Mechanism of the catalytic oxidation of hydrogen sulfide. II. Kinetics and mechanism of hydrogen sulfide oxidation catalyzed by sulfur. [20 to 250/sup 0/C]
The kinetics of the catalytic oxidation of hydrogen sulfide by molecular oxygen have been studied in the temperature range 20-250/sup 0/C. The primary reaction product is sulfur which may undergo further oxidation to SO/sub 2/ at temperatures above 200/sup 0/C. From the kinetics of this autocatalytic reaction an oxidation-reduction mechanism was derived. The two rate influencing steps are the chemisorption of oxygen and the reaction between dissociatively chemisorbed H/sub 2/S and chemisorbed oxygen. The high activation energy for the formation of SO/sub 2/ (120 kJ mol/sup -1/) explains the high selectivity towards sulfur, although SO/sub 2/ is thermodynamically the most favored product. At temperatures above 300/sup 0/C, where the formation of SO/sub 2/ occurs readily, the SO/sub 2/ may be an intermediate in the reaction of H/sub 2/S with O/sub 2/ leading to S and H/sub 2/O.
- Research Organization:
- Twente Univ. of Tech., Enschede, Netherlands
- OSTI ID:
- 7315065
- Journal Information:
- J. Catal.; (United States), Vol. 42:1
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
HYDROGEN SULFIDES
OXIDATION
SULFUR
CATALYTIC EFFECTS
HIGH TEMPERATURE
MEDIUM TEMPERATURE
OXYGEN
REACTION KINETICS
SULFUR DIOXIDE
TEMPERATURE EFFECTS
CHALCOGENIDES
CHEMICAL REACTIONS
CRYOGENIC FLUIDS
ELEMENTS
FLUIDS
HYDROGEN COMPOUNDS
KINETICS
NONMETALS
OXIDES
OXYGEN COMPOUNDS
SULFIDES
SULFUR COMPOUNDS
SULFUR OXIDES
400201* - Chemical & Physicochemical Properties