Explain how nitrogen monoxide (NO\text{NO}NO) is formed in industrial gas turbine combustors.
State one environmental or health hazard associated with the emission of oxides of nitrogen.
To mitigate emissions, industrial power plants utilize selective catalytic reduction (SCR) systems where ammonia, NH3\text{NH}_3NH3, reacts with nitrogen dioxide, NO2\text{NO}_2NO2, in the presence of a catalyst to form nitrogen and water.
The SCR system uses a solid metal oxide catalyst, such as vanadium(V) oxide, to facilitate this process. State the meaning of the term heterogeneous catalyst.
Carbon monoxide (CO\text{CO}CO) is another pollutant that can be released from gas turbines if the fuel-to-air ratio is incorrect. Explain why carbon monoxide is formed instead of carbon dioxide.