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In situ DRIFTS study of NO reduction with CH4 over PtCo-ferrierite catalysts

In situ DRIFTS study of NO reduction with CH4 over PtCo-ferrierite catalysts 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. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Catalysis Letters Springer Journals

In situ DRIFTS study of NO reduction with CH4 over PtCo-ferrierite catalysts

Catalysis Letters , Volume 68 (4) – Oct 15, 2004

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References (16)

Publisher
Springer Journals
Copyright
Copyright © 2000 by Kluwer Academic Publishers
Subject
Chemistry; Physical Chemistry; Industrial Chemistry/Chemical Engineering; Catalysis; Pharmacy
ISSN
1011-372X
eISSN
1572-879X
DOI
10.1023/A:1019043706063
Publisher site
See Article on Publisher Site

Abstract

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.

Journal

Catalysis LettersSpringer Journals

Published: Oct 15, 2004

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