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Which of the following sources of energy on combustion produces maximum carbon dioxide per unit of energy output or heat content?

Which of the following sources of energy on combustion produces maximum carbon dioxide per unit of energy output or heat content? Correct Answer Coal (sub-bituminous)

Carbon dioxide produced by different fuels

  • Different fuels emit different amounts of carbon dioxide (CO2) in relation to the energy they produce when burned.
  • The amount of CO2 produced when a fuel is burned is a function of the carbon content of the fuel.
  • The heat content, or the amount of energy produced when a fuel is burned, is mainly determined by the carbon (C) and hydrogen (H) content of the fuel.
  • Heat is produced when C and H combine with oxygen (O) during combustion.
  • Natural gas is primarily methane (CH4), which has a higher energy content relative to other fuels, and thus, it has a relatively lower CO2-to-energy content. 
  • Water and various elements, such as sulfur and noncombustible elements in some fuels, reduce their heating values and increase their CO2-to-heat contents.
  • Coal generates the most CO2 emissions of any fossil fuel and yet remains the world's dominant energy source.

Pounds of CO2 emitted per million British thermal units (Btu) of energy for various fuels

Fuel CO2 emitted per Btu
Coal (anthracite) 228.6
Coal (bituminous) 205.7
Coal (lignite) 215.4
Coal (sub-bituminous) 214.3
Diesel fuel and heating oil 161.3
Gasoline (without ethanol) 157.2
Propane 139.0
Natural gas 117.0

 

Fossil fuels are the main sources of carbon dioxide in the environment. The maximum amount of CO2 is produced from the burning of coal and the least amount of CO2 is produced from the burning of natural gas.

Hence, option (1) is correct

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