[Noisebridge-discuss] chemistry - extracting platinum from cat alytic converter "honeycomb" - how?
joelja at bogus.com
Sat Jan 22 20:57:40 PST 2011
On 1/22/11 7:33 PM, Patrick Keys wrote:
> anybody know how to extract the platinum from a catalytic converter
> "honeycomb"? california emission standards require special catalytic
> converters that have (theoretically) between .1 ounces and .2 ounces of
in a car it's like 3 grams or less which is at the bottom end of your
> platinum. the platinum "honeycomb" is the catalyst that burns the
> emissions to meet the high california emission standards.
> long story short, i had to get a new catalytic converter. usually, the
> place you buy the new catalytic converter requires you give them the old
> one to off-set the high cost of the rare earth elements. california law
> requires deep engraving of giant special serial numbers on all new
> catalytic converters to track which ones have been tested as "california
> approved". i was able to keep the old one because the previous one was
> bought out of state.
> if anybody knows how to get the platinum from the old catalytic
> converter, I'll bring it up to noisebridge. we can make a video and put
> it on youtube.
aqua regia will disolve platnium group metals at which point ammonium
chloride will precipitate it. but I wouldn't recomend doing that at
noisebridige at least not with a quantity of acid necessary to submerge
the commercial process uses cyanide leaching.
> Here's another video I found that explains the value of platinum in
> catalytic converters (seriously):
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