Mechanism of the reaction of nitric oxide, ammonia, and oxygen over vanadia catalysts. 1. The role of oxygen studied by way of isotopic transients under dilute conditions
The mechanism of the selective reduction of nitric oxide with ammonia in the presence of labeled oxygen has been investigated over a series of catalysts consisting of unsupported V/sub 2/O/sub 5/, V/sub 2/O/sub 5/ on TiO/sub 2/, V/sub 2/O/sub 5/ on SiO/sub 2//Al/sub 2/O/sub 3/, and V/sub 2/O/sub 5/ on Al/sub 2/O/sub 3/. The results confirm that lattice oxygen participates in the reaction. It is shown that this participation can be explained in terms of a reduction/oxidation mechanism. Water, produced as a result of the reaction involving NO, NH/sub 3/, and O/sub 2/, is formed at two sites; the first part comes from the reaction of gaseous nitric oxide and adsorbed ammonia via an Eley-Rideal mechanism and the other comes from a surface dehydration process. The experimental findings are explained by a slightly modified and extended version of a mechanism proposed earlier.
- Research Organization:
- Arnhem Institutions of the Dutch Electricity Utilities, Netherlands
- OSTI ID:
- 5927109
- Journal Information:
- J. Phys. Chem.; (United States), Vol. 91:23
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
54 ENVIRONMENTAL SCIENCES
ALUMINIUM OXIDES
CATALYTIC EFFECTS
AMMONIA
CHEMICAL REACTIONS
NITRIC OXIDE
REDUCTION
OXYGEN
OXYGEN 18
ISOTOPE EFFECTS
ISOTOPIC EXCHANGE
SILICA
TITANIUM OXIDES
VANADIUM OXIDES
CATALYSIS
CATALYSTS
EXPERIMENTAL DATA
LABELLED COMPOUNDS
WATER
ALUMINIUM COMPOUNDS
CHALCOGENIDES
DATA
ELEMENTS
EVEN-EVEN NUCLEI
HYDRIDES
HYDROGEN COMPOUNDS
INFORMATION
ISOTOPES
LIGHT NUCLEI
MINERALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NITROGEN OXIDES
NONMETALS
NUCLEI
NUMERICAL DATA
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
SILICON COMPOUNDS
SILICON OXIDES
STABLE ISOTOPES
TITANIUM COMPOUNDS
TRANSITION ELEMENT COMPOUNDS
VANADIUM COMPOUNDS
400201* - Chemical & Physicochemical Properties
500100 - Environment
Atmospheric- Basic Studies- (-1989)
400202 - Isotope Effects
Isotope Exchange
& Isotope Separation