FTIR Study of the Interaction of Nitric Oxide with Fe-ZSM-51 |
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| Authors: | Lezcano M Kovalchuk V I d'Itri J L |
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| Institution: | (1) Department of Chemical and Petroleum Engineering, University of Pittsburgh, Pittsburgh, Pennsylvania 15261, USA;(2) Institute of Chemistry and Chemical Technology, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia |
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| Abstract: | The temporal behavior of infrared spectra obtained during NO adsorption on oxidized and reduced Fe-ZSM-5 at –100, 0°C, and ambient temperature is reported. The band assignment is made based on the adsorption of labeled molecules. Bands near 1838 and 1886 cm–1 (mononitrosyl Fe2+(NO) species) form quickly and remain invariant. Bands at 1922 and 1813 cm–1 (dinitrosyl Fe2+(NO)2) together with a band at 1750 cm–1 (another mononitrosyl species) gradually become more intense for hours. Purging with He at 0–500°C leads to a gradual decrease in the intensity of all the bands. Mononitrosyl bands near 1886 and 1838 cm–1 are the most stable. The features of the IR spectra of adsorbed NO suggest the presence of dispersed Fe oxide clusters in the zeolitic pore network in addition to Fe2+ ions in cationic positions of ZSM-5. |
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