribution Function ◽  
Tropsch Synthesis ◽  
X Ray Diffraction ◽  
Fischer Tropsch ◽  
X Ray ◽  
Synthesis Catalysts ◽  
Fisher Tropsch Synthesis ◽  
X Ray Absorption

This review aims to critically assess the use of X-ray techniques, both of a scattering (e.g. X-ray diffraction (XRD), pair distribution function (PDF)) and spectroscopic nature (X-ray absorption spectroscopy (XAFS)), in the study of cobalt-based Fisher–Tropsch synthesis (FTS) catalysts.

scholarly journals Effects of crystallite size on the structure and magnetism of ferrihydrite

2016 ◽  
Vol 3 (1) ◽  
pp. 190-202 ◽  
Author(s):  
Xiaoming Wang ◽  
Mengqiang Zhu ◽  
Luuk K. Koopal ◽  
Wei Li ◽  
Wenqian Xu ◽  
...  
Keyword(s):  
Magnetic Properties ◽  
Distribution Function ◽  
Crystallite Size ◽  
Absorption Spectroscopy ◽  
Pair Distribution Function ◽  
X Ray Diffraction ◽  
X Ray ◽  
X Ray Absorption

The structure and magnetic properties of nano-sized (1.6 to 4.4 nm) ferrihydrite samples are systematically investigated through a combination of X-ray diffraction (XRD), X-ray pair distribution function (PDF), X-ray absorption spectroscopy (XAS) and magnetic analyses.

Co-Promoted Cu/ZnO Catalysts for Fischer-Tropsch Synthesis

2017 ◽  
Vol 266 ◽  
pp. 117-121
Author(s):  
Piyasak Akcaboot ◽  
Napat Kanokpornwasin ◽  
Monthida Raoarun ◽  
Patraporn Saiwattanasuk ◽  
Pinsuda Viravathana
Keyword(s):  
Tropsch Synthesis ◽  
Precipitation Method ◽  
X Ray Diffraction ◽  
Fischer Tropsch ◽  
Edge Structure ◽  
Fischer Tropsch Synthesis ◽  
X Ray ◽  
Cu Foil ◽  
Co Precipitation ◽  
X Ray Absorption

Co-promoted Cu/ZnO catalysts were studied for Fischer-Tropsch synthesis (FTS). All catalysts were prepared by the co-precipitation method, having the mass ratio of Co:Cu:Zn=0 (unpromoted), 0.05, 0.5:1:1, and characterized by X-ray diffraction (XRD), X-ray absorption spectroscopy (XAS), including X-ray absorption near edge structure (XANES) and extended X-ray absorption fine structure (EXAFS). From XRD and XAS, the results confirmed the phase transformation of CuO to Cu foil and Co3O4 to Co foil in Co-promoted catalysts after reduction. After FTS reaction testing, the Co-promoted catalysts showed the decrease in methanol selectivity of 15 and 1.6% for 0.05Co-Cu/ZnO and 0.5Co-Cu/ZnO, respectively, and the increase in C5-C15 selectivity during 30 h of reaction.

Doping effect on the local structure of metamagnetic Co doped Ni/NiO:GO core–shell nanoparticles using X-ray absorption spectroscopy and the pair distribution function

2019 ◽  
Vol 21 (3) ◽  
pp. 1294-1307 ◽  
Author(s):  
U. P. Gawai ◽  
D. K. Gaikwad ◽  
M. R. Bodke ◽  
H. A. Khawal ◽  
K. K. Pandey ◽  
...  
Keyword(s):  
Distribution Function ◽  
Absorption Spectroscopy ◽  
Local Structure ◽  
Pair Distribution Function ◽  
Core Shell ◽  
Shell Nanoparticles ◽  
X Ray ◽  
Core Shell Nanoparticles ◽  
X Ray Absorption ◽  
Co Doped

Core–shell nanoparticles of Co doped Ni/NiO and incorporated GO sheets evidenced that the metamagnetic behavior at 5 K to 300 K temperatures.

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