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- W67418652 abstract "The catalytic activity of Pd-H-ZSM-5 catalysts containing 0.18 to 1.56 wt.- % Pd in the reduction of NO by CH 4 in the presence of excess O 2 (lean mixture) was measured and the adsorption of NO was studied by FTIR. For all samples, NO adsorption results in the formation of a Pd + mononitrosyl complex (v NO = 1881 cm -1 ) and adsorbed NO 2 (v NO = 2136 cm -1 ) interacting with both Pd ions and acidic hydroxyl groups of the zeolite. The formation of NO 2 arises from the reduction of isolated Pd 2+ cations and/or Pd 2+ hydroxyl complexes bonded to the oxygen atoms of the zeolite framework into Pd + complexes still anchored to the framework. The amount of Pd complexes increases linearly with Pd content up to 0.6 wt.-% Pd. The catalytic activity measurements indicate that two competitive reactions occur: the reduction of NO by CH 4 and the combustion of CH 4 by O 2 . Samples containing less than 0.5 wt.-% Pd exhibit high selectivity for NO reduction and the conversion of NO increases with the amount of Pd nitrosyl complexes detected by IR. For samples with higher Pd contents, the combustion of CH 4 is favored. The coexistence of isolated Pd complexes active for the SCR reaction and PdO aggregates active for the CH 4 combustion is suggested to explain the catalytic properties." @default.
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- W67418652 date "1998-01-01" @default.
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- W67418652 title "Catalytic Properties of Palladium Exchanged ZSM-5 Catalysts in the Reduction of Nitrogen Monoxide by Methane in the Presence of Oxygen: Nature of the Active sites" @default.
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- W67418652 doi "https://doi.org/10.1016/s0167-2991(98)80884-7" @default.
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