LONG AND SHORT-RANGE EFFECT OF ALKALI PROMOTERS ON METAL-SURFACES - K ON RH(111)

被引：15

作者：

JANSSENS, TVW

WANDELT, K

NIEMANTSVERDRIET, JW

机构：

[1] EINDHOVEN UNIV TECHNOL,SCHUIT INST CATALYSIS,5600 MB EINDHOVEN,NETHERLANDS

[2] UNIV BONN,INST PHYS & THEORET CHEM,W-5300 BONN 1,GERMANY

来源：

CATALYSIS LETTERS | 1993年 / 19卷 / 2-3期

关键词：

ALKALI; POTASSIUM; PROMOTER; RHODIUM; SURFACE POTENTIAL; UPS;

D O I：

10.1007/BF00771763

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：

Photoemission of physisorbed noble gases has been used to investigate the variation of the surface potential on a potassium-promoted rhodium (111) surface. The results confirm that the predominant effect of potassium is to lower the potential on nearest neighbour sites by 1-1.5 eV, but indicate also that the potential on next nearest neighbour sites is still 0.4-1 eV lower than on unpromoted rhodium, depending on the potassium coverage. Theoretical calculations show that the latter values are in qualitative agreement with the cumulative effect of potassium /rhodium dipoles which form an ordered array on the surface.

引用

页码：263 / 272

页数：10

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