TY - JOUR
T1 - PTRF X-ray absorption fine structure as a new technique for catalyst characterization
AU - Chun, W. J.
AU - Shirai, M.
AU - Tomishige, K.
AU - Asakura, K.
AU - Iwasawa, Y.
PY - 1996
Y1 - 1996
N2 - A chamber for observation in situ of polarized total-reflection fluorescence extended X-ray absorption fine structure (PTRF-XAFS) spectra was constructed, which makes it possible to measure the PTRF-XAFS spectra in situ under preparation, treatment, and reaction conditions from high vacuum( 1×10-9 Pa) to high pressure( 1×105Pa) and from low temperature(100 K) to high temperature(800 K). The PTRF-XAFS technique can provide information on asymmetric or anisotropic structure of active metal and metal-oxide sites supported on single crystal substrates as models for supported catalysts, by measuring bondings of supported species in two or three different directions parallel and perpendicular to the surface independently. Typical EXAFS and XANES spectra for Cu2+/α-SiO2 (0001), CoOx/α-Al2O3 (0001), [Pt]4/α-Al2O3 (0001), and V2O5/ZrO2 (100) taken by the PTRF-XAFS chamber are discussed in relation to their catalytic properties.
AB - A chamber for observation in situ of polarized total-reflection fluorescence extended X-ray absorption fine structure (PTRF-XAFS) spectra was constructed, which makes it possible to measure the PTRF-XAFS spectra in situ under preparation, treatment, and reaction conditions from high vacuum( 1×10-9 Pa) to high pressure( 1×105Pa) and from low temperature(100 K) to high temperature(800 K). The PTRF-XAFS technique can provide information on asymmetric or anisotropic structure of active metal and metal-oxide sites supported on single crystal substrates as models for supported catalysts, by measuring bondings of supported species in two or three different directions parallel and perpendicular to the surface independently. Typical EXAFS and XANES spectra for Cu2+/α-SiO2 (0001), CoOx/α-Al2O3 (0001), [Pt]4/α-Al2O3 (0001), and V2O5/ZrO2 (100) taken by the PTRF-XAFS chamber are discussed in relation to their catalytic properties.
KW - Anisotropic structure analysis
KW - Asymmetric structure analysis
KW - Chamber in situ XAFS
KW - Orientation of surface bonds
KW - Surfaces
KW - X-ray absorption fine structure (XAFS)
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U2 - 10.1016/1381-1169(95)00163-8
DO - 10.1016/1381-1169(95)00163-8
M3 - Article
AN - SCOPUS:0030572063
SN - 1381-1169
VL - 107
SP - 55
EP - 65
JO - Journal of Molecular Catalysis A: Chemical
JF - Journal of Molecular Catalysis A: Chemical
IS - 1-3
ER -