PURIFICATION STRUCTURE INCORPORATING A BIASED ELECTROCHEMICAL CATALYST SYSTEM

摘要

A device for the purification of a polluted gas, for example an exhaust gas from a diesel or petrol engine, comprising, in combination: a honeycomb structure, comprising at least one porous electron-conductive material forming the walls (1) of said structure and an electrochemical system for treating said gas, comprising a layer (7) of an ionically conductive and electronically insulating material D, a reduction catalyst A (9) for reducing the polluting species of the NOx type, an oxidation catalyst B (4) for oxidizing the polluting species of the soot, hydrocarbon HC, CO or H2 type, said electrochemical system being configured in the form of an electrode W and a counterelectrode CE, and means for applying a voltage or a current between said electrode W and said counterelectrode CE.