The effect of Si poisons on Co3O4-CeO2 catalyst: comparison with a Pt/Al2O3 catalyst

Shouichi Somekawa; Toshiya Hagiwara

Authors

Shouichi Somekawa Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10 Aomi, Koto-ku, Tokyo 135-0064, Japan
Toshiya Hagiwara Tokyo Metropolitan Industrial Technology Research Institute, 2-4-10 Aomi, Koto-ku, Tokyo 135-0064, Japan

Keywords:

odor control, Si poison, Co3O4-CeO2, honeycomb catalyst, noble metal free

Abstract

The effect of Si poison on conventional Pt/Al₂O₃ catalyst and newly developed Co₃O₄-CeO₂ catalyst have been investigated. The effect of Si poison deactivation on the Co₃O₄-CeO₂ catalyst was smaller than that on the Pt/Al₂O₃ catalyst. Hexamethyldisilazane (HMDS) was used as a model compound to simulate gaseous silicon poisoning. It was suggested that the small amount of Si species (except SiO₂) negatively influenced the Pt catalyst activity. Most of the HMDS was converted into SiO₂ during the reaction, which covered the surface of both catalysts. The SiO₂ was removed when the catalysts were subjected to air blowing treatment.

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