L13-storage2 - Hydrogen Storage and Production 1 8/19/2005...

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Unformatted text preview: Hydrogen Storage and Production 1 8/19/2005 TOPIC TOPIC TOPIC TOPIC: H y d r o g e n S t o r a g e a n d T r a n s p o r t LECTURE LECTURE LECTURE LECTURE # # # # 13 13 13 13 Hydrogen Storage and Production 2 8/19/2005 Hydrogen Storage Carbon Two most common forms of carbon s Diamond b Atom is fully co-ordinate symmetrical in space in all three dimensions s Graphite b Build up in a two dimensional hexagonal sheet of carbon atoms, with long distances between each sheet Hydrogen Storage and Production 3 8/19/2005 Hydrogen Storage Carbon Other forms of carbon s Fullerenes and nanaotubes s Nanofibres s Activated carbon s Carbon fibres Hydrogen Storage and Production 4 8/19/2005 Hydrogen Storage s Some of the properties of Carbon are b Very high strength b Low weight b High thermal stability b Good hydrogen adsorbent b Gases absorb in the pores so density is higher b At high pressures capillary condensation of liquid hydrogen takes place we above the standard condensation temperature (Chen 1999 & Lie 1999) b Applicable for mobile and vehicle applications Hydrogen Storage and Production 5 8/19/2005 Hydrogen Storage Activated Carbon s Absorbs significant quantity of hydrogen at low temperature and high pressure s The method of adsorption of hydrogen and carbon relies on affinity of both the atoms s Storage density of 35g of H2 / l of carbon at 77k and 55 bar have been achieved s Fueling property it takes 20 min to store 4% by system weight; its much faster when compared to other fuels and it had been demonstrated when pre-cooled hydrogen is re-circulated with perfect insulation s They are complex and high initial cost, but energy density is improved s By improving the characteristics of adsorbent, it can be improved further Hydrogen Storage and Production 6 8/19/2005 Hydrogen Storage Activated Carbon Nanotubes s Elongated micropores of molecular dimensions s Depending on the method of preparation they can be b Insulators b Semiconductors b Conductors Hydrogen Storage and Production...
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L13-storage2 - Hydrogen Storage and Production 1 8/19/2005...

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