The promotional effect of gold in catalysis by palladium-gold

被引：918

作者：

Chen, MS ^{[1
]}

Kumar, D ^{[1
]}

Yi, CW ^{[1
]}

Goodman, DW ^{[1
]}

机构：

[1] Texas A&M Univ, Dept Chem, College Stn, TX 77842 USA

来源：

SCIENCE | 2005年 / 310卷 / 5746期

关键词：

D O I：

10.1126/science.1115800

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Acetoxylation of ethylene to vinyl acetate (VA) was used to investigate the mechanism of the promotional effect of gold (Au) in a palladium (Pd)-Au alloy catalyst. The enhanced rates of VA formation for low Pd coverages relative to high Pd coverages on Au single-crystal surfaces demonstrate that the critical reaction site for VA synthesis consists of two noncontiguous, suitably spaced, Pd monomers. The role of Au is to isolate single Pd sites that facilitate the coupling of critical surface species to product, while inhibiting the formation of undesirable reaction by-products.

引用

页码：291 / 293

页数：3

共 28 条

[21] ELECTRONIC AND CO CHEMISORPTION PROPERTIES OF ULTRATHIN PD FILMS VAPOR-DEPOSITED ON AU(111)
SELLIDJ, A
KOEL, BE
[J]. PHYSICAL REVIEW B, 1994, 49 (12): : 8367 - 8376
[22] Elucidation of the reaction mechanism for the palladium-catalyzed synthesis of vinyl acetate
Stacchiola, D
Calaza, F
Burkholder, L
Schwabacher, AW
Neurock, M
Tysoe, WT
[J]. ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, 2005, 44 (29) : 4572 - 4574
[23] Vinyl acetate formation by the reaction of ethylene with acetate species on oxygen-covered Pd(111)
Stacchiola, D
Calaza, F
Burkholder, L
Tysoe, WT
[J]. JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, 2004, 126 (47) : 15384 - 15385
[24] DIFFERENTIAL SPUTTERING AND SURFACE SEGREGATION - THE ROLE OF ENHANCED DIFFUSION
SWARTZFAGER, DG
ZIEMECKI, SB
KELLEY, MJ
[J]. JOURNAL OF VACUUM SCIENCE & TECHNOLOGY, 1981, 19 (02): : 185 - 191
[25] Onboard fuel conversion for hydrogen-fuel-cell-driven vehicles
Trimm, DL
Önsan, ZI
[J]. CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 2001, 43 (1-2): : 31 - 84
[26] Effect of gold on the HDS activity of supported palladium catalysts
Venezia, AM
La Parola, V
Nicolì, V
Deganello, G
[J]. JOURNAL OF CATALYSIS, 2002, 212 (01) : 56 - 62
[27] Infrared study of CO adsorption on alumina supported palladium particles
Wolter, K
Seiferth, O
Libuda, J
Kuhlenbeck, H
Baumer, M
Freund, HJ
[J]. SURFACE SCIENCE, 1998, 402 (1-3) : 428 - 432
[28] YI CW, IN PRESS J PHYS CH B

← 1 2 3 →