FTIR STUDIES OF SELF-SUSTAINED OSCILLATIONS DURING THE CO—NO—O₂ REACTION ON Pt/SiO₂ CATALYSTS

Abstract

Nonisothermal oscillations have been observed via FTTR spectroscopy during the CO—NO—O₂ reaction over a 5 wt% Pt/SiO₂ catalyst. Behavior of the surface species of CO and NO depended on the NO/CO feed ratio, but not on the O₂/CO ratio. Oscillations of the surface species were not always correlated with oscillations in CO₂ production and surface temperature. Surface temperature measurements provide evidence of spatial nonuniformity of the reaction on the catalyst wafer, which explain the discrepancies in the CO₂ production versus surface behavior correlations.

KEYWORDS:

• Oscillations
• CO—NO—O₂
• Pt/SiO₂
• FTIR

Notes

†To whom correspondence should be addressed.