Nox species removal from sulfur dioxide containing gases

Details Nox species removal from sulfur dioxide containing gases Nox species removal from sulfur dioxide containing gases

C - Chemistry, Metallurgy

01

B

C01B 17/90 (2006.01) C01B 17/76 (2006.01) C01B 17/765 (2006.01)

Patent

CA 2277678

A process involving the catalytic oxidation of sulfur dioxide to sulfur trioxide in an oxygen- and NO x -containing feed gas comprising feeding the feed gas having a NO x first concentration to a catalyst bed containing a SO2 oxidizing catalyst to provide a sulfur trioxide-containing gaseous product, the improvement comprising feeding a gaseous NO x reducing agent in admixture with the feed gas to the catalyst bed to effect reduction of the NO x and provide the gaseous product having a NO x concentration of less than the first concentration. The process provides sulfuric acid of greatly reduced nitrosyl sulfuric acid contamination.

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