Back to results
US 5,853,684 AGranted
Catalytic removal of sulfur dioxide from flue gas
AssigneeThe Hong Kong University of Science and Technology
InventorsMing Fang, Jian-Xin Ma
Life of this patent
Estimating the term…
Abstract
The present invention provides novel catalysts for the simultaneous removal of SO.sub.2 and NO.sub.x from flue gases. The catalysts may be supported or unsupported, pretreated or untreated, but allow the simultaneous reduction of SO.sub.2 to S and NO.sub.x to N.sub.2. Elemental sulfur is a useful byproduct of the process.
Claims20
A single-stage process for the simultaneous removal of SO.sub.2 and NO.sub.x from a gas stream comprising the steps of:
- (a) passing said gas stream through a catalytic reactor containing an La.sub.2 O.sub.2 S containing catalyst bed;
- (b) introducing a reducing gas stream into said catalytic reactor, wherein said reducing gas is selected from the group consisting of carbon monoxide, hydrogen, light hydrocarbons, ammonia, and mixtures thereof;
- (c) reacting sulfur dioxide and nitrogen oxide containing gas stream with said reducing gas in the presence of said La.sub.2 O.sub.2 S containing catalyst to produce elemental sulfur and nitrogen;
- (d) removing said elemental sulfur from said reaction gas stream;
- and
- (e) feeding said reaction gas stream from which sulfur has been removed to a stack.
3 more elements
Dependencies are inferred from the claim text.