XAS Studies on the Interaction of with PtY and PdY Zeolites

Summary The primary step of chlorobenzene combustion in air over PtY and PdY zeolites turns out to be the reduction of the noble metal component to zero oxidation number followed by clustering. During reaction the formation of an intermediate Pt-Cl complex can be proven but chlorine seems not to be responsible for deactivation by irreversible blocking of the active centres. Comparative studies with bromobenzene reveal different behaviour of PdY and PtY concerning the uptake of bromine during reaction, providing an explanation for the far longer reaching activity of the PtY catalyst.