2 Al2O3(c,alumina,alpha) -> 3 O2(g) + 4 Al(c) - 3351.4 kJ/mol (endothermic)
Reverse reaction spontaneous at 25°C. Equilibrium at about 5073°C.
I copy-pasted the above from the output of a spreadsheet I have made to work
out any thermochemistry problem (maybe our host would consider uploading it
to his website, I tried to post it to the list it didn't make it, probably
because the list doesn't like attachments)
Thats' 31 kJ per g of Al. The kind of energy used (thermal, electrical)
doesn't matter for energy balance of the reaction itself (enthalpy is a
state variable) but of course you must take into account efficiency of power
supply etc for particular process, which I wouldn't know.
Michel
----- Original Message -----
From: "john herman" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Tuesday, May 16, 2006 8:45 AM
Subject: Re: the aluminium batery
NB:
[1] aluminum is a great example of a light metal alkali.
[2] as exhausted the result will be aluminum oxide
[3] to reduce the oxide to the active metal will require work
.hence...
aluminum appears to be viable candidate... if reduction to metal can be
made cost effective.
Q: can any Vo let us know how much energy in the form of heat and
electric current is needed to reduce aluminum?
Presume the Hall process is used, please.
Q: More specifically how much energy as Electric current ...AND how much
as HEAT is required with the Hall fused salts aluminum process?
You are gracious persons to consider the question.
Herma
On 5/15/06, thomas malloy <[EMAIL PROTECTED]> wrote:
John Coviello posted;
I'll have to read up on this company and technology. The claims of
capacity are so great, that a natural amount of skepticism is very
warranted. If they can produce such an aluminum battery, I would assume
that it would not be very expensive, since aluminum is rather cheap.
We'll see if anything comes of this.
I read the company's prospectus. It's not just that the aluminum is
light and cheap, according to their graph, the proposed battery stores
way more energy per kilogram-. Another consideration is how many cycles
the battery can go through before it needs to be re manufactured. IMHO,
it is this factor which economically kills a hybrid. I don't recall this
matter being addressed
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