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A comparison of conventional heating techniques and microwave irradiation for the desorption of lithium borohydride and lithium borohydride composites

Farmer, James (2009)
M.Eng. thesis, University of Birmingham.

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Abstract

The desorption of lithium borohydride and lithium borohyride composites was examined using both conventional heating techniques and microwave irradiation. LiBH4 was milled with TiH2 in various molar ratios in an argon atmosphere using both roller and planetary mill techniques. Thermo-gravimetric analysis and differential scanning calorimetry determined the desorption characteristics of the as received and milled materials. Scanning electron microscopy was used to examine the particle size of the materials before heating. A temperature programmed desorption (TPD) rig and a custom built microwave rig were both connected to the same gas aborption system which was pressurised with hydrogen and could be operated with each system independently. A comparison in desorption characteristics was made between conventional TPD heating techniques and microwave irradiation for the as received and milled materials; mass flow controllers were able to measure the amount of hydrogen desorbed in both cases. X-ray diffraction was conducted on the samples before and after heating in the TPD rig. TiH2 was found to kinetically destabilise the desorption of LiBH4 in all techniques. Microwave induced desorption produced faster heating rates than were exhibited with conventional heating techniques using less energy, with similar amounts of hydrogen gas being desorbed in a much shorter time period.

Type of Work:M.Eng. thesis.
School/Faculty:Colleges (2008 onwards) > College of Engineering & Physical Sciences
Department:Metallurgy and Materials
Subjects:TN Mining engineering. Metallurgy
Institution:University of Birmingham
ID Code:374
This unpublished thesis/dissertation is copyright of the author and/or third parties.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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