nodrog19
Harmless
Posts: 38
Registered: 29-5-2008
Member Is Offline
Mood: No Mood
|
|
palladium electrodes, sodium bromate
Will palladium electrodes corrode or are they like platinum? I know that they store alot of hydrogen (500 times their volume).
Will NaBr+3O----->NaBrO3 work better in an acidic or basic environment?
[Edited on 23-6-2008 by nodrog19]
[Edited on 23-6-2008 by nodrog19]
|
|
|
Klute
International Hazard
Posts: 1378
Registered: 18-10-2006
Location: France
Member Is Offline
Mood: No Mood
|
|
I think the bromate electrolysis must be performed in basic conditions, otherwise you just form Br2.
\"You can battle with a demon, you can embrace a demon; what the hell can you do with a fucking spiritual computer?\"
-Alice Parr
|
|
|
garage chemist
chemical wizard
Posts: 1803
Registered: 16-8-2004
Location: Germany
Member Is Offline
Mood: No Mood
|
|
Palladium is unsuitable, it reacts with bromine.
Pd is the least noble of the platinum group metals and already dissolves in HNO3. It's a lot like silver.
Fortunately, a graphite anode works well for bromate production with very little erosion compared to chlorate production, as woelen has shown.
Do not add any acid or base to a bromate cell.
It produces its own base at the cathode, and bromine being liquid, not gaseous, will not escape as chlorine does, so there is no need to adjust the
pH.
If you add acid, you will get bromine only, and if you add base, you get oxygen at the anode.
|
|
|
nodrog19
Harmless
Posts: 38
Registered: 29-5-2008
Member Is Offline
Mood: No Mood
|
|
thanks
|
|
|
plante1999
International Hazard
Posts: 1936
Registered: 27-12-2010
Member Is Offline
Mood: Mad as a hatter
|
|
Does anyone have try palladium anode in a chloride to chlorate cell ? Palladium is suposed to react with chlorine at 500 degree C and platinum at 400
degree C.
Because I have a scource of piece witch contain 1% easily extractable palladium witch I could plate on a substate.
Thanks!!!
[Edited on 4-9-2011 by plante1999]
[Edited on 4-9-2011 by plante1999]
I never asked for this.
|
|
|
woelen
Super Administrator
Posts: 8012
Registered: 20-8-2005
Location: Netherlands
Member Is Offline
Mood: interested
|
|
No, palladium does NOT work, not at all. Your figure of 500 C is for dry chlorine gas over bulk palladium. Chlorine in aqueous solution is MUCH more
corrosive and the oxidative strain at the anode will be even more strong. You will simply see your palladium electrode dissolve and no (or hardly any)
Cl2 is formed at all.
|
|
|
![[*]](images/xpblue/default_icon.gif){kind=icon}
