CO2/CH4, CH4/H2 and CO2/CH4/H2 Separations at High Pressures Using Mg2(dobdc)
- Univ. of California, Berkeley, CA (United States)
High-pressure separations of binary and ternary mixtures of CO₂, CH₄, and H₂ are relevant to carbon dioxide capture as well as hydrogen and natural gas purification. Metal–organic frameworks represent a class of porous materials that could be used to accomplish these separations, and Mg₂(dobdc) (dobdc{sup 4-} = 1,4-dioxido-2,5-benzenedicarboxylate), also sometimes referred to as Mg–MOF-74 or CPO-27–Mg, is an especially lightweight metal–organic framework with a high concentration of coordinatively-unsaturated metal sites decorating its interior surfaces. High pressure CH₄ adsorption isotherms presented here, together with CO₂ and H₂ adsorption behavior, are analyzed using the Ideal Adsorbed Solution Theory to model CO₂/CH₄, CH₄/H₂, and CO₂/CH₄/H₂ mixture separations using Mg₂(dobdc). The selectivities, working capacities and breakthrough performances for these three mixtures are reported, and Mg₂(dobdc) is shown to outperform zeolite 13X in each scenario.
- Research Organization:
- Energy Frontier Research Centers (EFRC); Center for Gas Separations Relevant to Clean Energy Technologies (CGS)
- Sponsoring Organization:
- USDOE SC Office of Basic Energy Sciences (SC-22)
- DOE Contract Number:
- SC0001015
- OSTI ID:
- 1065799
- Journal Information:
- Microporous and Mesoporous Materials, Journal Name: Microporous and Mesoporous Materials Vol. 151; ISSN 1387-1811
- Publisher:
- Elsevier
- Country of Publication:
- United States
- Language:
- English
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