OSCILLATORY BEHAVIOR OF THE NO-H-2 REACTION OVER RH(533)

被引:31
作者
JANSSEN, NMH
NIEUWENHUYS, BE
IKAI, M
TANAKA, K
CHOLACH, AR
机构
[1] LEIDEN UNIV,LEIDEN INST CHEM,GORLAEUS LABS,2300 RA LEIDEN,NETHERLANDS
[2] UNIV TOKYO,INST SOLID STATE PHYS,MINATO KU,TOKYO 106,JAPAN
[3] NOVOSIBIRSK CATALYSIS INST,NOVOSIBIRSK 630090,RUSSIA
关键词
D O I
10.1016/0039-6028(94)90586-X
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
Waves moving over the surface of a Rh field emitter tip in an oscillatory way during the NO-H-2 reaction have been visualized earlier by field electron microscopy (FEM). An autocatalysis model has been proposed to describe the oscillatory behaviour of the reduction of NO by H-2. To study the oscillatory behaviour and the effect of the surface structure in more detail a large Rh(100) surface and a large stepped Rh(533) surface, Rh[4(111)*(100)], have been selected. The first results show that, in correspondence with the FEM experiments, rate oscillations could be observed over the Rh(533) surface in the 10(-6) mbar pressure regime around 470 K. No oscillatory behaviour was obtained on the Rh(100) surface under these conditions. The structure-sensitivity of the process is related to the large dependence of the Rh-N bond strength on the surface structure. Nitrogen desorbs at a much higher temperature from Rh(100) than from Rh(533).
引用
收藏
页码:L29 / L33
页数:5
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