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Proceedings Paper

Formation of copper nanospecies of de-NOx catalysts based on Cu-mordenite: role of variable silica-alumina ratio and effects of adsorbed water
Author(s): Vitalii P. Petranovskii; Andrey V. Simakov; Fernando Chavez-Rivas; R. Zamorano-Ulloa; Robert Marzke; Andrey Efimov; A. Pestryakov; M.-A. Hernandez Espinosa
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Paper Abstract

Cu-mordenites catalysts are among the most active available for de-NOx at moderate temperatures. Silica-alumina molar ratio of mordenite supports strongly affects conversion efficiency for NOx. Copper mordenites' rapid deactivation by water has led us to investigate the effects of adsorbed water on framework and extra-framework ions, mainly using NMR of 27Al and 1H. Adsorbed water content has been monitored and controlled in mordenite samples via TGA, as well as by vacuum calcination. Several NMR measurements have been performed to aid in the interpretation of spectra, including variable pulse-delay spin echo and 1H-27Al TRAPDOR. A number of surface characterization techniques have been applied to both H- and Cu-mordenites. Catalytic experiments showed that the reduction of NOx to N2 and O2 by hydrocarbons reach 95-98 % depending on the catalyst composition.

Paper Details

Date Published: 2 August 2004
PDF: 9 pages
Proc. SPIE 5508, Complex Mediums V: Light and Complexity, (2 August 2004); doi: 10.1117/12.560285
Show Author Affiliations
Vitalii P. Petranovskii, Univ. Nacional Autonoma de Mexico (Mexico)
Andrey V. Simakov, Univ. Nacional Autonoma de Mexico (Mexico)
Fernando Chavez-Rivas, Instituto Politecnico Nacional (Mexico)
R. Zamorano-Ulloa, Instituto Politecnico Nacional (Mexico)
Robert Marzke, Arizona State Univ. (United States)
Andrey Efimov, St. Petersburg State Univ. (Russia)
A. Pestryakov, Tomsk State Univ. (Russia)
Fritz Haber Institute (Germany)
M.-A. Hernandez Espinosa, Benemerita Univ. Autonoma de Puebla (Mexico)

Published in SPIE Proceedings Vol. 5508:
Complex Mediums V: Light and Complexity
Martin W. McCall; Graeme Dewar, Editor(s)

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