Alkyl-chain-grafted 13X zeolite for steady CO

13X zeolite shows potential for CO2 capture, but its performance is diminished by the steam present in real-world flue gas. To overcome this limitation, a facile and efficient approach is to graft straight-chain alkyl groups to the 13X structure. Adsorbents with anchored alkyl groups exhibit both high CO2 uptake and excellent resistance to humidity.