encipher
Harmless
Posts: 38
Registered: 15-12-2006
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Chromatography
Hi,
The place my friend works has a silica material with an iron core that it sells for industrial chromatography. The idea is to make a slurry of the
silica/iron, adsorb the desired specie on the silica and then gather the silica between two magnets as the slurry is pumped through a pipe. The trick
is to completely encapsulate the iron so it doesn't come into contact with anything. They do this with silica and then modify the outer surface to get
the chromatographic properties.
Is this possible to do with ferofluids? The goal would be to make a 2-4 micron particle covered with platinum or palladium. Slurry based industrial
hydrogenation catalyst systems typically use 5-20 micron based Pt or Pd catalysts. They separate the catalyst by settle/decant or filtration. Using
magnetic separation should allow smaller particles with increased geometric surface area; hence, increased reaction rate. It could also improve
selectivity, too.
The hydrogenation conditions are usually mild - organic solvents up to 5 atm and 300 C.
Any ideas?
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12AX7
Post Harlot
Posts: 4803
Registered: 8-3-2005
Location: oscillating
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Mood: informative
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Is there a silver plating formula that works with Pt or Pd?
Alternately, I recall there is some magnetic platinum compound (with reasonably qualities, but not used for obvious reasons). A hard magnet would be
less useful than a soft one, though.
For instance: http://www.nature.com/nature/journal/v216/n5111/abs/216149a0...
Pt-Fe or Pt-Ni may also be magnetic and catalytic in useful ways.
But I'm sure industry already knows this, tried it and failed for some reason (I don't know what reason that would be, though).
Tim
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