Re: Na + H2O2 (50%) -> H2?
From: Jed Checketts (jedcheck_at_yahoo.com)
Date: 07/19/04
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Date: 18 Jul 2004 22:05:24 -0700
dave.harper@gmail.com (David Harper) wrote in message news:<364fd697.0407172343.7b5a87c1@posting.google.com>...
> ZHEN <zhenf@hotmail.com> wrote in message news:<40F9E740.496A99C4@hotmail.com>...
> > Hi, everyone knows:
> > Can i use 50% H2O2 to get H2 at room tempeature?
> >
> > H2O2 + H2O + Na -> H2 + NaOH + H2O2
>
> Before you do that, get all your affairs in order.
>
> Ignoring the H2O2 part, you know what happens when you put sodium in
> water, right? It's extremely exothermic and can be dangerous.
>
> Additionally, H2O2 throws off it's extra O relatively easy, so you
> might end up having the Na + H2O reaction, PLUS extra O2 given off by
> the H2O2. If you have any free H2 in the area near a hot reation with
> O2 floating around also, you'll end up with an additional reaction
> that fuels the space shuttle's main engines: (2H2 + O2) -> LOTSAHEAT +
> 2H2O
>
> If you want H2, go to a local gas supplier and rent a full 200+ ft^3
> tank for 50$.
The compressed hydrogen route is very expensive. 200 cubic feet of
hydrogen is just slightly over 1 pound of hydrogen. To spend $50.00
for this pound is silly when 11 pounds of sodium hydride (at around
$.75 per pound) would produce the same amount of hydrogen. A bottle
of compressed hydrogen is also quite bulky and has an initial cost of
more than $100.00 (not including the expensive pressure regulator) It
is also very hard to pick up. Most people just try rolling the heavy
metal bottles along the ground slowly.
Only a few pounds of sodium aluminum hydride (NaAlH4) can produce a
pound of hydrogen gas (192 cubic feet) upon contact with water.
Sodium metal can be produced from soda ash (sodium carbonate). I am
currently doing this on a small scale at Searles Lake, California.
Sodium carbonate sells for just a little over $.05 per pound.
Sodium aluminum hydride can also be shipped easily. Compressed
hydrogen is tricky to transport.
Jed Checketts
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