Process for removing nitrogen oxides and sulfur oxides from gaseous stream
 A process for removing NO.sub.x and/or SO.sub.x from a gaseous stream by oxidation with a fine flocculent acidic catalyst slurry which is regenerable during the process, in particular by pH adjustment in the absence of added heat. The catalyst slurry comprises MnO.sub.2, Mn.sub.2 O.sub.3, and Mn.sub.3 O.sub.4 having pH in the range from about 0.5 to about 6.5 and is prepared by aerating a divalent manganous salt in an aqueous solution having a pH in the range from about 8.0 to about 13.5. 
Shell Oil Company
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C01D C01F B01D C01D
inventional inventional inventional inventional
Charles C. Chaoliang
Chou Yao