Journal
JOURNAL OF MAGNETIC RESONANCE
Volume 240, Issue -, Pages 24-33Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jmr.2014.01.002
Keywords
Low-field NMR; Relaxation time distribution; Methane adsorption; Carbon dioxide; High pressure; MOF CuBTC and ZIF-8; Activated carbon
Funding
- Deutsche Forschungsgemeinschaft (DFG) via the International Research Training Group GK [1056/2, SPP 1362, STA 648/1-2]
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A low-field NMR sensor with NdFeB permanent magnets (B-o = 118 mT) and a pressure cell made of PEEK (4 cm outer diameter) were designed for H-1 relaxation time studies of adsorbed molecules at pressures of up to 300 bar. The system was used to investigate methane uptake of microporous metal-organic frameworks and nanoporous activated carbon. T-2 relaxation time distribution of pure methane and of methane under co-adsorption of carbon dioxide show that the host-guest interaction lead to a relaxation time contrasts, which may be used to distinguish between the gas phase and the different adsorbed phases of methane. Adsorption isotherms, exchange of methane between adsorbent particles and the surrounding gas phase, successive displacement of methane from adsorption sites by co-adsorption of carbon dioxide and CO2/CH4 adsorption separation factors were determined from the observed NMR relaxation time distributions. (c) 2014 Elsevier Inc. All rights reserved.
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