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Author: Subject: Cerium dioxide from ceric ammonium nitrate
vano
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[*] posted on 18-1-2022 at 09:45
Cerium dioxide from ceric ammonium nitrate


I just thermally decomposed ceric ammonium nitrate. I heated it at 200 C. then raised the temperature to 250-280 degrees and calcine it for another 2 hours.

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woelen
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[*] posted on 19-1-2022 at 10:57


How reactive is this CeO2? Can it be dissolved in acids? I have some CeO2, and that material is extremely inert and cannot be dissolved in concentrated acids, not even by boiling the acid. So, I am wondering how reactive your product is. I would like to have some CeO2, which is sufficiently reactive that it can be used to make other Ce-salts.



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Bedlasky
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[*] posted on 19-1-2022 at 13:30


Why did you make useless CeO2 from usefull ammonium cerium(IV) nitrate?

Woelen: https://www.sciencemadness.org/whisper/viewthread.php?tid=15...

I read that molten bisulfate should also dissolve CeO2.




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[*] posted on 20-1-2022 at 07:28


woelen i don't know to tell you truth. When i try i will write here.

Bedlasky i know how useful it is, but have a lot and i also want other cerium compounds for example tetravalent sulfate. Exept that i love when i have new reagent.




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Lion850
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[*] posted on 20-1-2022 at 21:42


Hi Woelen did you try hot concentrated sulphuric acid?

See my post

http://www.sciencemadness.org/talk/viewthread.php?tid=155085...

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[*] posted on 21-1-2022 at 01:16


I tried boiling HCl (30%), boiling H2SO4 (40% or so).

I did not try the really hot things like near boiling hot concentrated H2SO4 or molten NaHSO4 (the hydrate "melts" at 58 C, but that is no real melting, it just is losing water of crystallization and then dissolving in its own lost water of crystallization, real melting occurs well over 300 C).

I might try the hot H2SO4-route. The molten NaHSO4 seems too dangerous to me with glassware, and when using other materials, then you get a contaminated product (the cerium(IV) is strongly oxidizing and most likely will oxidize many metals).




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