Alumina-supported Cu-Ag catalysts for ammonia oxidation to nitrogen at low temperature

L. Gang, B.G. Anderson, J. Grondelle, van, R.A. Santen, van, W.J.H. Gennip, van, J.W. Niemantsverdriet, P.J. Kooyman, A. Knoester, H.H. Brongersma

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Abstract

The addition of copper to alumina-supported silver catalysts, by co-incipient wetness impregnation, increased the selectivity to nitrogen during the catalytic oxidation of ammonia at 250°C without significant decrease in activity relative to that of Ag/alumina alone. An increase in selectivity from 80 to circa 95% was observed at 100% ammonia conversion at the optimum Ag/Cu weight ratio (between 1 : 1 and 3 : 1). No increase in activity was observed for mechanical mixtures of Cu/alumina and Ag/alumina catalysts. Based on transmission electron microscopy (TEM), energy-dispersive X-ray spectroscopy (EDX), low-energy ion-scattering spectroscopy, X-ray photoelectron spectroscopy, and Auger analysis, the catalysts consisted of monolayers of copper oxide on alumina upon which silver particles sat. TEM images and EDX analysis showed that silver particles, with a very large size distribution, existed on all catalysts. EDX also revealed the presence of very small (
Original languageEnglish
Pages (from-to)60-70
Number of pages11
JournalJournal of Catalysis
Volume206
Issue number1
DOIs
Publication statusPublished - 2002

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    Gang, L., Anderson, B. G., Grondelle, van, J., Santen, van, R. A., Gennip, van, W. J. H., Niemantsverdriet, J. W., Kooyman, P. J., Knoester, A., & Brongersma, H. H. (2002). Alumina-supported Cu-Ag catalysts for ammonia oxidation to nitrogen at low temperature. Journal of Catalysis, 206(1), 60-70. https://doi.org/10.1006/jcat.2001.3470