The effect of H2 and the presence of hot-O(ads) during the decomposition of N2O on platinum

被引：13

作者：

Burch, R ^{[1
]}

Daniells, ST ^{[1
]}

Breen, JP ^{[1
]}

Hu, P ^{[1
]}

机构：

[1] Queens Univ Belfast, Sch Chem, CenTACat, Belfast BT9 5AG, Antrim, North Ireland

来源：

CATALYSIS LETTERS | 2004年 / 94卷 / 1-2期

关键词：

N2O+H-2; platinum; catalysts;

D O I：

10.1023/B:CATL.0000019338.35919.c5

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 decomposition of N2O was studied using a silica-supported Pt catalyst. The catalyst was found to exhibit short-lived activity at low temperatures to yield N-2 and O-(ads), the latter remained adsorbed on the surface and poisoned the active sites. Creation of hot-O-(ads) atoms during N2O decomposition is proposed to allow O-2 desorption at intermediate temperatures. Inclusion of H-2 as a reducing agent greatly enhanced the activity and suppressed low temperature deactivation. Simultaneous and sequential pulsing of N2O and H-2 showed that H-2 inclusion with the N2O gas stream produced the greatest activity. A mechanism involving H-(ads) addition to "hot'' oxygen atoms for H2O formation is proposed.

引用

页码：103 / 108

页数：6

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