Servizio Comunitario di Informazione in materia di Ricerca e Sviluppo - CORDIS

Thermical treatments in gas flows

The thermal treatment of TWC has shown a reactivation in the catalytic activity during the development of the studies. The thermal treatment has removed the organic poison from the TWC providing an increment in the life cycle of the TWC. The application of the process could be used with many other catalytic system, which involve organic matter: The deposits of this organic matter will deactivate the catalytic surface but this could be recovered by applying the thermal treatment. This procedure has proven to be successful using the methods described:
- Oxygen treatment at 500 to 700ºC.
- Chlorine (0.5-5%)/Oxygen treatment at 300ºC.
- Chlorine (<1%)/Oxygen treatment at 500ºC.
- Hydrochloric acid pre treatment at 300-500ºC.

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