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

Clarification of deactivation mechanisms of investigated elements

The countermeasures concerning the catalyst deactivation largely depend on the deactivation mechanism of catalyst poisons. Therefore, the understanding of the mechanisms leading to deactivation is essential.

Within the consortium, the behaviour of alkali metals, especially of potassium as a constituent of biomass was the focus of investigations of the Scandinavian partners. The primary deactivating compounds were identified and the deactivation potential of their aerosols in a synthetic flue gas was verified.

The activities of the German partners concentrated on the element phosphorus as a deactivating compound present in secondary fuel such as meat-and-bone meal (MBM) and sewage sludge. Lab scale tests showed the deactivation potential of volatile phosphorus, which was further confirmed in co-combustion tests.

Sodium as a compound of MBM was also considered but the deactivation would be similar to potassium. Therefore, only investigation on its gas-phase concentration were carried out.

The results of the research provided the basis for the application of appropriate countermeasures either of primary nature, i.e. fuel additives or modified catalyst compositions, or secondary measures such as catalyst regeneration.

According to the composition of the consortium, both ways were pursued.

Reported by

Technical University of Denmark
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