Question

A car burning lead-free fuel has a catalytic converter fitted to its exhaust. On analysis its exhaust
gases are shown to contain small quantities of nitrogen oxides.

Which modifications would result in lower exhaust concentrations of nitrogen oxides?
1 an increase in the surface area of the catalyst in the converter
2 an increase in the rate of flow of the exhaust gases through the converter
3 a much higher temperature of combustion in the engine

Answer 1

1) nitrogen oxide would be reduced to nitrogen and is released from the exhaust so 1 is correct

Answer 2

if we increased the rate of flow of the exhaust gases through the converter would cause more nitrogen oxide to enter and carbon monoxide and would higher its concentrate so 2 is incorrect