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@ARTICLE{Schreinemachers:897246,
author = {Schreinemachers, Christian and Bollen, Olivier and
Leinders, Gregory and Tyrpekl, Václav and Modolo, Giuseppe
and Verwerft, Marc and Binnemans, Koen and Cardinaels,
Thomas},
title = {{H}ydrolysis of uranyl‐, {N}d‐, {C}e‐ions and their
mixtures by thermal decomposition of urea},
journal = {European journal of inorganic chemistry},
volume = {2022},
number = {4},
issn = {1099-0682},
address = {Weinheim},
publisher = {Wiley-VCH},
reportid = {FZJ-2021-03708},
pages = {ejic.202100453},
year = {2022},
abstract = {The hydrolysis of uranyl-, Nd- and Ce-cations, induced by
thermal decomposition of urea was investigated and the
impact of the urea content and the experiment temperature on
the reaction kinetics was evaluated. Uranyl precipitated as
ammonium diuranate (ADU) with varying stoichiometry. Nd(III)
and Ce(III) showed comparable pH evolutions and lanthanide
carbonate hydroxide (LnCO3OH) products were identified,
whereas Ce(IV) hydrolysed at lower pH and formed CeO2. The
precipitation behaviour was confirmed for mixtures of uranyl
and the lanthanides. Depending on the urea content, a
partial co-precipitation occurred in U/Nd mixtures. The
phases formed with Ce(III) and Ce(IV) were also identified
in the precipitates of binary U/Ce mixtures. In ternary
U/Nd/Ce compositions, a simultaneous precipitation of
Nd(III) and Ce(III) was observed and a partial incorporation
of the lanthanides into the ADU phase, whereas the
precipitation in the presence of Ce(IV)/CeO2 led to the
formation of three individual phases.},
cin = {IEK-6},
ddc = {540},
cid = {I:(DE-Juel1)IEK-6-20101013},
pnm = {1411 - Nuclear Waste Disposal (POF4-141)},
pid = {G:(DE-HGF)POF4-1411},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000714111900001},
doi = {10.1002/ejic.202100453},
url = {https://juser.fz-juelich.de/record/897246},
}