RogueRose - 17-12-2015 at 05:38
I need to get some Pt for some reactions and have only found wires and "rods" and it seems that the prices don't really match that of market price for
pure Pt.
So, I'm wondering if it is possible to plate some metal like some expanded mesh of some material (steel, Al, copper, etc) with some pure Pt
filings/trimmings.
I think I can obtain these trimmings/filings locally for very close to market price. The only thing is that I know I don't currently have the ability
to form it into wire or rod - so if there is some other means of using the Pt like plating it onto a metal (or ceramic??) substrate I would be really
interested in hearing and happy to offer the finished product to other members for whatever it costs me to make.
Bert - 17-12-2015 at 05:55
Google is your friend!
http://www.sciencemadness.org/talk/viewthread.php?tid=8768
For best recommendation, you would need to disclose reaction you want this Pt plated catalyst material for.
Platinized mesh, glass/mineral wool, sintered porous ceramic or Carbon granules have been used in my experience, lots of options. If your reaction
will be poisoned by or destroy the catalyst substrate chemically or mechanically... You need to choose a different substrate.
Heavy Walter - 17-12-2015 at 05:59
Hi
Can you comment on the phases involved in your reactions?
Platinum black is commonly used as catalyst and there are many detailed procedures to prepare it on the web.
Combustion of methanol in air proceed with a platinum wire.
In case of preparing a surface or deposit on ceramic I would start with some salt, as platinum chloride, p.a.
Regards,
RogueRose - 17-12-2015 at 08:28
Thanks for the replies! I have searched many times regarding the reactions I was looking at and most of the time a "platinum" or Pt catalyst is
mentioned. In my ignorance of how the catalyst acts, I assumed that they all acted the same way and were all usable in the same form.
I really don't have a list of all the different reactions I have seen that use Pt as a catalyst, many of which I want to try, I was going to aquire
some to use when I want to do various experiments.
I'll have to make a list of some of the processes which I was looking at.
Hydrogenation of oils
Urea to Ammonia
Many others...
zed - 17-12-2015 at 17:36
Ummmm. I don't know much, but in liquid phase hydrogenations, Platinum Catalysts, are usually produced as needed. Freshly prepared catalysts are
generally the most active.
One precursor, Adam's Catalyst, is Platinum Oxide. You just put a little Platinum Oxide powder, into a suitable solvent, flush out the regular
atmosphere, and shake or stir, under a Hydrogen Atmosphere.....Pretty quick, the Platinum Oxide has been reduced to Pt +H2O and you are good to go.
My favorite start up, is via Chloroplatinic Acid. Dissolve some in Ethanol, squirt it into a stirred solution of Sodium Borohydride in Ethanol. The
Chloroplatinic Acid is instantly reduced to a very finely divided, very active, Platinum Hydrogenation Catalyst. NaBH4 seems to be fairly available
now, at reasonable prices.
Either of the starting materials can be produced from Platinum wire or scrap, or from bullion. Currently about 30 buck per gram, via E-bay.
Preliminary conversion to Pt Oxide or Chloroplatinic Acid, is usually via dissolving the native Platinum in Aqua Regia.
https://en.wikipedia.org/wiki/Adams's_catalyst
Whole field of study out there on catalyst preparation. Seems to me Wiley offers a lot of information on-line, in a book on the subject. Well, they
used to, at any rate.
http://www.sciencedirect.com/science/article/pii/S0040402001...
Browns original papers, are humdingers. Sadly, they are not easily accessible, on-line. Leastways, not for free.
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