A particulate filter, a gasoline engine emission treatment system comprising the particulate filter and a method for treating an exhaust from a gasoline engine, wherein the particulate filter comprises: a substrate, comprising a plurality of porous walls extending longitudinally to form a plurality of parallel channels extending from an inlet end to an outlet end, wherein a quantity of the channels are inlet channels that are open at the inlet end and closed at the outlet end, and a quantity of channels are outlet channels that are closed at the inlet end and open at the outlet end; an in-wall TWC coating in the inlet channels and the outlet channels, comprising a platinum group metal component, an alumina-based refractory metal oxide and an oxygen storage component, and wherein the in-wall TWC coating is free of any individual zirconium species and barium species.

An organic matter decomposition catalyst that contains a ternary composite oxide containing zirconium, manganese, and neodymium and oxidatively decomposes organic matter. Also disclosed is a honeycomb structure, a method for decomposing organic matter, and an organic matter decomposition device that use the organic matter decomposition catalyst.