Á Ð ¢ a Û 090286Pi

Ó{« 2 aÔ  ~ ¯ n ¼ m  XAFS  p  # & : E > A + D  ´ ¿ TEstimation of beamline performance by measuring XAFS of supported fineparticle catalysts
F i  P I aÕ w   ¶ F b

Nobuyuki ICHIKUNI, Eiichi KOBAYASHIa^·koÕbJy/D-C5CDV¥©2D3EChiba University, SAGA Light Source×Öº  ½ : E > A + D BL11  Í  &  ´ ¿ T ) ¹   Õ   À   & Ë x ­ Õ Ë x®   M  É ]   R  ~ w Ë x ¨ )     b ¨ ¼ m À     Õ XAFS  p ) ¹
   Fe K -edge, Co K -edge, Au L I I I -edge, Nb K -edge, Mo K -edge   '  '  e _ ª    XAFS )  p   Ó English Ô To estimate the performance of recently developed BL11, Fe K-edge, Co K-edge, Au
L I I I -edge, Nb K-edge, Mo K-edge XAFS were measured. XAFS samples were metal foils,
metal powders and oxide supported fine particle catalysts.

ØÖ³¥©¤£Û
½:E>A+D BL11 Í&´¿T)¹ ÕXAFS p)¹Fe K edge, CoK edge, Au LIII edge, Nb K edge, Mo K edge ''e_ª XAFS )pptÄËx[À )ZÑ&Ù.BE<
&(i) 8 keV OG K edge )&ÕFe,Co, (ii) 12 keV NÅ L3 edge )& Au, (iii)
20 keV NÅ K edge )& Nb, Mo &LgÕ(i) Fe, Co ÕËx­ÕËx®  ÕNb ! SiO2 
¼mÀ !p ' Nb ,E9+6! 7+5A+6])UÇ& <C@E3E´ vW&1)|ÕÊ Nb  SiO2 t
3 wt%d'&tÕFe, Co Õ0.4 wt%§zQÊ& Õ
Fe " Co  Lytle Yf#&¸VpÕ\!¾ÙÖqÒXrÛXAFSpBL11¹ÕuVSi(111)K±@8-C?E3E#%ZVFe®ÕCo­ÕAu­ÕNb­ÕMo­Õ1 wt%
Au/SiO2ÆÈ#&XAFSp)¹Fe-Nb/SiOÓFe:0.4 wt%Ô#Co-Nb/SiO2
2
ÓCo: 0.4 wt%ÔFe$Co K edge XAFSLytleYf#&¸VXAFS0=-5B)}Õ''ÕMn;*B3E
#Fe;*B3E)¡p4E3»ÕREX2000ÓRigaku Co.Ô)¡
ÚÖ±#²sÛ(i) Fe-and Co K edges
Fig. 1  Fe K edge XAFS p±)¦
4 E 3   p  Ì  Õ Fe ®   11 Z ÕFe-Nb/SiO2  52 Z&ÓÕh¦  Co K edge ÕCo ­ 11 ZÕCo-Nb/SiO2  45 Z Fe c¬ S/N ÓS/BÔ0=-5B)}ÔFe ® 11 ZpÌ 16 Å-1 µl0=-5B}$'& (&FÕ¼mÀ 8+1k&!Õ14 Å-1 »S¡`´0=-5B}$'&(Õ6.7-8.2 keVÓFeÔÕ7.3-8.9 keVÓCoÔÏjÕµl0=-5B}$'& ±Ã &¼mÀ H Co ÕÎ) pH=6.5 Â& ~°  & !$k3 3020100-1002468 10 12 14 16-1k/Å3Fig. 1. k -weighted EXAFS oscillations for Fe Kedge EXAFS.

(ii) Au LIII edge
Au/SiO2 ° Au  Au L3 edge XANES¹+ Fig. 2  (s¨°
("È10 W}l'È$$B-7«&)(d`Q·y¡¸+± (^\\­¦+( *(Fig. 3  Au  Au L3 edge EXAFS 6F4>K+ ½p¼ 11 \'Èp¼ 15.5 Å-1 !§m6F4>Kx&)( *(11.5-13.2 keV .AK3Og#§m XAFS 6F4>Kx&)( ¢³ (Au foil
Au/SiO2

absorbance

1.00.80.6

x100.40.20.011860 11880 11900 11920 11940 11960
photon energy / eV
Fig. 2. Au L3 edge XANES spectra.
Au foilk3 50-502

468 10 12 14 16-1k/Å
3Fig. 3. k -weighted EXAFS oscillations for Au L3edge EXAFS.

Mo foil
20k3 FeNbN/SiO2
Fe foil40(iii) Nb-and Mo K edges
Fig. 4  Mo K edge XAFS p¢+=O9p¼ÈMo  11 \(15 Å-1 !§m6F4>Kx&)(*(Èh Nb K edgeÈNb  16 \ Mo b
S/N 6F4>Kx&)(ÈNb  Mo jaÈ5MEK]:HMCO16+k("ÈNb K edge XAFSp4/J<,OS* 
Mo K edge XAFS  19.6-21.2 keV .AK3Og+p(wÈ18.5-20.2
keVÆNbÇ*È Å.AK3OÁi
#^\q{Å6F4>Kx&)(¢³ (0-2002468 10 12 14 16-1k/Å
3Fig. 4. k -weighted EXAFS oscillations for Mo Kedge EXAFS.

ÊÉPv²ÂÎPfqÄÈNb, Mo Å.AK3Od`(X  XAFS p (+± ÈYºt c"
¾YGIO®¤!)(ËÉ³~ªN¯ÌÉ_¥~1) N. Ichikuni et al., AIP Conf. Proc., 882, 639(2007); Y. Iwama, N. Ichikuni et al., Appl. Catal. A,323, 104 (2007).
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»r n¼ #  VZu|)(µ£´»r{ÃR{#'È)(NLytle [e©Y XAFS p"&)([eÈÀ¿8OIO6J;>Æ%D,K9OÇ¸(¶oUÈT¬+ z(