Re: Hydrogen
jedcheck_at_yahoo.com
Date: 12/06/04
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Date: 6 Dec 2004 15:34:34 -0800
O18-C-O16 wrote:
> jedcheck@yahoo.com (Jed Checketts) wrote in message
news:<e98177f2.0411021717.579413a0@posting.google.com>...
> > "Michael" <PostNoSpam@RecoveryByDiscovery.com> wrote in message
news:<2upo03F2e8v5oU1@uni-berlin.de>...
> > > http://mb-soft.com/public2/hydrogen.html
> >
> > A good alternative to compressed hydrogen is to use hydrides.
> >
> > Sodium hydride, for instance produces 1300 times its own volume of
> > hydrogen upon contact with water. Compressed hydrogen is not
anywhere
> > even near close to this density by volume.
> >
> > Sodium aluminum hydride stores even more hydrogen by volume than
> > sodium hydride does.
> >
> > Lithium aluminum hydride stores an incredible amount of hydrogen by
> > volume when the LiAlH4 is contacted with water. In fact, it is
more
> > energy dense by mass than gasoline.
> >
> > Sodium aluminum hydride will eventually become the ubiquitous
method
> > by which hydrogen is shipped, stored, and utilized. (provided that
> > the reasons for energy carrier choice are science-based).
> >
> > The chemistry for obtaining hydrogen upon demand via NaAlH4:
> >
> > NaAlH4 + 2 H2O --> NaAlO2 + 4 H2
> >
> >
> > (note that you get lots of hydrogen for the NaAlH4 which is used).
> >
> > NaAlO2 is nice to work with and can be recycled back into NaAlH4
using
> > a variety of clean energy sources including solar energy.
> >
> > It is possible to produce NaAlH4 in your backyard from NaAlO2 using
> > only concentrated solar energy to get the job done. NaAlH4 --
hydrogen
> > without pressure.
> >
> > Jed Checketts
> > Trona, CA
> > 760-372-4468
>
> Have some questions
>
> 1) At what temperature and pressure does consentrared solar energy
> bake NaAlO2 and 4H2 into NaAlH4 ?
It takes about 870 C.
>
> 2) When mixed with water, I assume that NaAlH4 will release the solar
> energy stored in the process above. Is it possible to slow down or
> stop the reaction by increasing pressure and temperature, like in a
> high pressure boiler connected to a steam turbine ?
The rate of energy production can be easily controlled by controlling
the amount of hydrogen produced by the NaAlH4 hydrolysis and
consequently the hydrogen available to either a combustion engine or a
fuel cell.
Jed Checketts
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