Abstract Suspensions of cerium(IV) oxide (CeO 2 ) particles in molten chloride salts were found to be active for molecular oxygen activation when doped with the larger Lanthanides, gadolinium (Gd), praseodymium, (Pr), and samarium, (Sm). The activity for O 2 oxidation of gas phase CO on suspended doped ceria in molten mixtures of LiCl–LiBr–KBr and NaCl–KCl is significantly higher than undoped ceria or the salt mixtures alone in the temperature ranges of 350–600 °C, and 700–800 °C, respectively. Surface tension measurements show that the solid doped ceria particles suspended in the melt are contacting the gas–liquid interface of the bubbles. The activity for O 2 oxidation of liquid phase MgCl 2 in molten MgCl 2 –KCl to produce Cl 2 and solid MgO was also observed to be significantly increased on suspended CeO 2 doped with 5 wt% or 10 wt% Gd. The rates of oxidation were observed to increase with catalyst loading. Graphic Abstract

中文翻译：

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熔融氯化盐中悬浮掺杂的氧化铈 (IV) 颗粒的分子氧活化

摘要 当掺杂较大的镧系元素、钆 (Gd)、镨 (Pr) 和钐 (Sm) 时，熔融氯化物盐中的氧化铈 (IV) (CeO 2 ) 颗粒悬浮液对分子氧活化具有活性。 . 在 LiCl-LiBr-KBr 和 NaCl-KCl 的熔融混合物中悬浮掺杂的二氧化铈对气相 CO 的 O 2 氧化活性显着高于未掺杂的二氧化铈或单独的盐混合物在 350-600 °C 的温度范围内，并且分别为 700–800 °C。表面张力测量表明，悬浮在熔体中的固体掺杂二氧化铈颗粒与气泡的气液界面接触。O 2 氧化熔融MgCl 2 -KCl 中的液相MgCl 2 以产生Cl 2 和固体MgO 的活性也被观察到在掺杂有5 wt% 或10 wt% Gd 的悬浮CeO 2 上显着增加。观察到氧化速率随着催化剂负载的增加而增加。图形摘要