Poisoning of platinum surfaces by hexamethyldisiloxane (HMDS): application to catalytic methane sensors

被引：17

作者：

Ehrhardt, JJ ^{[1
]}

Colin, L ^{[1
]}

Jamois, D ^{[1
]}

机构：

[1] INERIS,F-60550 VERNEUIL,FRANCE

来源：

SENSORS AND ACTUATORS B-CHEMICAL | 1997年 / 40卷 / 2-3期

关键词：

platinum methane sensors; poisoning; X-ray photoelectron spectroscopy; hexamethyldisiloxane; catalytic oxidation of methane;

D O I：

10.1016/S0925-4005(97)80250-X

中图分类号：

O65 [分析化学];

学科分类号：

070302 ; 081704 ;

摘要：

The evolution of the catalytic activity of platinum ribbons towards methane oxidation has been studied as a function of the exposure to hexamethyldisiloxane (HMDS) at various temperatures. Below 950 K, and at moderate exposure, HMDS acts as an inhibitor, the surface is progressively covered by patches of silica and the number of active sites decreases as the exposure to HMDS is increased. Above 950 K, the interaction of platinum with HMDS produces irreversibly the formation of a silica overlayer, the mechanism of the catalytic oxidation of methane is deeply modified. The consequences on the resistance of catalytic methane sensors are analysed as a function of the working conditions. (C) 1997 Elsevier Science S.A.

引用

页码：117 / 124

页数：8

共 21 条

[1] A NEW MICROSENSOR FOR ENVIRONMENTAL MEASUREMENTS [J].