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Microporous materials for hydrogen storage

Tedds, Steven Paul (2011)
Ph.D. thesis, University of Birmingham.

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Microporous materials (with pores of less than 2 nm in diameter) have attracted considerable attention due to the variety of applications such as gas storage. Physisorption of molecular hydrogen offers several advantages over chemical absorption, namely, fast kinetics and complete reversibility. The overall aim of this work was to investigate the potential of microporous materials for hydrogen storage, with particular attention given to a relatively new class of material: Polymers of Intrinsic Microporosity (PIMs). Generally the PIMs were seen to adhere to Chahine’s rule, which predicts a linear correlation of hydrogen adsorption capacity, at 77 K, with surface area (1 wt.% per 500 m\(^2\) g\(^{-1}\)). IRMOF 1 and Cu-BTC exhibited the largest gravimetric storage capacities of 4.86 and 4.50 wt.% at 77 K and 15 bar, respectively. The largest for a microporous polymer was 3.26 wt.% at 77 K and 15 bar, for the methyl triptycene-based PIM. Two empirical equations, Sips and Tóth, were used in addition to a multi-parameter Virial type thermal equation to fit hydrogen adsorption curves over a range of temperatures (77 to 137 K), in order to calculate the enthalpy of adsorption for all materials as a function of hydrogen adsorption. The findings in this investigation suggest that there is a trade-off between gas sorption capacity and enthalpy of adsorption where dispersive van der Waals interactions dominate adsorption. It is unlikely that the optimal enthalpy of adsorption (of ca. 20 kJ mol\(^{-1}\)) will be achieved by simply reducing the pore size of the material.

Type of Work:Ph.D. thesis.
Supervisor(s):Book, David
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:T Technology (General)
TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:1765
This unpublished thesis/dissertation is copyright of the author and/or third parties. The intellectual property rights of the author or third parties in respect of this work are as defined by The Copyright Designs and Patents Act 1988 or as modified by any successor legislation. Any use made of information contained in this thesis/dissertation must be in accordance with that legislation and must be properly acknowledged. Further distribution or reproduction in any format is prohibited without the permission of the copyright holder.
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