COMPOSITION FOR USE AS TRAP NOx AND USE IN THE TREATMENT OF EXHAUST GASES

The invention relates to a composition usable as NOx trap, characterized in that it comprises: - a first component comprising one or more oxides of an element belonging to Groups VIA, VIIA, VIII and IB of the Periodic Table, on a first support, and- a second component comprising one or more compounds selected from nitrates and oxides of an element belonging to the groups IA and IIA of the periodic table, hydrotalcites and hydroxyapatite, on a second support.