Question

A large amount of $N{O}_x$ emitted from the power plant and industrial units can be removed by scrubbing the flue gases with (for the commercial process):

• A. ethanol
• B. $H_{2}S{O}_4$
• C. $C{H}_{3}COOH$
• D. benzoic acid

Answer 1

The correct option is B $H_{2}S{O}_4$

Of the $N{O}_x$ absorbed by acid, typically less than 10% enters the large flow of acid circulating around the acid towers. Instead, it concentrates on the much smaller quantity of acid mist formed at the inlet to the absorber towers. There are several reactions involved, but the net result can be summarised as:

$N{O}_2+NO+2H_{2}S{O}_4⟶2HNOS{O}_4+H_{2}O$