Hysteresis curves reveal the microscopic origin of cooperative CO2 adsorption in diamine-appended metal–organic frameworks
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; Brandeis Univ., Waltham, MA (United States)
- Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States). Molecular Foundry; Duke Univ., Durham, NC (United States)
Diamine-appended metal-organic frameworks (MOFs) of the form Mg2(dobpdc)(diamine)2 adsorb CO2 in a cooperative fashion, exhibiting an abrupt change in CO2 occupancy with pressure or temperature. This change is accompanied by hysteresis. While hysteresis is suggestive of a first-order phase transition, we show that hysteretic temperature-occupancy curves associated with this material are qualitatively unlike the curves seen in the presence of a phase transition; they are instead consistent with CO2 chain polymerization, within one-dimensional channels in the MOF, in the absence of a phase transition. Here, our simulations of a microscopic model reproduce this dynamics, providing a physical understanding of cooperative adsorption in this industrially important class of materials.
- Research Organization:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-05CH11231; SC0001015
- OSTI ID:
- 1817883
- Alternate ID(s):
- OSTI ID: 1785397
- Journal Information:
- Journal of Chemical Physics, Vol. 154, Issue 21; ISSN 0021-9606
- Publisher:
- American Institute of Physics (AIP)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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