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Hydrogen sorption in palladium doped microporous materials

Hamilton, Philip (2009)
M.Res. thesis, University of Birmingham.

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Abstract

This research investigated “hydrogen spillover” which has been suggested to improve the hydrogen uptake of bridged and chemically doped porous materials at room temperatures. XRD, Temperature Programmed Desorption and hydrogen sorption measurements were used to characterise the as-received and palladium doped porous materials. The hydrogen uptakes of as-received Maxsorb (activated carbon), Black Pearls (carbon furnace black) and MOF-5 (metal organic framework) were all very low (<0.16 wt.%) at room temperature and 16 bar. Bridging the Black Pearls and Maxsorb carbon samples with 5 wt.% Pd/C resulted in fractionally higher hydrogen uptakes (0.01 wt.%). These results bore a closer resemblance to a physical mixture of Pd and carbon which suggested that the bridges had not been formed and spillover was not occurring. A higher wt.% Pd chemically doped carbon showed an initial rapid hydrogen uptake (0.03 wt.% at <1 bar) followed by a shallower near linear uptake above this pressure. The hydrogen uptake seemed more consistent with palladium and carbon sorbing independently, rather than hydrogen spilling over from palladium to carbon giving enhanced uptake. However, good contact between Pd and carbon must be established and the result must be replicated to confirm its validity in the face of much contrary literature.

Type of Work:M.Res. thesis.
Supervisor(s):Book, David
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:School of Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:430
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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