Quantitative analysis of hydrogen adsorbed on Pt particles on SiO2 in the presence of coadsorbed CO by means of L-3-edge X-ray absorption near-edge structure spectroscopy

被引：26
作者：
Kubota, T
Asakura, K
Iwasawa, Y
机构：
[1] UNIV TOKYO,DEPT CHEM,GRAD SCH SCI,BUNKYO KU,TOKYO 113,JAPAN
[2] UNIV TOKYO,FAC SCI,RES CTR SPECTROCHEM,BUNKYO KU,TOKYO 113,JAPAN
来源：
CATALYSIS LETTERS | 1997年 / 46卷 / 3-4期
关键词：
X-ray absorption near-edge structure (XANES); adsorbed hydrogen; adsorbed CO; Pt/SiO2;
D O I：
10.1023/A:1019087006275
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
X-ray absorption near-edge structure (XANES) spectra at the Pt L-3-edge for Pt particles supported on SiO2 under CO adsorption and CO + H-2 coadsorption were recorded to analyze the amount of adsorbed hydrogen in the coadsorbed state on the Pt particles. Adsorbed CO on the Pt particles revealed a new peak at 6 eV above the Pt L-3-edge in the difference spectra before and after CO adsorption in the coverage range 0.10-0.51. Subsequent adsorption of hydrogen at various coverages on the CO-preadsorbed Pt particles broadened and shifted the peak to the higher energy side. The peak was deconvoluted to two components due to adsorbed hydrogen and CO by a linear least-squares fitting technique. It was found that the fitting coefficient with respect to adsorbed hydrogen was proportional to the amount of adsorbed hydrogen. The XANES difference spectra provide a quantitative analysis method for adsorbed hydrogen on supported Pt particles in the presence of coadsorbates like CO.
引用
收藏
页码：141 / 144
页数：4
相关论文
共 11 条
[1]   A new characterization method for adsorbed hydrogen on supported Pt particles [J].
Asakura, K ;
Kubota, T ;
Ichikuni, N ;
Iwasawa, Y .
11TH INTERNATIONAL CONGRESS ON CATALYSIS - 40TH ANNIVERSARY, PTS A AND B, 1996, 101 :911-919
[2]   In situ core-electron spectroscopy of carbon monoxide adsorbed on high-area platinum in an acid electrolyte [J].
Bae, IT ;
Scherson, DA .
JOURNAL OF PHYSICAL CHEMISTRY, 1996, 100 (50) :19215-19217
[3]   THE ADSORPTION OF CO, O2, AND H-2 ON PT(100)-(5X20) [J].
BARTEAU, MA ;
KO, EI ;
MADIX, RJ .
SURFACE SCIENCE, 1981, 102 (01) :99-117
[4]   HYDROGEN ADSORPTION ON SILICA-SUPPORTED PLATINUM STUDIED BY H-1-NMR SPECTROSCOPY [J].
CHESTERS, MA ;
PACKER, KJ ;
LENNON, D ;
VINER, HE .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1995, 91 (14) :2191-2201
[5]   H-1-NMR OF HYDROGEN CHEMISORBED ON SILICA-SUPPORTED PLATINUM PARTICLES - AN EVALUATION OF DIFFERENT MODELS [J].
CHESTERS, MA ;
PACKER, KJ ;
VINER, HE ;
WRIGHT, MAP ;
LENNON, D .
JOURNAL OF THE CHEMICAL SOCIETY-FARADAY TRANSACTIONS, 1995, 91 (14) :2203-2206
[6]   INTERACTION OF HYDROGEN WITH SOLID-SURFACES [J].
CHRISTMANN, K .
SURFACE SCIENCE REPORTS, 1988, 9 (1-3) :1-163
[7]   EFFECTS OF DISPERSION ON THE ACTIVITY AND SELECTIVITY OF ALUMINA-SUPPORTED RUTHENIUM CATALYSTS FOR CARBON-MONOXIDE HYDROGENATION [J].
KELLNER, CS ;
BELL, AT .
JOURNAL OF CATALYSIS, 1982, 75 (02) :251-261
[8]   A new method for quantitative characterization of adsorbed hydrogen on Pt particles by means of Pt L-edge XANES [J].
Kubota, T ;
Asakura, K ;
Ichikuni, N ;
Iwasawa, Y .
CHEMICAL PHYSICS LETTERS, 1996, 256 (4-5) :445-448
[9]   CO-induced decomposition of small Pt particles in K-LTL zeolite [J].
Mojet, BL ;
Koningsberger, DC .
CATALYSIS LETTERS, 1996, 39 (3-4) :191-196
[10]  
Paal Z., 1988, HYDROGEN EFFECTS CAT
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