TY - JOUR
T1 - Properties and Detailed Adsorption of CO2by M2(dobpdc) with N, N-Dimethylethylenediamine Functionalization
AU - Zhang, Hui
AU - Zheng, Xin
AU - Yang, Li Ming
AU - Ganz, Eric
N1 - Publisher Copyright:
© 2021 American Chemical Society.
PY - 2021/2/15
Y1 - 2021/2/15
N2 - We have systematically investigated the CO2 adsorption performance and microscopic mechanism of N,N-dimethylethylenediamine (mm-2) appended M2(dobpdc) (dobpdc4- = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate; M = Mg, Sc-Zn) with density functional theory. These calculations show that the mm-2 has strong interactions with the open metal site of these structures via the first amine, and the mm-2 binding energies are generally between 123 and 172 kJ/mol. After the CO2 is attached, the ammonium carbamate molecule is created by insertion. The CO2 adsorption energies (31-81 kJ/mol) depend on the metal used (Mg; Sc-Zn). The microscopic mechanism of the CO2 adsorption process is presented at the atomic level, and the detailed potential energy surface and reaction path information are provided. The CO2 molecule and mm-2 grafted M2(dobpdc) are firstly combined via physical interactions, and then, the complex is converted into an N-coordinated zwitterion intermediate over a large energy barrier (1.02-1.51 eV). Finally, the structure is rearranged into a stable ammonium carbamate configuration through a small energy barrier (0.05-0.25 eV). We hope that this research will contribute to the understanding and production of real-world carbon capture materials.
AB - We have systematically investigated the CO2 adsorption performance and microscopic mechanism of N,N-dimethylethylenediamine (mm-2) appended M2(dobpdc) (dobpdc4- = 4,4′-dioxidobiphenyl-3,3′-dicarboxylate; M = Mg, Sc-Zn) with density functional theory. These calculations show that the mm-2 has strong interactions with the open metal site of these structures via the first amine, and the mm-2 binding energies are generally between 123 and 172 kJ/mol. After the CO2 is attached, the ammonium carbamate molecule is created by insertion. The CO2 adsorption energies (31-81 kJ/mol) depend on the metal used (Mg; Sc-Zn). The microscopic mechanism of the CO2 adsorption process is presented at the atomic level, and the detailed potential energy surface and reaction path information are provided. The CO2 molecule and mm-2 grafted M2(dobpdc) are firstly combined via physical interactions, and then, the complex is converted into an N-coordinated zwitterion intermediate over a large energy barrier (1.02-1.51 eV). Finally, the structure is rearranged into a stable ammonium carbamate configuration through a small energy barrier (0.05-0.25 eV). We hope that this research will contribute to the understanding and production of real-world carbon capture materials.
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U2 - 10.1021/acs.inorgchem.0c03527
DO - 10.1021/acs.inorgchem.0c03527
M3 - Article
C2 - 33491446
AN - SCOPUS:85100787520
SN - 0020-1669
VL - 60
SP - 2656
EP - 2662
JO - Inorganic chemistry
JF - Inorganic chemistry
IS - 4
ER -