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

doi:10.1006/jcat.2001.3470

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

Research output: Contribution to journal › Article › Academic › peer-review

103 Citations (Scopus)

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 language	English
Pages (from-to)	60-70
Number of pages	11
Journal	Journal of Catalysis
Volume	206
Issue number	1
DOIs	https://doi.org/10.1006/jcat.2001.3470
Publication status	Published - 2002

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title = "Alumina-supported Cu-Ag catalysts for ammonia oxidation to nitrogen at low temperature",

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 (",

author = "L. Gang and B.G. Anderson and \{Grondelle, van\}, J. and \{Santen, van\}, R.A. and \{Gennip, van\}, W.J.H. and J.W. Niemantsverdriet and P.J. Kooyman and A. Knoester and H.H. Brongersma",

year = "2002",

doi = "10.1006/jcat.2001.3470",

language = "English",

volume = "206",

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publisher = "Academic Press Inc.",

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T1 - Alumina-supported Cu-Ag catalysts for ammonia oxidation to nitrogen at low temperature

AU - Gang, L.

AU - Anderson, B.G.

AU - Grondelle, van, J.

AU - Santen, van, R.A.

AU - Gennip, van, W.J.H.

AU - Niemantsverdriet, J.W.

AU - Kooyman, P.J.

AU - Knoester, A.

AU - Brongersma, H.H.

PY - 2002

Y1 - 2002

N2 - 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 (

AB - 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 (

U2 - 10.1006/jcat.2001.3470

DO - 10.1006/jcat.2001.3470

M3 - Article

SN - 0021-9517

VL - 206

SP - 60

EP - 70

JO - Journal of Catalysis

JF - Journal of Catalysis

IS - 1

ER -

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

Abstract

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