Reduction of N2O by H2 on the Ir(110) surface:: oscillations in rate

被引：18

作者：

Carabineiro, SA ^{[1
]}

Nieuwenhuys, BE ^{[1
]}

机构：

[1] Leiden Univ, Leiden Inst Chem, Gorlaeus Labs, Surface Sci & Heterogeneous Catalysis Grp, NL-2300 RA Leiden, Netherlands

来源：

SURFACE SCIENCE | 2001年 / 495卷 / 1-2期

关键词：

nitrogen oxides; nitrogen molecule; catalysis; chemisorption; surface chemical reaction; thermal desorption; iridium; models of surface chemical reactions; auger electron spectroscopy; low energy election diffraction (LEED); stepped single crystal surfaces;

D O I：

10.1016/S0039-6028(01)01572-2

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 N2O with Ir(1 1 0) and the N2O-H-2 reaction on that surface have been studied in the temperature range from 300 up to 800 K. Decomposition of N2O into N-2 was observed, along with, surprisingly, N2O desorption or formation up to 450 K. Isothermal sustained oscillations in rate were found in the temperature range between 460 and 464 K for H-2/N2O ratios close to 1. The reaction products are N-2 and H2O. N2O oscillates in anti-phase with N-2 and the maxima in H2O formation are "delayed" compared to the maxima in N-2 formation during the oscillations. The period was close to 60 s. A possible explanation for the oscillations is proposed based on a built-up of atomic oxygen on the surface, produced by N2O decomposition, modifying the rate of N2O dissociation until oxygen is released in the form of water. (C) 2001 Elsevier Science B.V. All rights reserved.

引用

页码：1 / 7

页数：7

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