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Title: 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.
Inventors:
;
Issue Date:
OSTI Identifier:
6884348
Assignee:
Massachusetts Institute of Technology, Cambridge, MA (United States) PTO; EDB-95-029037
Patent Number(s):
US 5384301; A
Application Number:
PPN: US 8-097367
Contract Number:
FG22-92PC92534
Resource Relation:
Patent File Date: 23 Jul 1993
Country of Publication:
United States
Language:
English
Subject:
32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION; 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

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