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Registered Member #4181
Joined: Thu Nov 03 2011, 02:39PM
Location:
Posts: 42
whats wrong wiht using silver catalyst?
Well I can tell you that the far more expencive KI is going to produce a more a more rapid reaction, simply becasue of its soluabality, manganese dioxide is not as likely to be as rapid, but should have the same pressure resault, if you just looking for pressure, a sliver mesh will also produce a simular effect on consentrated H2O2 without the comsumption of the catalyst.
Registered Member #4201
Joined: Wed Nov 09 2011, 07:42AM
Location:
Posts: 20
thanks for helping out! :)
The problem is that my country only allows me to buy 3% hydrogen peroxide. so i have to concentrate it on my own. Using silver wire mesh as catalyst will be awesome but it requires hydrogen peroxide to be of high concentration.
I dont think i am allowed to concentrate it till become HTP in my school... perhaps the highest is around 20-30%.
I just want to produce pressure of above 10-20psi and i will be supeerr duper happy.
Registered Member #49
Joined: Thu Feb 09 2006, 04:05AM
Location: Bigass Pile of Penguins
Posts: 362
I played with this maybe 10 years ago. For goofying around with 3% you'll have a hard time finding anything better than potassium permanganate in terms of the reaction rate. The good and bad news is that its soluble... good because dissolving into the peroxide means surface area isn't a problem, but bad because your exhaust becomes purple and poisonous... and you eventually run out of catalyst.
Permanganate powder bonded together with epoxy made a passable catalyst so long as the epoxy concentration isn't too high - the epoxy moderates the amount of permanganate exposed to the H2O2 which helps it last longer. You want enough peoxy to provide mechanical strength but not so much as to fully encapsulate each grain of powder.
If I recall correctly I thought the permanganate was about twice as effective as manganese dioxide pulled out of D-cell batteries... but I wasn't measuring pressure, only subjective measuring rate.
You can also try oxioreductase - beef liver from the supermarket smashed up with a rolling pin or (better) a blender will do nicely.
Registered Member #4201
Joined: Wed Nov 09 2011, 07:42AM
Location:
Posts: 20
AndrewM wrote ...
Permanganate powder bonded together with epoxy made a passable catalyst so long as the epoxy concentration isn't too high - the epoxy moderates the amount of permanganate exposed to the H2O2 which helps it last longer. You want enough peoxy to provide mechanical strength but not so much as to fully encapsulate each grain of powder.
hmm do you mind explaining to me what do you mean by epoxy?? what is epoxy? sorry :X
Registered Member #96
Joined: Thu Feb 09 2006, 05:37PM
Location: CI, Earth
Posts: 4059
Epoxy as in Araldite. I use it all the time as it is mostly transparent and non conductive.
Kudos to AndrewM, I wasn't aware of this technique for encapsulating a catalyst.. maybe I can try this for my homemade supercapacitors but replace catalyst with carbon black and AC.
Would have thought that the trick here is to keep the epoxy cold to stop it fully mixing with the catalyst?
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Hydrogen Peroxide & Catalyst
