Ceria particles with different specific surface areas (SSA) were contaminated with chloride and water, then heat treated at 500 and 900 °C to investigate sorption behaviour of these species on metal oxides. Results from x-ray photoelectron spectroscopy and infrared spectroscopy showed chloride and water adsorption onto particles increased with surface area and that these species were mostly removed on heat treatment (from 6.3 to 0.8 at% Cl^- on high SSA and from 1.4 to 0.4 at% on low SSA particles). X-ray diffraction revealed that chloride was not incorporated into the bulk ceria structure, but crystal size increased upon contamination. Ce L_III-edge x-ray absorption spectroscopy confirmed that chloride was not present in the first co-ordination sphere around Ce(IV) ions, so was not bonded to Ce as chloride in the bulk structure. Sintering of contaminated high SSA particles occurred with heat treatment at 900 °C, and they resembled low SSA particles synthesised at this temperature. Physical chloride-particle interactions were investigated using electron microscopy and energy dispersive x-ray analysis, showing that chloride was homogeneously distributed on ceria and that reduction of porosity did not trap surface-sorbed chloride inside the particles as surface area was reduced during sintering. This has implications for stabilisation of chloride-contaminated PuO₂ for long term storage.

具有不同比表面积（SSA）的二氧化铈颗粒被氯化物和水污染，然后在500和900°C进行热处理，以研究这些物质在金属氧化物上的吸附行为。从X射线光电子能谱法和红外线光谱表明氯化物和水吸附到颗粒的结果与表面面积增加，并且，这些物种在热处理％的Cl大多去除（从6.3到0.8 ^-原子％高SSA和从1.4至0.4在低SSA颗粒上）。X-射线衍射表明，氯化物未掺入到整个二氧化铈结构中，但晶体尺寸在受污染时增加。铈大号_III边X射线吸收光谱法证实，在Ce（IV）离子周围的第一个配位球中不存在氯化物，因此在本体结构中并未作为氯化物与Ce结合。在900°C的热处理下，发生了受污染的高SSA颗粒的烧结，并且类似于在此温度下合成的低SSA颗粒。使用电子显微镜和能量色散X射线分析法研究了物理氯化物与颗粒之间的相互作用，结果表明，氯化物均匀分布在二氧化铈上，并且由于烧结过程中表面积的减少，孔隙率的降低并未将表面吸附的氯化物截留在颗粒内。这对于长期储存的氯化物污染的PuO _2的稳定化具有影响。