| abstract |
(57) [Abstract] [Objective] To use a catalyst for treating exhaust gas containing a high concentration of oxygen from an internal combustion engine. [Structure] These catalysts have spinel structure and ZnAl 2 It can be of the type containing a large amount of oxides having the O 4 formula, or it includes oxides having a positive or reverse spinel structure outside of ZnAl 2 O 4 . They are, in particular, by baking precursors of the constituent elements of the spinel, or by forming a solution or suspension of salts of the constituent elements of the spinel, then drying and calcining the resulting medium, or by spinel. It can be obtained by burning a mixture of a precursor of the constituent elements of and a source of carbon and nitrogen. |