Method of decomposing nitrogen dioxide

B - Operations – Transporting – 01 – D

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B01D 53/94 (2006.01)

Patent

CA 2522531

A method of decomposing nitrogen dioxide to nitrogen monoxide in an exhaust gas of a lean-burn internal combustion engine, such as a diesel engine, comprises adjusting the C 1 hydrocarbon : nitrogen oxides (C 1 HC:NOx) ratio of the exhaust gas to from 0.1 to 2 and contacting this exhaust gas mixture with a particulate acidic refractory oxide selected from the group consisting of zeolites, tungsten-doped titania, silica-titania, zirconia-titania, gamma- alumina, amorphous silica-alumina and mixtures of any two or more thereof and passing the effluent gas to atmosphere.

La présente invention concerne un procédé de décomposition de dioxyde d'azote en monoxyde d'azote dans un gaz d'échappement d'un moteur à combustion interne à mélange pauvre, tel qu'un moteur diesel, qui consiste à régler l'hydrocarbure C1: le rapport oxydes d'azote (C 1 HC:NO¿x?) des gaz d'échappement compris entre 0,1 et 2 et à mettre en contact ce mélange de gaz d'échappement avec un oxyde réfractaire acide particulaire sélectionné dans la groupe constitué de zéolites, anhydride titanique dopé au tungstène, silice-anhydride titanique, zircone-anhydride titanique, alumine gamma, silice-alumine amorphe et de mélanges de ceux-ci, deux à deux voire au delà et, à passer le gaz effluent dans l'atmosphère.

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