Particle size dependent CO dissociation on alumina-supported Rh: a model study

被引：75
作者：
Frank, M
Andersson, S
Libuda, J
Stempel, S
Sandell, A
Brena, B
Giertz, A
Bruhwiler, PA
Baumer, M
Martensson, N
Freund, HJ
机构：
[1] UNIV UPPSALA,DEPT PHYS,S-75121 UPPSALA,SWEDEN
[2] LUND UNIV,DEPT SYNCHROTRON RADIAT RES,S-22100 LUND,SWEDEN
来源：
CHEMICAL PHYSICS LETTERS | 1997年 / 279卷 / 1-2期
关键词：
D O I：
10.1016/S0009-2614(97)01114-7
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：
Via deposition of Ph from the gas phase onto a thin, well-ordered alumina film we have prepared various of alumina-supported Rh particle systems. The morphologies and particle sizes have been characterised with spot profile analysis LEED and STM measurements. The probabilities for thermally induced dissociation of adsorbed CO at temperatures between 350 and 500K were determined from Cls photoelectron spectra. For small aggregates the dissociation activity increases with increasing average particle size. After reaching a maximum for particles containing an average of 500 to 1000 Rh atoms, the fraction of dissociated CO decreases to values closer to those observed on well-prepared Rh single crystal surfaces. (C) 1997 Published by Elsevier Science B.V.
引用
收藏
页码：92 / 99
页数：8
相关论文
共 35 条
[1]  
Andersen J. N., 1991, SYNCHROTRON RAD NEWS, V4, P15
[2]  
ANDERSSON S, UNPUB J CHEM PHYS
[3]   THE GROWTH AND PROPERTIES OF PD AND PT ON AL2O3/NIAL(110) [J].
BAUMER, M ;
LIBUDA, J ;
SANDELL, A ;
FREUND, HJ ;
GRAW, G ;
BERTRAMS, T ;
NEDDERMEYER, H .
BERICHTE DER BUNSEN-GESELLSCHAFT-PHYSICAL CHEMISTRY CHEMICAL PHYSICS, 1995, 99 (11) :1381-1386
[4]  
BAUMER M, IN PRESS SURF SCI
[5]   LEED AND THERMAL DESORPTION STUDIES OF SMALL MOLECULES (H2,O2,CO,CO2,NO,C2H4,C2H2 AND C) CHEMISORBED ON RHODIUM (111) AND (100) SURFACES [J].
CASTNER, DG ;
SEXTON, BA ;
SOMORJAI, GA .
SURFACE SCIENCE, 1978, 71 (03) :519-540
[6]  
CASTNER DG, 1981, SURF SCI, V103, pL134, DOI 10.1016/0039-6028(81)90259-4
[7]   LEED AND THERMAL-DESORPTION STUDIES OF SMALL MOLECULES (H-2, O2, CO, CO2, NO, C2H4, C2H2 AND C) CHEMISORBED ON THE STEPPED RHODIUM (755) AND (331) SURFACES [J].
CASTNER, DG ;
SOMORJAI, GA .
SURFACE SCIENCE, 1979, 83 (01) :60-82
[8]   EPITAXIAL-GROWTH OF ULTRATHIN AL2O3 FILMS ON TA(110) [J].
CHEN, PJ ;
GOODMAN, DW .
SURFACE SCIENCE, 1994, 312 (03) :L767-L773
[9]  
DAYTE AK, 1992, CATAL REV SCI ENG, V34, P129
[10]   DISSOCIATION OF CO ON RH SURFACES [J].
DEKOSTER, A ;
VANSANTEN, RA .
SURFACE SCIENCE, 1990, 233 (03) :366-380
1234