Particulate Cu on ordered Al[sub 2]O[sub 3]: Reactions with nitric oxide and carbon monoxide

Journal Article · Thu Sep 29 04:00:00 EDT 1994 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100090a023· OSTI ID:6922742

Wu, M C; Goodman, D W ^[1]

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1. Texas A M Univ., College Station, TX (United States)

The growth of small Cu particles, prepared by vacuum vapor deposition, on Al[sub 2]O[sub 3] films on Mo(100) has been studied in the 80-800 K substrate temperature range with Auger electron spectroscopy (AES) and temperature-programmed desorption (TPD). A model based on Auger measurements has been utilized to examine the number density and the average size of the Cu particles on Al[sub 2]O[sub 3]. Nitric oxide decomposition on the Cu particles has been further investigated using TPD and high-resolution electron energy lost spectroscopy (HREELS). TPD and HREELS data clearly show that a fraction of the NO molecules reaction with the Cu particles to produce gaseous N[sub 2] and N[sub 2]O in the 90-250 K temperature range. The formation of N[sub 2] at 770 K is also evident and is due to the recombination of adsorbed N atoms from NO dissociation. The effects of retained oxygen, adsorption temperature, and particle size on the production of high-temperature N[sub 2] have been examined. The reaction between nitric oxide and carbon monoxide has also been studied. The results show that, besides the N[sub 2] and N[sub 2]O products arising from NO decomposition, a small quantity of CO is produced by the reaction between adsorbed CO and adsorbed oxygen. 40 refs., 13 figs.

• OSTI ID: 6922742
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 98:39; ISSN JPCHAX; ISSN 0022-3654
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
54 ENVIRONMENTAL SCIENCES
540120 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (1990-)
ADSORPTION
ALUMINIUM COMPOUNDS
ALUMINIUM OXIDES
AUGER ELECTRON SPECTROSCOPY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON MONOXIDE
CARBON OXIDES
CATALYST SUPPORTS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COPPER
DECOMPOSITION
DEPOSITION
DESORPTION
ELECTRON SPECTROSCOPY
ELEMENTS
ENERGY-LOSS SPECTROSCOPY
EVAPORATION
MATHEMATICAL MODELS
METALS
MOLYBDENUM
NITRIC OXIDE
NITROGEN
NITROGEN COMPOUNDS
NITROGEN OXIDES
NITROUS OXIDE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
PARTICLE SIZE
PHASE TRANSFORMATIONS
PHYSICAL VAPOR DEPOSITION
SIZE
SORPTION
SPECTROSCOPY
SURFACE COATING
SURFACE PROPERTIES
TEMPERATURE RANGE
TEMPERATURE RANGE 0013-0065 K
TEMPERATURE RANGE 0065-0273 K
TEMPERATURE RANGE 0273-0400 K
TRANSITION ELEMENTS
VACUUM EVAPORATION