| 摘要 |
SO<SUB>2 </SUB>and/or NO<SUB>x </SUB>are removed from gaseous CO<SUB>2 </SUB>at elevated pressure(s) in the presence of molecular oxygen and water and, when SO<SUB>2 </SUB>is to be removed, NO<SUB>x</SUB>, to convert SO<SUB>2 </SUB>to sulfuric acid and/or NO<SUB>x </SUB>to nitric acid. The sulfuric acid and/or nitric acid is/are then removed from the gaseous carbon dioxide to produce SO<SUB>2</SUB>-free, NO<SUB>x</SUB>-lean carbon dioxide gas. The invention has particular application in the removal of SO<SUB>2 </SUB>and/or NO<SUB>x </SUB>from carbon dioxide flue gas produced in an oxyfuel combustion process, for example, in a pulverized coal fired power station.
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