Periodic forcing of NO reduction on a Pt(100) surface

被引：3

作者：

Schütz, E ^{[1
]}

Imbihl, R ^{[1
]}

机构：

[1] Univ Hannover, Inst Phys Chem & Elektrochem, D-30167 Hannover, Germany

来源：

ZEITSCHRIFT FUR PHYSIKALISCHE CHEMIE-INTERNATIONAL JOURNAL OF RESEARCH IN PHYSICAL CHEMISTRY & CHEMICAL PHYSICS | 2002年 / 216卷 / 04期

关键词：

Pt(100) surface; NO reduction; periodic forcing; surface phase transition; surface defects;

D O I：

10.1524/zpch.2002.216.4.509

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 influence of a cycled gas feed on reactions of the automotive catalytic converter has been investigated under low pressure conditions (p < 10(-3) mbar) with a Pt(100) surface as catalyst. Catalytic NO reduction with CO or H-2 as reducing agent was studied in binary mixtures. The reactions were forced around the unstable high rate branch of the rate vs. T hysteresis by applying a square-wave modulation of P-co (p(H2)). For the NO+CO reaction the yield vs frequency dependence exhibits a pronounced maximum. The pressure modulation causes a periodic structural transformation 1 x 1 <----> hex. The frequency dependence of the yield is largely related to the average concentration of defects which are created during the phase transition.

引用

页码：509 / 520

页数：12

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