These two patents give methods for producing Pd on charcoal.
US 4421676 Process for preparation of palladium on carbon catalysts used in the purification of crude terephthalic acid
US 6066589 Hydrogenation catalysts
Coconut charcoal is prefered for some reason.
I found something that says coal based C is superior to coconut charcoal at least for use in aquariums. Any thoughts about making Pd/C using aquarium
or water/air activated charcoal filtering media? Googling palladium and charcoal turns up a lot of articles and books about Pd/C hydrogenation
catalysts. Coconut charcoal is sold on Ebay.
Quote:
Heat-activated bituminous coal-based Black Diamond granules are specially sized and far more efficient than inferior coconut, wood or peat-based
carbons. Premium Black Diamond works as much as twice as fast as the competition.
[Edited on 7-9-2009 by Formula409]starman - 7-9-2009 at 18:28
Vogelzang- is there information on the mesh sizes of these aquarium type products?
F409- interesting read. I particularly like the use of nitrate salts, evaporation and the older method of simply heating to drive off NOx and
H2O.Probably also applicable to Pd.
Pd metal,charcol, nitric acid and a heat source.Much more home friendly than the methods I've encountered for Pd/C.Vogelzang - 8-9-2009 at 13:22
The mesh size varies from 4-5 mesh to smaller mesh. I found an interesting article today (attached).
There are numerous ways to make an active Pd/C. PdCl2 can be dissolved in a suitable organic solvent, or even chloropalladic acid can be used. Best
results with hot H2 as reductant, cooling under H2, and bottling that way.The most important consideration is the charcoal. I have found that
pellotised charcoals are good substrates if one is planning to reduce a lot of material and easily separate the catalyst for reuse.
If I had the spare time I would do a prepublication on Adams' and a suite of palladium catalysts. Klute - 9-9-2009 at 15:01
Damn! Can't wait for that! It would be a delightfull contribution! NERV told me a bit about your work with PtO2, very interesting! And all that from
scrap metal if I understood correctly?
Have you tried the H2 reduction method for Pd yourself? How active was the catalyst compared to commercial material?
Can't wait to hear some more!zed - 9-9-2009 at 20:19
Hmmmmm. Do you suppose coal based charcoal might contain sulfur compounds?crazyboy - 9-9-2009 at 20:52
Hmmmmm. Do you suppose coal based charcoal might contain sulfur compounds?
What is coal based charcoal and why would it be preferable to any other charcoal?Fleaker - 10-9-2009 at 03:11
Coal based charcoal is essentially coke.zed - 11-9-2009 at 21:29
There are often good reasons for using reagents of a specific origin. These materials work well for the job at hand..
Similar materials of a different origin, might not perform properly.
My query regarding possible residual Sulfur compounds, in coal based charcoal, had a purpose. Some catalysts are extremely sensitive to such
compounds. Your catalyst then, might be inadvertently "poisoned" by the trace elements in the coal-charcoal substrate. Thereby causing your
intended reduction, to completely fail.
Such screw ups are commonplace. watson.fawkes - 12-9-2009 at 06:16
If you just want to buy Pd/C, then you might try Artcraft. I bought some 10% Pd on C from them about a year ago for US$6 per gram.Waffles - 18-9-2009 at 08:48
I have a bunch of excess Pd/C, Engelhard material in original container I believe, give a U2U if you're interested. I could also trade for Pd raw
material if you already have some.UnintentionalChaos - 19-9-2009 at 17:13
Have a lookee there. Pd is fairly cheap, about $10/g at spot value. One gram would be enough for 20g of 5% Pd/C after dissolving in a little aqua
regia.
The coal based activated charcoals have higher surface area than the organic matter based ones, IIRC, which is a definite advantage for water
purification. However, they almost surely have residual sulfur compounds in them, and platinum group metals are highly sensitive to sulfur
contamination.Vogelzang - 20-9-2009 at 11:07
Hi i am looking to buy some Pd/C for a school project (rasberry ketone).
My source will be Acros but i have a few questions first. What difference does the % Pd make? I guess its just speed of hydrogenation but thats just a
guess. Also when it says 10g, is that 10g of the palladium and carbon together or just 10g of Palladium metal on carbon.
thanksgsd - 25-10-2009 at 09:50
Also when it says 10g, is that 10g of the palladium and carbon together or just 10g of Palladium metal on carbon.
thanks
It is Pd and C together making 10 gm.
gsd
[Edited on 25-10-2009 by gsd]Picric-A - 25-10-2009 at 10:26
awsome thanks,Vogelzang - 25-11-2009 at 16:21
This experiment gives a method of producing a supported Pt catalyst using sodium borohydride. I can't remember what book it comes out of.
Attachment: Ch16-CatHyd.pdf (227kB) This file has been downloaded 1056 times
ANDLOS - 18-12-2009 at 11:27
I want to ask how to handle pd/c after use is there any method for reuse after first time used in reduction to use it second time,
thanks alotentropy51 - 18-12-2009 at 11:34
One answer from Googling.ANDLOS - 18-12-2009 at 11:40
but this answer from trade source need money I mean if there is simple procedure for recycling that I can carry out entropy51 - 18-12-2009 at 15:31
I know, but when I worked in industry we never recycled hydrogenation catalysts. I once asked asked why not, because they were expensive. The Real
Chemists who ran the labs said it wasn't worth the trouble. Others here may know better, though.Nicodem - 19-12-2009 at 15:27
but this answer from trade source need money I mean if there is simple procedure for recycling that I can carry out
You might find the answer if you UTFSE. As far as I remember, this topic was already discussed and the regeneration processes for Pd-C were posted and
I think it was pretty simple.stoichiometric_steve - 20-12-2009 at 08:44
the regeneration processes for Pd-C were posted and I think it was pretty simple.
Oh yeah, it is. Wash your used catalyst with whatever organic solvent will take off the crap that you just processed, wash with dilute NaOH, wash off
the NaOH until pH=7, dry in plain air, and re-reduce it if necessary.Vogelzang - 27-12-2009 at 18:32
