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Cobalt-based catalysts supported on TiO 2 and ZrO 2 were studied for the oxidation of NO to NO 2 in excess oxygen. NO oxidation was studied as the first step in a two-step catalytic scheme where NO is oxidized to NO 2 and in turn NO 2 is reduced with CH 4 to N 2 under lean conditions. Catalysts were prepared by sol–gel (SG) and incipient-wetness...
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