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cerium(iv) is a strong oxidant under acidic conditions, but stable under alkaline conditions, when it is cerium(iii) that becomes a strong reductant, easily oxidized by atmospheric oxygen (o2).
* de cerium(iv)oxide-cerium(iii)oxide-cyclus of ceo2/ce2o3 cyclus is een tweestappencyclus om op thermochemische wijze water te splitsen voor waterstofproductie.