Catalyst for elemental sulfur recovery process
A catalytic reduction process is described for the direct recovery of elemental sulfur from various SO[sub 2]-containing industrial gas streams. The catalytic process provides high activity and selectivity, as well as stability in the reaction atmosphere, for the reduction of SO[sub 2] to elemental sulfur product with carbon monoxide or other reducing gases. The reaction of sulfur dioxide and reducing gas takes place over a metal oxide composite catalyst having one of the following empirical formulas: [(FO[sub 2])[sub 1[minus]n](RO)[sub n]][sub 1[minus]k]M[sub k], [(FO[sub 2])[sub 1[minus]n](RO[sub 1.5])[sub n]][sub 1[minus]k]M[sub k], or [Ln[sub x]Zr[sub 1[minus]x]O[sub 2[minus]0.5x]][sub 1[minus]k]M[sub k] wherein FO[sub 2] is a fluorite-type oxide; RO represents an alkaline earth oxide; RO[sub 1.5] is a Group IIIB or rare earth oxide; Ln is a rare earth element having an atomic number from 57 to 65 or mixtures thereof; M is a transition metal or a mixture of transition metals; n is a number having a value from 0.0 to 0.35; k is a number having a value from 0.0 to about 0.5; and x is a number having a value from about 0.45 to about 0.55.
- DOE Contract Number:
- FG22-92PC92534
- Assignee:
- Massachusetts Institute of Technology, Cambridge, MA (United States)
- Patent Number(s):
- US 5384301; A
- Application Number:
- PPN: US 8-097367
- OSTI ID:
- 6884348
- Resource Relation:
- Patent File Date: 23 Jul 1993
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CATALYSTS
CHEMICAL COMPOSITION
GASEOUS WASTES
MATERIALS RECOVERY
SULFUR
SULFUR DIOXIDE
REDUCTION
ALKALINE EARTH METAL COMPOUNDS
FLUORINE COMPOUNDS
INDUSTRIAL WASTES
OXIDES
RARE EARTH COMPOUNDS
CHALCOGENIDES
CHEMICAL REACTIONS
ELEMENTS
HALOGEN COMPOUNDS
MANAGEMENT
NONMETALS
OXYGEN COMPOUNDS
PROCESSING
SULFUR COMPOUNDS
SULFUR OXIDES
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
320305* - Energy Conservation
Consumption
& Utilization- Industrial & Agricultural Processes- Industrial Waste Management