You introduce the peroxide to the catalyst, oxygen bubbles off slowly. You introduce hydrogen which combines with the oxygen raising the temperature. Would this temperature rise be enough to ensure accelerated decomposition? Most important for a flight vehical how little hydrogen would be needed to keep the reaction rapid?
BTW I liked the electrical properties section. I wonder if you could get derive a voltage reading from a milky exhaust plume to check on the reaction? Is this how an automotive oxygen sensor works?
Sniped from that exelent site
From the notes under *Self-accelerated decomposition graph*
2. The effect of temperature is such that an increase of 10 ^o C increases the rate of decomposition by a factor of 2.3 (i.e., a first order rate equation). Therefore, decomposition can accelerate if the solution becomes grossly contaminated.
3. As the concentration of H_2 O_2 in solution increases, there is less water to absorb the heat of decomposition. A crossover occurs at 63-64% H_2 O_2 where rapid, accelerated decomposition becomes self-sustaining and the concentration of H_2 O_2 in the decomposing solution can actually increase.
Earl Colby Pottinger wrote:
Try:
http://www.h2o2.com/intro/properties/physical.html and look at table 16
next:
http://www.h2o2.com/intro/properties/thermodynamic.html at table 5
combine to get table 9
You see that you need about 63% peroxide to convert all liquid to steam.
Earl Colby Pottinger
My idea was that the H2 would combine with the free oxygen createdfrom
the peroxide reacting with the catalyst. If it didn't ignite on it'sown
then you could spark ignite it. Perhaps a small auxillery chamber witha
small amount of catalyst and it's own H2O2 supply would be the placeto
inject the H2. This is not intended to boost power, but to add just enough energy to sustain the reaction using 50% H2O2. Perhaps if youget
the engine started this way it would self heat enough to cut out theH2.
I think it is the latent heat needed to boil off the water in the 50% H2O2 which is cooling and killing the rapid catalyst reaction. Onceyou
get the thing running hot enough to suck off some of the heat for regenerative heating I think you could get the engine to run. I am not able to calculate the heat released by the H2 and O reaction, but ifyou
do and it is higher than the amount of heat to boil off the extrawater
then you got an engine.that
John Carmack wrote:
At 11:21 AM 6/23/2003 -0400, you wrote:
Add a tad of H2 to the chamber to boost the temperature. Has this been tried?Replacing alcohol with hydrogen wouldn't increase temperature all
John Carmack wrote:
much, and hydrogen wouldn't catalytically burn on the catalyst like methanol does.--
John Carmack
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