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Title: Selective low temperature NH{sub 3} oxidation to N{sub 2} on copper-based catalysts

Abstract

TPD, TPR, UV-visible spectroscopy, and high-resolution electron microscopy (HREM) have been used to characterize the state and reactivity of alumina-supported copper-based catalysts for the oxidation of ammonia to nitrogen. The results of HREM and UV spectra show that a CuAl{sub 2}O{sub 4}-like phase is more active than a CuO phase for the ammonia oxidation reaction. Both surface oxygen and copper lattice oxygen can react with NH{sub 3} to produce N{sub 2} but surface oxygen is much more active than lattice oxygen at low temperature. For copper zeolite catalysts [Cu-O-Cu]{sup 2+}-like species or small copper oxygen aggregates are the likely forms of the catalytically active centers at low temperature. The activity of CuY was increased by treating the sample with NaOH. This treatment presumably increases the amount of low temperature active centers.

Authors:
; ; ;  [1]
  1. Eindhoven Univ. of Technology (Netherlands)
Publication Date:
OSTI Identifier:
687729
Resource Type:
Journal Article
Journal Name:
Journal of Catalysis
Additional Journal Information:
Journal Volume: 186; Journal Issue: 1; Other Information: PBD: 15 Aug 1999
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; AMMONIA; OXIDATION; COPPER; CATALYTIC EFFECTS; PHASE STUDIES; AIR POLLUTION CONTROL

Citation Formats

Gang, L., Grondelle, J. van, Anderson, B.G., and Santen, R.A. van. Selective low temperature NH{sub 3} oxidation to N{sub 2} on copper-based catalysts. United States: N. p., 1999. Web. doi:10.1006/jcat.1999.2524.
Gang, L., Grondelle, J. van, Anderson, B.G., & Santen, R.A. van. Selective low temperature NH{sub 3} oxidation to N{sub 2} on copper-based catalysts. United States. doi:10.1006/jcat.1999.2524.
Gang, L., Grondelle, J. van, Anderson, B.G., and Santen, R.A. van. Sun . "Selective low temperature NH{sub 3} oxidation to N{sub 2} on copper-based catalysts". United States. doi:10.1006/jcat.1999.2524.
@article{osti_687729,
title = {Selective low temperature NH{sub 3} oxidation to N{sub 2} on copper-based catalysts},
author = {Gang, L. and Grondelle, J. van and Anderson, B.G. and Santen, R.A. van},
abstractNote = {TPD, TPR, UV-visible spectroscopy, and high-resolution electron microscopy (HREM) have been used to characterize the state and reactivity of alumina-supported copper-based catalysts for the oxidation of ammonia to nitrogen. The results of HREM and UV spectra show that a CuAl{sub 2}O{sub 4}-like phase is more active than a CuO phase for the ammonia oxidation reaction. Both surface oxygen and copper lattice oxygen can react with NH{sub 3} to produce N{sub 2} but surface oxygen is much more active than lattice oxygen at low temperature. For copper zeolite catalysts [Cu-O-Cu]{sup 2+}-like species or small copper oxygen aggregates are the likely forms of the catalytically active centers at low temperature. The activity of CuY was increased by treating the sample with NaOH. This treatment presumably increases the amount of low temperature active centers.},
doi = {10.1006/jcat.1999.2524},
journal = {Journal of Catalysis},
number = 1,
volume = 186,
place = {United States},
year = {1999},
month = {8}
}