Nox-trap composition

摘要

A NOx-trap composition comprises a platinum group metal (PGM), at least one NOx storage component and a first support for supporting the PGM and the at least one Nox storage component, which at least one NOx storage component comprises at least one of an alkali metal and a rare earth metal or a mixture of any two or more thereof characterised in that the PGM consists of rhodium.