Role of organic nitro compounds in selective reduction of NOx with ethanol over different supported silver catalysts

• Published in: Catalysis letters Vol. 51; no. 1-2; pp. 11 - 14
• Main Authors: KAMEOKA, S, CHAFIK, T, UKISU, Y, MIYADERA, T
• Format: Journal Article
• Language: English
• Published: Dordrecht Springer 01.01.1998; Springer Nature B.V
• Subjects: Aluminum oxide; Catalysis; Catalysts; Catalytic activity; Catalytic reactions; Chemistry; Ethanol; Exact sciences and technology; General and physical chemistry; Isocyanates; Nitro compounds; Nitromethane; Reduction; Silicon dioxide; Silver; Theory of reactions, general kinetics. Catalysis. Nomenclature, chemical documentation, computer chemistry; Thermal decomposition; Titanium dioxide; Nitro compound; Infrared spectroscopy; Transition metals; Silica; Supported catalyst; Titanium Oxides; Silver; Heterogeneous catalysis; Group IB metal; Nitromethane; Reduction; Adsorption; Catalyst supports; Nitrogen oxides; Catalysis; Alumina
• ISSN: 1011-372X; 1572-879X
• DOI: 10.1023/a:1019041118880

The adsorption of organic nitro compounds such as nitromethane and nitroethane on different supported silver catalysts (Ag/Al2O3, Ag/TiO2, Ag/SiO2) has been studied using infrared spectroscopy. The adsorbed NCO species formation was strongly influenced by the catalyst support and therefore clearly detected on Ag/Al2O3 and Ag/TiO2 catalysts by thermal decomposition of nitromethane and nitroethane at temperatures higher than 150°C. With the Ag/SiO2 catalyst, very little NCO formation was observed at 350°C. On the other hand, the catalyst support was found to affect the N2 formation in the selective reduction of NOx on supported silver catalysts. On the basis of these findings, the role of adsorbed nitromethane, nitroethane and isocyanate species in the selective reduction of NOx is discussed with respect to the catalyst support effect and the catalytic activity.