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The effect of platinum incorporated into Co-ferrierite catalyst on the selective catalytic reduction of NOx with CH4 was studied by means of in situ DRIFTS technique. NO adsorption on Co- and PtCo-ferrierite catalysts gave dinitrosyl and mononitrosyl species on Co2+ ions. The adsorption of NO + O2 on Co-ferrierite yielded NO2 (NO 2 δ +) species and also nitrites and nitrates. Similar species were observed on PtCo-ferrierite, although chemisorbed NO2 was much more stable since it persisted at reaction temperatures as high as 723 K. The spectra of the pre-reduced bimetallic PtCo-ferrierite catalyst exposed to the CH4 + NO + O2 reaction mixture showed bands at 2200–2100 cm-1, which were similar to results for a Pt-free sample but slightly more intense. In addition, strong bands of nitrate, almost unchanged with temperature, were observed. A very stable Co2+–NO2 intermediate species was developed upon incorporation of Pt into the base Co-ferrierite catalyst.
Catalysis Letters – Springer Journals
Published: Oct 15, 2004
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