A catalyst comprising a substrate and a catalyst coating, the catalyst coating comprising two or more layers, said layers comprising: a) a first layer provided on the substrate, said first layer comprising Pt and Pd; and b) a second layer provided on the first layer, said second layer comprising Pt; the first and second layers each further comprising: one or more particulate support materials, wherein the one or more particulate support materials comprise metal oxide support particles, said metal oxide support particles preferably comprising at least one compound selected from the group consisting of alumina, titania, titania-alumina, zirconia-alumina, baria-alumina, ceria-alumina, baria-ceria-alumina, lanthana-alumina, lanthana-zirconia-alumina, titania-zirconia and mixtures thereof; one or more oxygen storage component materials, wherein the one or more OSC materials contained in the catalyst comprise one or more compounds selected from the group consisting of zirconia, ceria, lanthana, praseodymia, neodymia, and mixtures thereof; and one or more nitrogen oxide storage materials comprising Ba, wherein Ba is contained in the catalyst in an amount ranging from 11.0 to 122 g/l (0.18 to 2.0 g/in 3), calculated as BaO, wherein the total amount of Ba comprised in the one or more nitrogen oxide storage materials contained in the catalyst ranges from 11.0 to 122 g/l (0.18 to 2.0 g/in 3) calculated as BaO, and wherein the catalyst coating comprises Pt and Pd in a Pt: Pd weight ratio comprised in the range of from 2:1 to 20:1. a) a first layer provided on the substrate, said first layer comprising Pt and Pd; and b) a second layer provided on the first layer, said second layer comprising Pt; the first and second layers each further comprising: one or more particulate support materials, wherein the one or more particulate support materials comprise metal oxide support particles, said metal oxide support particles preferably comprising at least one compound selected from the group consisting of alumina, titania, titania-alumina, zirconia-alumina, baria-alumina, ceria-alumina, baria-ceria-alumina, lanthana-alumina, lanthana-zirconia-alumina, titania-zirconia and mixtures thereof; one or more oxygen storage component materials, wherein the one or more OSC materials contained in the catalyst comprise one or more compounds selected from the group consisting of zirconia, ceria, lanthana, praseodymia, neodymia, and mixtures thereof; and one or more nitrogen oxide storage materials comprising Ba, wherein Ba is contained in the catalyst in an amount ranging from 11.0 to 122 g/l (0.18 to 2.0 g/in 3), calculated as BaO, wherein the total amount of Ba comprised in the one or more nitrogen oxide storage materials contained in the catalyst ranges from 11.0 to 122 g/l (0.18 to 2.0 g/in 3) calculated as BaO, and wherein the catalyst coating comprises Pt and Pd in a Pt: Pd weight ratio comprised in the range of from 2:1 to 20:1. one or more particulate support materials, wherein the one or more particulate support materials comprise metal oxide support particles, said metal oxide support particles preferably comprising at least one compound selected from the group consisting of alumina, titania, titania-alumina, zirconia-alumina, baria-alumina, ceria-alumina, baria-ceria-alumina, lanthana-alumina, lanthana-zirconia-alumina, titania-zirconia and mixtures thereof; one or more oxygen storage component materials, wherein the one or more OSC materials contained in the catalyst comprise one or more compounds selected from the group consisting of zirconia, ceria, lanthana, praseodymia, neodymia, and mixtures thereof; and one or more nitrogen oxide storage materials comprising Ba,