Date: Tue, 18 Feb 2003 16:36:18 -0500 (EST)
Subject: Re: Alternate fuels ( was: . . . in pieces on the ground )
From: "Kristopher Barrett" <kbarrett-AT-cotse.com>


> on 2/16/03 10:06 AM, Kristopher Barrett at kbarrett-AT-cotse.com wrote:
>
>> Methane can be made at nearly no energy cost by
>> running hydrogen and carbon dioxide through a catalyst, which would
>> deal with the bulk problem in using hydrogen.
>
>     Where does the hydrogen and carbon dioxide come from? How is it
> manufactured? How does it get from source to your vehicle? How is it
> stored in your vehicle? How far can you travel between fill-ups? How
> long does the engine last on this fuel source?

I didn't claim such. I was advocating the use of methane as fuel instead
of expensive and experimental systems involving in trying to get the bulk
of H2 down. Which is exactly what I said.

Converting H2 + CO2 to CH4 via the Sabatier process requires no energy input.

CO2 can either be extracted at an energy-cost from the atmosphere (
preferable solution ), or made on the spot via oxidation of any carbon
compound ( less preferable, adds greenhouse gasses instead of using them
up ).

Cracking H2 is where the big energy cost comes from... But at no place did
I suggest that getting H2 was free.


My original post did not claim that other portins of the process of
fueling vehicles was going to be enrgy-cost free. If you wish to
criticize, then please consider critizing what I wrote, not what you think
I wrote.


-- 
Regards,
Kristopher Barrett    http://www.cotse.net/users/kbarrett