Saint-gobain Centre De Recherches Et D'etudes Europeen

Centre National De La Recherche Scientifique

Universite Claude Bernard – Lyon1

Abdelkader Hadjar

Philippe Vernoux

Christian Gilbert Guizard

Agnes Princivalle

Ahmed Marouf

The present invention relates to an electrocatalytic system for the joint treatment of oxidizing polluting entities of the NOtype and reducing polluting entities of the hydrocarbons HC or CO type present in a gas to be purified, in particular an exhaust gas resulting from a combustion engine, said system comprising:

Electrochemical catalysis system

The invention relates to a filtration structure, for filtering a gas coming from a diesel engine, which is laden with gaseous pollutants of the nitrogen oxide NOtype and with solid particles, of the particulate filter type, said filtration structure being characterized in that it includes a catalytic system comprising at least one noble metal or transition metal suitable for reducing the NOand a support material, in which said support material comprises or is made of a zirconium oxide partially substituted with a trivalent cation Mor with a divalent cation M', said zirconium oxide being in a reduced, oxygen-sub-stoichiometric, state.

Purification structure including a catalysis system supported by a zircon in reduced state

The present invention relates to the use, for the reduction of oxidizing contaminating entities of the NOtype, in particular NO, present in a gas to be purified, of a catalytic system comprising or composed of an oxide corresponding to the molar formulation:CeOMN,

A device for the purification of a polluted gas, for example an exhaust gas from a diesel or gasoline engine, comprising, in combination: A honeycomb structure, comprising at least one porous electron-conductive material forming the walls () of said structure and an electrochemical system for treating said gas, comprising a layer () of an ionically conductive and electronically insulating material D, a reduction catalyst A () for reducing the polluting species of the NOtype and an oxidation catalyst B () for oxidizing the polluting species of the soot, hydrocarbon HC, CO or Htype, 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.

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Saint-Etienne, France

Abdelkader Hadjar