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Spinel powders with additions of Zn 2+ , Ni 2+ , Mn 2+ and Fe 2+ cations into Ga 2 O 3 -Al 2 O 3 were synthesized by a co-precipitation method from a mixed solution of nitrate salts in the presence of aqueous ammonia. Effective reduction of NO to N 2 using hydrocarbon in the presence of a high concentration...
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