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

Journal Article · Sun Aug 15 04:00:00 EDT 1999 · Journal of Catalysis

DOI:https://doi.org/10.1006/jcat.1999.2524· OSTI ID:687729

Gang, L; Grondelle, J van; Anderson, B G; Santen, R.A. van ^[1]

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1. Eindhoven Univ. of Technology (Netherlands)

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.

• OSTI ID: 687729
• Journal Information: Journal of Catalysis, Journal Name: Journal of Catalysis Journal Issue: 1 Vol. 186; ISSN 0021-9517; ISSN JCTLA5
• Country of Publication: United States
• Language: English

Related Subjects

54 ENVIRONMENTAL SCIENCES
AIR POLLUTION CONTROL
AMMONIA
CATALYTIC EFFECTS
COPPER
OXIDATION
PHASE STUDIES