Several methods are used to control SOx emissions, often involving catalytic and non-catalytic techniques. Some of the most common methods include:
1. Flue Gas Desulfurization (FGD): This process involves the use of a slurry of alkaline substances, such as limestone or lime, to react with SOx in the flue gas, converting it into gypsum (calcium sulfate), which can be removed.
2. Selective Catalytic Reduction (SCR): This method uses catalysts to reduce SOx into elemental sulfur or sulfuric acid. Catalysts like vanadium pentoxide or titanium dioxide are often used in this process.
3. Wet Scrubbing: This technique involves the use of a liquid absorbent to remove SOx from exhaust gases. The absorbent can be a solution of sodium hydroxide or ammonia.
