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Thermal deactivation of vanadium catalysts for the oxidation of sulfur dioxide

Journal Article · · Kinet. Catal. (Engl. Transl.); (United States)
OSTI ID:5301852
; ; ;

The effects of the porous structure of the silica gel support, the composition of the gaseous medium, and the state of the active component on the high-temperature deactivation of vanadium catalysts are discussed. A significant reduction in activity in the reaction medium occurs in the absence of phase transitions in the active component and the support and correlates with a reduction in the specific surface of the catalyst; it is enhanced by the use of densely packed silica gels with a low pore volume, by an increase in the molar ratio of alkaline promoters to vanadium (M/V), and especially by an increase in the fraction of sodium promoter. Compared with the reaction mixture, deactivation in air is characterized by desulfurization, decomposition of the active component, and intense crystallization of the support.

Research Organization:
Institute of Catalysis, Novosibirsk (USSR)
OSTI ID:
5301852
Journal Information:
Kinet. Catal. (Engl. Transl.); (United States), Journal Name: Kinet. Catal. (Engl. Transl.); (United States) Vol. 28:2; ISSN KICAA
Country of Publication:
United States
Language:
English

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Related Subjects

36 MATERIALS SCIENCE
360102 -- Metals & Alloys-- Structure & Phase Studies
360202 -- Ceramics
Cermets
& Refractories-- Structure & Phase Studies
500200* -- Environment
Atmospheric-- Chemicals Monitoring & Transport-- (-1989)
54 ENVIRONMENTAL SCIENCES
ADSORBENTS
AIR POLLUTION ABATEMENT
CALCINATION
CATALYSIS
CATALYSTS
CATALYTIC EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
COHERENT SCATTERING
CRYSTAL STRUCTURE
DEACTIVATION
DECOMPOSITION
DIFFRACTION
ELEMENTS
HETEROGENEOUS CATALYSIS
INTERMEDIATE MASS NUCLEI
ISOTOPES
METALS
MICROSTRUCTURE
NMR SPECTRA
NUCLEI
ODD-EVEN NUCLEI
OXIDATION
OXIDES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
POLLUTION ABATEMENT
POROSITY
PYROLYSIS
SCATTERING
SILICA GEL
SPECTRA
STABLE ISOTOPES
SULFUR COMPOUNDS
SULFUR DIOXIDE
SULFUR OXIDES
TEMPERATURE EFFECTS
THERMAL DEGRADATION
THERMOCHEMICAL PROCESSES
TRANSITION ELEMENTS
VANADIUM
VANADIUM 51
VANADIUM ISOTOPES
X-RAY DIFFRACTION