Microscopic Theory of Hysteretic Hydrogen Adsorption in Nanoporous Materials

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Understanding gas adsorption confined in nanoscale pores is a fundamental issue with broad applications in catalysis and gas storage. Recently, hysteretic H(2) adsorption was observed in several nanoporous metal-organic frameworks (MOFs). Here, using first-principles calculations and simulated adsorption/desorption isotherms. we present a microscopic theory of the enhanced adsorption hysteresis of H(2) molecules using the MOF Co(1,4-benzenedipyrazolate) [Co(BDP)] as a model system. Using activated H(2) diffusion along the small-pore channels as a dominant equilibration process, we demonstrate that the system shows hysteretic H(2) adsorption under changes of external pressure. For a small increase of temperature, the pressure width of the hysteresis, as well as the adsorption/desorption pressure, dramatically increases. The sensitivity of gas adsorption to temperature changes is explained by the simple thermodynamics of the gas reservoir. Detailed analysis of transient adsorption dynamics reveals that the hysteretic H(2) adsorption is an intrinsic adsorption characteristic in the diffusion-controlled small-pore systems.
Publisher
AMER CHEMICAL SOC
Issue Date
2010-02
Language
English
Article Type
Article
Keywords

METAL-ORGANIC FRAMEWORKS; STORAGE

Citation

JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, v.132, no.5, pp.1510 - 1510

ISSN
0002-7863
DOI
10.1021/ja9092133
URI
http://hdl.handle.net/10203/97834
Appears in Collection
NT-Journal Papers(저널논문)
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