Long-range catalytic hydrodechlorination of preadsorbed DDT at ambient temperature

Reductive catalytic conversion of DDT (p,p'-dichlorodiphenyltrichloroethane) was studied under ambient conditions in a hydrogen atmosphere using platinum and palladium deposited on several supports, in particular on porous alumina and silica. Almost complete hydrodechlorination and hydrogenation of DDT and its dehydrochlorination byproduct DDE (p,p' -dichlorodiphenyldichloroethene), leading to the formation of diphenylethane (with Pd) and dicyclohexylethane (with Pt), were observed at ambient temperature within minutes or hours. Rapid hydrodechlorination also takes place after depositing DDT and the metal component on separate particles and mixing them mechanically. This long-range reactivity can be explained either by a fast surface diffusion of DDT or DDE, or by hydrogen spillover. Irrespective of the mechanism, the reactivity thus bridges the barrier across solid particle interfaces. Most findings indicate the fast diffusion of target compounds as dominant mechanism for the observed long-range reactivity.

Automated summary

This study investigated the reductive catalytic conversion of DDT under ambient conditions using platinum and palladium supported on porous alumina and silica. The results showed that almost complete hydrodechlorination and hydrogenation of DDT occurred, leading to the formation of diphenylethane and dicyclohexylethane. The long-range reactivity was observed even when DDT and the metal component were deposited on separate particles and mechanically mixed. The fast diffusion of target compounds was identified as the dominant mechanism for the observed long-range reactivity.