Formation and detection of subsurface oxygen at polycrystalline Pd surfaces

被引：8

作者：

Epling, WS ^{[1
]}

Hoflund, GB ^{[1
]}

Minahan, DM ^{[1
]}

机构：

[1] UNION CARBIDE CORP, CTR TECH, S CHARLESTON, WV 25303 USA

来源：

CATALYSIS LETTERS | 1996年 / 39卷 / 3-4期

关键词：

subsurface oxygen; polycrystalline Fd; ion scattering spectroscopy;

D O I：

10.1007/BF00805580

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：

An ion-sputtered, oxygen-exposed, polycrystalline palladium surface has been studied using ion scattering spectroscopy (ISS) before and after exposures to H-2 and CO. A room-temperature exposure to O-2 for 1 min at 1 x 10(-7) Torr does not yield chemisorbed oxygen in the outermost layer of atoms according to the ISS data. However, subsequent exposure to H-2 or CO induces subsurface oxygen formed during the O-2 exposure to migrate to the surface under a chemical driving force and populate the outermost atomic layer where it is detected by ISS. This study demonstrates that a reductive treatment can increase the oxygen content of a surface and provides a useful method for examining subsurface oxygen.

引用

页码：179 / 182

页数：4

共 31 条

[1] CATALYTIC OXIDATION OF METHANE [J].

ANDERSON, RB ;

STEIN, KC ;

FEENAN, JJ ;

HOFER, LJE .

INDUSTRIAL AND ENGINEERING CHEMISTRY, 1961, 53 (10) :809-812

[2] OXIDATION OF CARBON-MONOXIDE OVER PALLADIUM ON ZIRCONIA PREPARED FROM AMORPHOUS PD-ZR ALLOY .1. BULK STRUCTURAL, MORPHOLOGICAL, AND CATALYTIC PROPERTIES OF CATALYST [J].

BAIKER, A ;

GASSER, D ;

LENZNER, J ;

RELLER, A ;

SCHLOGL, R .

JOURNAL OF CATALYSIS, 1990, 126 (02) :555-571

[3] CATALYTIC COMBUSTION OF METHANE OVER SUPPORTED PALLADIUM CATALYSTS .2. SUPPORT AND POSSIBLE MORPHOLOGICAL EFFECTS [J].

BALDWIN, TR ;

BURCH, R .

APPLIED CATALYSIS, 1990, 66 (02) :359-381

[4] OXIDATION OF CARBON-MONOXIDE OVER PALLADIUM-TIN(IV) OXIDE CATALYSTS - EXAMPLE OF SPILLOVER CATALYSIS [J].

BOND, GC ;

MOLLOY, LR ;

FULLER, MJ .

JOURNAL OF THE CHEMICAL SOCIETY-CHEMICAL COMMUNICATIONS, 1975, (19) :796-797

[5] OXYGEN-STABILIZED RECONSTRUCTIONS OF PD(100) - PHASE-TRANSITIONS DURING OXYGEN DESORPTION [J].

CHANG, SL ;

THIEL, PA ;

EVANS, JW .

SURFACE SCIENCE, 1988, 205 (1-2) :117-142

[6] CO OXIDATION OVER PD AND CU CATALYSTS .3. REDUCED AL2O3-SUPPORTED PD [J].

CHOI, KI ;

VANNICE, MA .

JOURNAL OF CATALYSIS, 1991, 131 (01) :1-21

[7]

CONRAD H, 1977, SURF SCI, V65, P245, DOI 10.1016/0039-6028(77)90305-3

[8] WATER-PROMOTED OXIDATION OF CARBON-MONOXIDE OVER TIN(IV) OXIDE-SUPPORTED PALLADIUM [J].

CROFT, G ;

FULLER, MJ .

NATURE, 1977, 269 (5629) :585-586

[9] NONDESTRUCTIVE DEPTH PROFILE STUDY OF OXYGEN-EXPOSED LARGE-GRAIN SILVER USING ANGLE-RESOLVED AUGER-ELECTRON SPECTROSCOPY AND ION-SCATTERING SPECTROSCOPY [J].

DAVIDSON, MR ;

HOFLUND, GB ;

OUTLAW, RA .

JOURNAL OF VACUUM SCIENCE & TECHNOLOGY A-VACUUM SURFACES AND FILMS, 1991, 9 (03) :1344-1350

[10] HIGHER ALCOHOL SYNTHESIS [J].

FORZATTI, P ;

TRONCONI, E ;

PASQUON, I .

CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1991, 33 (1-2) :109-168

← 1 2 3 4 →