Effects of Adding CeO2 to Ag/Al2O3 Catalyst for Ammonia Oxidation at Low Temperatures

doi:10.1016/S1872-2067(10)60220-3

Abstract

Abstract: The effects of adding CeO₂ to Ag/Al₂O₃ on the selective catalytic oxidation of ammonia to nitrogen were investigated by activity test and N₂ physisorption, X-ray diffraction, X-ray photoelectron spectroscopy, UV-Vis diffuse-reflectance spectroscopy, high resolution transmission electron microscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy of NH₃ adsorption, and O₂-pulse adsorption. Adding a suitable amount of CeO₂ improved the catalytic activity of Ag/Al₂O₃ for NH₃ oxidation at temperatures below 160 ^oC, and slightly influenced N₂ selectivity by improving the catalyst’s ability to adsorb and activate O₂ and the adsorption and activation of NH₃.

Key words: ammonia, silver, cerium, alumina oxide, supported catalyst, oxygen uptake, high resolution transmission electron microscopy, in situ diffuse reflectance infrared Fourier transform spectroscopy

ZHANG Li, LIU Fu-Dong, YU Yun-Bo, LIU Yong-Chun, ZHANG Chang-Bin, HE Hong. Effects of Adding CeO₂ to Ag/Al₂O₃ Catalyst for Ammonia Oxidation at Low Temperatures[J]. Chinese Journal of Catalysis, 2011, 32(5): 727-735.

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URL: https://www.cjcatal.com/EN/10.1016/S1872-2067(10)60220-3

https://www.cjcatal.com/EN/Y2011/V32/I5/727

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Effects of Adding CeO₂ to Ag/Al₂O₃ Catalyst for Ammonia Oxidation at Low Temperatures

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