CO diffusion over the alumina support of Pd particle model catalysts

被引：20

作者：

Matolin, V ^{[1
]}

Stara, I ^{[1
]}

机构：

[1] Charles Univ, Fac Math & Phys, Dept Elect & Vacuum Phys, CR-18000 Prague 8, Czech Republic

来源：

SURFACE SCIENCE | 1998年 / 398卷 / 1-2期

关键词：

aluminium oxide; carbon monoxide; clusters; diffusion and migration; palladium; sticking; surface diffusion;

D O I：

10.1016/S0039-6028(98)80016-2

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：

The CO adsorption rate of alumina-supported Pd particles increases with CO diffusion over the support surface. The diffusion of admolecules is interrupted by desorption or by trapping by catalyst particles. The mean diffusion length determines the width of the so-called "capture zones" around the particle. In molecular beam scattering studies, an Increase in diffusion length and consequently in capture-zone width is observed as the sticking probability S-i of the impinging molecule increases. In this study, the parameter S-i is determined for CO interaction with Pd particles supported on different types of alumina substrates as a function of substrate temperature. The results allow an evaluation of the adsorption probability of CO on alumina as well as the mean diffusion length versus substrate temperature. (C) 1998 Elsevier Science B.V.

引用

页码：117 / 124

页数：8

共 23 条

[1] THE ORIGINS OF PARTICLE-SIZE EFFECTS IN HETEROGENEOUS CATALYSIS [J].

BOND, GC .

SURFACE SCIENCE, 1985, 156 (JUN) :966-981

[2] STUDY OF CO, NO, AND H-2 ADSORPTION ON MODEL PD/ALPHA-AL2O3(0001) CATALYSTS [J].

CORDATOS, H ;

BUNLUESIN, T ;

GORTE, RJ .

SURFACE SCIENCE, 1995, 323 (03) :219-227

[3]

DOERING DL, 1982, J CATAL, V73, P104, DOI 10.1016/0021-9517(82)90085-9

[4] UHV STUDIES OF THE INTERACTION OF CO WITH SMALL SUPPORTED METAL PARTICLES, NI MICA [J].

DOERING, DL ;

DICKINSON, JT ;

POPPA, H .

JOURNAL OF CATALYSIS, 1982, 73 (01) :91-103

[5] CHEMISORPTIONAL BEHAVIOR OF PD SMALL SUPPORTED PARTICLES DEPENDING ON SIZE AND STRUCTURE - TDS, SSIMS AND TEM INVESTIGATION [J].

GILLET, E ;

CHANNAKHONE, S ;

MATOLIN, V ;

GILLET, M .

SURFACE SCIENCE, 1985, 152 (APR) :603-614

[6]

GOYHENEX C, 1996, SURF SCI, V35, P457

[7] ADSORPTION - DESORPTION-KINETICS ON EPITAXIALLY ORIENTED PALLADIUM CLUSTERS [J].

HENRY, CR ;

CHAPON, C ;

DURIEZ, C .

ZEITSCHRIFT FUR PHYSIK D-ATOMS MOLECULES AND CLUSTERS, 1991, 19 (1-4) :347-351

[8] ON THE EFFECT OF THE DIFFUSION OF CARBON-MONOXIDE ON THE SUBSTRATE DURING CO OXIDATION ON SUPPORTED PALLADIUM CLUSTERS [J].

HENRY, CR .

SURFACE SCIENCE, 1989, 223 (03) :519-526

[9] SIZE EFFECT IN THE CO CHEMISORPTION ON PALLADIUM CLUSTERS SUPPORTED ON MAGNESIUM-OXIDE [J].

HENRY, CR ;

CHAPON, C ;

GOYHENEX, C ;

MONOT, R .

SURFACE SCIENCE, 1992, 272 (1-3) :283-288

[10] Study of CO interaction with alumina-supported Pd particles [J].

Jungwirthova, I ;

Stara, I ;

Matolin, V .

SURFACE SCIENCE, 1997, 377 (1-3) :644-649

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