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Title: Catalyst for elemental sulfur recovery process

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.
Inventors:
 [1];  [2]
  1. (Winchester, MA)
  2. (Cambridge, MA)
Issue Date:
OSTI Identifier:
869719
Assignee:
Massachusetts Institute of Technology (Cambridge, MA) NETL
Patent Number(s):
US 5384301
Contract Number:
FG22-92PC92534
Research Org:
Massachusetts Institute of Technology (Cambridge, MA)
Country of Publication:
United States
Language:
English
Subject:
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; /502/423/