THE INTERACTION OF CARBON-MONOXIDE WITH NICKEL-IRON ALLOYS - A COMPARISON BETWEEN SINGLE-CRYSTAL SURFACES AND SUPPORTED CATALYSTS

被引：21

作者：

BOELLAARD, E ^{[1
]}

VREEBURG, RJ ^{[1
]}

GIJZEMAN, OLJ ^{[1
]}

GEUS, JW ^{[1
]}

机构：

[1] UNIV UTRECHT,DEPT INORGAN CHEM,3508 TB UTRECHT,NETHERLANDS

来源：

JOURNAL OF MOLECULAR CATALYSIS | 1994年 / 92卷 / 03期

关键词：

ALLOYS; CARBON MONOXIDE; CRYSTAL SURFACE; IRON; NICKEL; SUPPORTED CATALYSTS;

D O I：

10.1016/0304-5102(94)00081-6

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 interaction of carbon monoxide with nickel-iron alloys is studied on Ni(111)-Fe surfaces by means of ellipsometry and Auger electron spectroscopy, and by means of infrared spectroscopy on gamma-Al2O3-suppoaed NixFe catalysts. The nickel-to-iron ratio of the alloy strongly affects the interaction with CO. On alloys with an iron atom fraction of 0.3 or less the adsorption of CO is molecular, whereas at fractions higher than 0.4 it is initially dissociative. Surfaces contaminated with carbon and oxygen exhibit a lower heat of adsorption. The presence of pre-adsorbed hydrogen lowers the amount of CO which can be adsorbed on Ni(111)-Fe surfaces, whereas on supported catalysts it leads to the formation of formate species already at room temperature.

引用

页码：299 / 310

页数：12

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