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AssigneeToyota Jidosha Kabushiki Kaisha
InventorsKohei Yoshida, Kotaro Hayashi, Shinya Hirota, Takamitsu Asanuma, Hiromasa Nishioka, Hiroshi Otsuki
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An SOX trap catalyst (11) in which at least one of an alkali metal and alkali earth metal is carried diffused is arranged in an exhaust passage of an internal combustion engine. By holding the temperature of the SOX trap catalyst (11) during engine operation at the temperature where a nitrate of the at least one of the alkali metal and alkali earth metal becomes the melted state, a nitrate movement and coagulation action where the nitrate in the SOX trap catalyst (11) moves to and coagulates at the surface of the SOX trap catalyst (11) is promoted. Due to this nitrate movement and coagulation action, SOX is removed while restoring the SOX trap rate.
An exhaust purification device of an internal combustion engine arranging an SOX trap catalyst able to trap SOX contained in exhaust gas inside an engine exhaust passage, wherein the SOX trap catalyst carries at least one of an alkali metal and alkali earth metal diffused inside it, a temperature of the SOX trap catalyst is held at a temperature where a nitrate of the at least one of alkali metal and alkali earth metal becomes a melted state during engine operation, whereby a nitrate movement and coagulation action where the nitrate in the SOX trap catalyst moves to and coagulates at the SOX trap catalyst surface is promoted, and the nitrate movement and coagulation action is used to restore the SOX trap rate and remove the SOX.
An exhaust purification method for removing SOX contained in exhaust gas by an SOX trap catalyst arranged in an engine exhaust passage, comprising carrying at least one of an alkali metal and alkali earth metal diffused in the SOX trap catalyst, holding a temperature of the SOX trap catalyst at a temperature where a nitrate of at least one of the alkali metal and alkali earth metal becomes a melted state during engine operation so as to promote a nitrate movement and coagulation action where the nitrate in the SOX trap catalyst moves to and coagulates at the SOX trap catalyst surface, and using the nitrate movement and coagulation action to restore the SOX trap rate and remove the SOX.
Dependencies are inferred from the claim text.