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Topic: Palladium content estimation method  (Read 3357 times)

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Offline curiouscat

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Palladium content estimation method
« on: June 05, 2014, 11:09:17 AM »
What's a good method to estimate the Pd metal content of spend Pd-catalyst (Pd on C)?

ICP comes to mind, but are there other alternatives? Say a wet lab method?

Offline discodermolide

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Offline curiouscat

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Re: Palladium content estimation method
« Reply #2 on: June 05, 2014, 12:10:31 PM »
Thanks disco. That might be worth a shot.

What'd be a good way to bring Pd into solution? They in the paper start with Palladium chloride which is too easy.

HCl  alone won't bringing Pd into solution I suppose. I'm thinking spent catalyst >  a water wash > filter > muffle furnace > HCl + H2O2 + heat > filter?

Other ideas?

Offline Arkcon

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Re: Palladium content estimation method
« Reply #3 on: June 05, 2014, 12:30:01 PM »
I think to get platinum metals into solution, you will need to dance with, as Pete Townsend would say, the Gypsy -- The Acid Queen, that is to say aqua regia.  That was always fun for me, back in the day.
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Offline Enthalpy

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Re: Palladium content estimation method
« Reply #4 on: June 05, 2014, 04:35:07 PM »
Would a liquid metal dissolve palladium and leave graphite? It's done with mercury for gold, maybe a hotter liquid metal would with palladium - whose boiling point is only 100K hotter. Liquid gallium alloys, lead, tin...

Offline Enthalpy

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Re: Palladium content estimation method
« Reply #5 on: June 05, 2014, 05:08:31 PM »
I see palladium thickness like 10nm on the web. How slowly would a banal acid dissolve it?

Offline Catalysaurus Rex

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Re: Palladium content estimation method
« Reply #6 on: June 06, 2014, 01:08:51 PM »
I've used ICP-OES for analyzing Pd in catalyst samples (after digestion with either HF or aqua regia overnight) and it usually works. The issue here is the carbon support - I recently tried both HF and aqua regia with a similar catalyst (Pt/C) and it didn't work well. The digestion was most likely incomplete and the work-up of the resulting suspension was very troublesome. I suppose that these problems can be avoided by ashing the sample first, but that part I've not tried yet.
« Last Edit: June 06, 2014, 01:19:57 PM by Catalysaurus Rex »

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