Catalytic decomposition of nitric oxide in the presence of alkaline earth oxides

Journal Article · Sat Jan 01 04:00:00 EST 1977 · J. Electrochem. Soc.; (United States)

DOI:https://doi.org/10.1149/1.2133244· OSTI ID:7315045

Meubus, P

The alkaline earth oxides of barium, strontium, and calcium have been studied as catalysts for the decomposition of nitric oxide. The low work function characterizing these oxides is liable to favor an electron donor catalytic process which decomposes the nitric oxide molecule. The latter was used diluted in helium and the concentration was varied between 0.5 and 2.5%. Experiments were carried out at 650, 750, and 850/sup 0/C. After passage over the catalyst, nitric and nitrous oxides were found in the gaseous phase, as well as nitrogen and oxygen. It was found that the decomposition reaction rates of nitric and nitrous oxides are mutually independent. Reaction rate constants were calculated, showing that constants related to nitric oxide were at least one order of magnitude higher than those related to nitrous oxide thus explaining the independent behavior. The total conversion for nitric oxide was highest for barium oxide, attaining 80% at 850/sup 0/C, followed by strontium and calcium oxides. Increasing efficiencies coincide with a decrease in work function. Within the limits of nitric oxide used, up to 3% oxygen do not show any inhibitive effect on nitric oxide decomposition. (17 fig.)

• Research Organization: Univ. of Quebec
• OSTI ID: 7315045
• Journal Information: J. Electrochem. Soc.; (United States), Journal Name: J. Electrochem. Soc.; (United States) Vol. 124:1; ISSN JESOA
• Country of Publication: United States
• Language: English

Related Subjects

33 ADVANCED PROPULSION SYSTEMS
330701 -- Emission Control-- Nitrogen Oxides
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400201* -- Chemical & Physicochemical Properties
500200 -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ALKALINE EARTH METAL COMPOUNDS
BARIUM COMPOUNDS
BARIUM OXIDES
CALCIUM COMPOUNDS
CALCIUM OXIDES
CATALYSIS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
DECOMPOSITION
ELEMENTS
FLUIDS
KINETICS
NITRIC OXIDE
NITROGEN COMPOUNDS
NITROGEN OXIDES
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
REACTION KINETICS
STRONTIUM COMPOUNDS
STRONTIUM OXIDES
TEMPERATURE DEPENDENCE