NO+H-2 reaction on Pt-Ru/SiO2 catalysts: Correlation between nanostructure and catalytic activity and selectivity

被引：10

作者：

Diaz, G

GomezCortes, A

Benaissa, M

机构：

[1] Instituto de Física, Univ. Nac. Auton. de México, Mexico 01000

来源：

CATALYSIS LETTERS | 1996年 / 38卷 / 1-2期

关键词：

NOx reduction; bimetallic catalysts; HREM;

D O I：

10.1007/BF00806901

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：

Nitric oxide reduction by hydrogen has been studied on Pt-Ru/SiO2 catalysts of various Pt/Ru atomic compositions in the temperature range 298-673 K. Physical characterization showed the presence of bimetallic particles which tend to be Pt-rich. The overall activity of the bimetallic catalysts suggests a dilution of the active component (Pt) in the range 373-523 K. The addition of Ru results in a general improvement of the N-2 selectivity and significant modifications in the product distribution are observed as a function of the catalyst composition. A bimetallic particle model is proposed in which various types of surfaces are exposed including those with pure Pt atoms and/or Pt-Ru mixture. This model allows to explain the overall activity and selectivity in the whole series of catalysts.

引用

页码：63 / 72

页数：10

共 25 条

[1] PREPARATION AND CHARACTERIZATION OF SUPPORTED PT-RU BIMETALLIC CLUSTERS - STRONG PRECURSOR SUPPORT INTERACTIONS
ALERASOOL, S
GONZALEZ, RD
[J]. JOURNAL OF CATALYSIS, 1990, 124 (01) : 204 - 216
[2] BANHOLZER WF, 1983, SURF SCI, V128, P176, DOI 10.1016/0039-6028(83)90389-8
[3] NITRIC-OXIDE REDUCTION WIT HYDROGEN ON MIXED METAL-OXIDE CATALYSTS
BAUERLE, GL
NOBE, K
[J]. INDUSTRIAL & ENGINEERING CHEMISTRY PRODUCT RESEARCH AND DEVELOPMENT, 1974, 13 (03): : 185 - 193
[4] HIGH-TEMPERATURE CHEMISTRY OF RUTHENIUM-OXYGEN SYSTEM
BELL, WE
TAGAMI, M
[J]. JOURNAL OF PHYSICAL CHEMISTRY, 1963, 67 (11) : 2432 - &
[5] UV PHOTOEMISSION STUDY OF NO AND CO ADSORPTION ON PT (100) AND RU (1010) SURFACES
BONZEL, HP
FISCHER, TE
[J]. SURFACE SCIENCE, 1975, 51 (01) : 213 - 227
[6] HYDROGENOLYSIS OF METHYLCYCLOPENTANE AND ISOMERIZATION OF 2-METHYLPENTANE OVER WELL CHARACTERIZED SILICA-SUPPORTED PLATINUM-RUTHENIUM CATALYSTS
DIAZ, G
GARIN, F
MAIRE, G
ALERASOOL, S
GONZALEZ, RD
[J]. APPLIED CATALYSIS A-GENERAL, 1995, 124 (01) : 33 - 46
[7] REDUCTION OF NO BY H-2 OVER SILICA-SUPPORTED RHODIUM - INFRARED AND KINETIC-STUDIES
HECKER, WC
BELL, AT
[J]. JOURNAL OF CATALYSIS, 1985, 92 (02) : 247 - 259
[8] MECHANISMS OF THE VARIOUS NITRIC-OXIDE REDUCTION REACTIONS ON A PLATINUM RHODIUM (100) ALLOY SINGLE-CRYSTAL SURFACE
HIRANO, H
YAMADA, T
TANAKA, KI
SIERA, J
COBDEN, P
NIEUWENHUYS, BE
[J]. SURFACE SCIENCE, 1992, 262 (1-2) : 97 - 112
[9] HUMEROTHERY W, 1963, ELECT ATOMS METALS A
[10] JOSEYACAMAN M, 1995, MATER RES SOC S P, V398, P133

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