Table 3 Energy requirements for the MgO looping process.

From: Ambient weathering of magnesium oxide for CO2 removal from air

Unit operationEnergy requirementsEnergy type
Lower boundUpper bound
Air separation unit and condenser7 [MJ tCO2−1]300300Electricity
Oxy-fired calciner [MJ tCO2−1]58907970Natural gas
Transportation [MJ tCO2−1]89Electricity
Stirring equipment [gallons tCO2−1]0.290.31Gasoline
Recollection equipment [gallons tCO2−1]0.00510.0054Gasoline