Steaming out captured CO2

Gas Separations Although natural gas is less carbon dioxide (CO2)–intensive than coal, capturing its emitted CO2 can be more challenging because combined-cycle natural gas combustion has a CO2 concentration that is only one-third of that of coal combustion and contains high concentrations of oxygen and water. Kim et al. report on a tetraamine-functionalized magnesium metal–organic framework that displays two-step cooperative CO2 adsorption that leads to a high CO2 capacity and adsorption enthalpy (see the Perspective by Peh and Zhao). This material could capture CO2from humid air and could be regenerated with steam, a method that is more economical than temperature or pressure swing methods. Science , this issue p. [392][1]; see also p. [372][2] [1]: /lookup/doi/10.1126/science.abb3976 [2]: /lookup/doi/10.1126/science.abc9135