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Title: Catalyst for elemental sulfur recovery process

Patent ·
OSTI ID:869719
 [1];  [2]
  1. Winchester, MA
  2. Cambridge, MA
+ Show Author Affiliations

A catalytic reduction process 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: [(OF.sub.2).sub.1-n (RO.sub.1)n].sub.1-k M.sub.k, [(FO.sub.2).sub.1-n (RO.sub.1.5).sub.n ].sub.1-k M.sub.k, or [Ln.sub.x Zr.sub.1-x O.sub.2-0.5x ].sub.1-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.

Research Organization:
Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
DOE Contract Number:
FG22-92PC92534
Assignee:
Massachusetts Institute of Technology (Cambridge, MA)
Patent Number(s):
US 5384301
OSTI ID:
869719
Country of Publication:
United States
Language:
English

References (8)

Catalytic Reduction of Sulfur Dioxide with Carbon Monoxide on Cobalt Oxides journal December 1975
Catalytic Reduction of Sulfur Dioxide on Iron-Alumina Bifunctional Catalysts journal June 1971
Flue gas desulphurisation: Catalytic removal of sulphur dioxide by carbon monoxide on sulphided La1−xSrxCoO3 journal July 1988
Preparation of Highly Dispersed Mixed Oxides and Oxide Solid Solutions by Pyrolysis of Amorphous Organic Precursors journal January 1970
The Allied Chemical Sulfur Dioxide Reduction Process for Metallurgical Emissions book April 1975
Removal of Sulfur Dioxide from Stack Gases by Catalytic Reduction to Elemental Sulfur with Carbon Monoxide journal January 1973
Preparation of Cerium Dioxide Powders for Catalyst Supports journal February 1988
Sulfuric Acid Plants for Copper Converter Gas book April 1975

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Related Subjects

catalyst
elemental
sulfur
recovery
process
catalytic
reduction
direct
various
-containing
industrial
gas
streams
provides
activity
selectivity
stability
reaction
atmosphere
product
carbon
monoxide
reducing
gases
dioxide
takes
metal
oxide
composite
following
empirical
formulas
1-n
1-k
ln
zr
1-x
2-0
5x
fluorite-type
represents
alkaline
earth
iiib
rare
element
atomic
57
65
mixtures
transition
mixture
metals
value
35
45
55
oxide composite
catalytic process
reducing gas
process provides
earth oxide
elemental sulfur
transition metals
carbon monoxide
metal oxide
gas stream
alkaline earth
transition metal
rare earth
gas streams
sulfur dioxide
recovery process
reduction process
catalytic reduction
earth element
reducing gases
composite catalyst
sulfur recovery
industrial gas
direct recovery
sulfur product
-containing industrial
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