Patent ID: 8465631

Claim:
A device for purification of a polluted gas, comprising: a honeycomb structure comprising at least one porous electron-conductive material forming walls of said structure and an electrochemical system for treating said gas, comprising: a layer of an electronically insulating and ionically conductive material D, a reduction catalyst A for reducing the polluting species of the NO x type, in contact with the electronically insulating and ionically conductive material D which forms all or part of an electrode W or which is electrically connected to an electrode W and an oxidation catalyst B for oxidizing polluting species selected from the group consisting of soot, hydrocarbons, CO, H 2 , and mixtures thereof, in contact with the electronically insulating and ionically conductive material D which forms all or part of a counterelectrode CE or which is electrically connected to a counterelectrode CE, wherein the oxidation catalyst B contacts the electron-conductive material forming the walls of the honeycomb structure, wherein said layer of electronically insulating and ionically conductive material D is between the reduction catalyst A and the oxidation catalyst B so as to electronically isolate each catalyst from the other, and wherein the honeycomb structure is capable of simultaneously reducing polluting species of the NO x type and oxidizing polluting species selected from the group consisting of soot, hydrocarbons, CO, H 2 , and mixtures thereof.